Full-degradable sports shoes

Abstract

The invention provides a full-degradable sports shoe. A vamp comprises a shoelace, a foam shoe tongue, vamp mesh cloth, in-shoe foam and shoe lining cloth; the insole comprises insole cloth and insole foam; the sole comprises a midsole, an outsole and a supporting plate; an upper supporting strip is arranged at the junction of the sole and the upper; the outsole, the midsole, the supporting plate, the vamp mesh cloth and the like are bonded and formed through biodegradable glue; yarns used by the vamp and the insole cloth are at least one of PLA (Polylactic Acid), degradable polyester and polycaprolactone yarns; the vamp and the insole are made of foaming materials, the insole is made of a supercritical PBAT material, and the outsole is made of a bio-based polyester rubber material; the upper supporting strip is made of at least one or a blend of two or more of PLA, PBAT, PBS and PHA; and the upper supporting strip is externally arranged around the sole. Through the specific material selection of the whole shoe component and the mutual matching form of the components, the daily use performance of sports shoes is met, and the degradation rate of the whole shoe in 180 days in a compost treatment scene can be 80% or above.

Description

Technical Field

[0001] The present invention belongs to the technical field of shoe materials, and particularly relates to a fully degradable sports shoe. Background Art

[0002] In recent years, the increasingly deteriorating global natural environment has gradually made people aware of the importance of environmental protection. The concept of harmonious development among enterprises, society, and nature has taken root in people's hearts, and many industrial and daily necessities fields are developing towards a more environmentally friendly and sustainable direction. In the field of shoes, there are also a small number of environmentally friendly shoes that can be naturally degraded after being discarded to avoid secondary pollution. However, the current subdivided categories of environmentally friendly shoes mostly focus on ordinary shoe uses such as slippers, sandals, and casual shoes, or only some parts such as the shoe upper and shoelaces of the shoes are degradable. However, due to performance considerations, there are few achievements in degradable shoes for sports shoes or running shoes.

[0003] The main reason is that sports shoes or running shoes have requirements for shock absorption and wear resistance based on the sports scenario. Therefore, sports shoes and running shoes involve more components and more complicated processing methods compared to other categories of shoes. For example, sports shoes or running shoes mostly use the midsole structure to achieve shock absorption and the outsole to achieve good wear resistance and other performances. The midsole usually uses foaming materials, and both the foaming process and the molding process of the foaming materials require high-temperature heating. Similarly, processes such as crosslinking, vulcanization, and molding of the outsole structure also require high temperatures.

[0004] This also makes it impossible for the commonly used degradable natural rubber on the market to play a degradable role when used as the sole material of sports shoes. The reason is that there are active microorganisms in natural rubber, and the active microorganisms are the reason for the degradability of natural rubber. However, a large number of active microorganisms will be destroyed under the heating processing conditions. If the degradable natural rubber is directly used without heating, the strength will be very low and the wear resistance will be poor due to non-crosslinking, and it cannot meet the wearing use, especially cannot meet the use in the sports scenario. Therefore, the specific degradation performance of some materials claimed to be degradable after processing is not disclosed.

[0005] For another example: between the components of existing sports shoes or running shoes, especially between the midsole and the outsole, high-viscosity adhesives are required for bonding, and high-viscosity adhesives are often difficult to degrade.

[0006] For the remaining components of sports shoes or running shoes, such as shoe support plates, shoe insoles, etc., it is also not easy to degrade due to various reasons. These many reasons make it more difficult to achieve the degradation of the whole sports shoes or running shoes.

[0007] Therefore, providing a sports shoe that simultaneously meets the sports needs and the needs of the whole shoe to be degradable is of great significance for the entire civilian shoe products to move towards a more environmentally friendly and sustainable development direction. Summary of the Invention

[0008] In view of the problem that the sole of a sports shoe in the prior art cannot simultaneously meet the requirements of degradability and mechanical properties such as wear resistance, dry and wet skid resistance, and tear strength, the present invention provides a fully degradable shoe.

[0009] The technical solution of the present invention is as follows: A fully degradable sports shoe includes a shoe upper, an insole, and a sole. The shoe upper includes shoelaces, a foam tongue, a mesh fabric, inner foam, and an inner lining fabric; the insole includes an insole fabric and insole foam; the sole includes a midsole, an outsole, and a support plate; a vamp support strip is provided at the junction of the sole and the shoe upper; the outsole and the midsole, the support plate and the midsole or outsole, the shoe upper bottom and the midsole or support plate, the mesh fabric of the shoe upper and the vamp support strip, and the insole fabric and insole foam are adhesively formed by a biodegradable glue;

[0010] The yarns used for the shoe upper and the insole fabric are at least one of polylactic acid yarn, degradable polyester yarn, and polycaprolactone yarn; the foaming materials used for the shoe upper and the insole foam, and the midsole material of the shoe are supercritical PBAT materials, and the outsole of the shoe is a bio-based polyester rubber material;

[0011] The material of the vamp support strip is at least one of PLA, PBAT, PBS, and PHA or a blend of two or more of them; the vamp support strip is provided around the sole. Besides playing the role of fixing the mesh fabric of the shoe upper and the sole, its high tensile strength, elongation, and flexural strength effectively complement the corresponding properties of the sole.

[0012] Further, the foaming materials used for the inner foam and the foam tongue in the shoe upper are PBAT supercritical foaming materials, and their physical properties are: hardness 25 - 45C, density 0.12 - 0.18g / cm 3 , tensile strength 1.2 - 1.8MPa, 180-degree tear 1.5 - 3.0kg / cm, 90-degree tear 12 - 18kg / cm, energy return 60 - 75%.

[0013] Further, the mesh fabric of the shoe upper is woven from PLA or degradable polyester yarn, and its performance meets the requirements: tensile force > 40kg, tear > 13kg, burst > 23kg, normal temperature bending > 100,000 times, low temperature bending > 40,000 times, phenol yellow resistance and yellowing resistance are 4 - 5 levels.

[0014] Further, the physical properties of the vamp support strip are: hardness 40 - 60D, density 1.25 - 1.35g / cm 3 , tensile strength 15 - 30MPa, elongation 700 - 1500%, flexural strength 10 - 20MPa; flexural modulus 200 - 500MPa.

[0015] Further, the insole foam material is a supercritical PBAT material, with a density of 0.08 - 0.12g / cm 3 , hardness 25 - 35C, energy return 70 - 75%.

[0016] Further, for the fully biodegradable sports shoes according to claim 1, it is characterized in that: the midsole is made of supercritical foamed PBAT material with a density of 0.12 - 0.18 g / cm 3 , a hardness of 35C - 45C, a tensile strength of 1.2 - 1.8 MPa, a 180-degree tear of 2.5 - 4.0 kg / cm, a 90-degree tear of 15 - 20 kg / cm, and an energy return of 65 - 73%.

[0017] Further, the outsole is made of bio-based polyester rubber material. After cross-linking processing, its performance meets the following requirements: a hardness of 65 - 75A, a density of 1.25 - 1.35 g / cm 3 , a tensile strength of 10 - 12 MPa, a 90-degree tear of 50 - 60 kg / cm, an elongation at break of 250 - 600%, a DIN abrasion of 80 - 180 mm 3 , an Akron abrasion of 0.25 - 0.4 cm 3 , a wear scar length of 4 - 6 cm, a yellowing resistance of grade 4, an aging resistance of grade 4, and passing the ozone resistance test without cracking.

[0018] Further, the support plate is arranged between the midsole and / or between the midsole and the outsole. The support plate is made of a biodegradable epoxy resin composite material, which is composed of plant fibers or carbon fibers + biodegradable epoxy resin; the proportion of the biodegradable epoxy resin is 40 - 80%, the overall thickness of the support plate is 0.8 - 2 mm, and it includes a total of 4 - 8 fiber plies.

[0019] Preferably, the support plate includes a first support plate and a second support plate, and the midsole of the shoe includes a first midsole and a second midsole; the first support plate is arranged between the first midsole and the second midsole; the second support plate is arranged under the midsole and is connected to the outsole; the first support plate runs through the front and rear parts of the sole as a whole, and its area is smaller than that of the first midsole; the second support plate includes an inwardly curved suspended area and a pressure-bearing area directly connected to the outsole. The inwardly curved suspended area runs through from the front part of the sole to the rear part of the sole, increasing the specific surface area of the entire second support plate; when the inwardly curved suspended area is subjected to the downward pressure of the arch of the foot, it produces elastic deformation, strengthening the resilience of the sole and further providing the sole support force.

[0020] Further, the inner surface and part of the outer surface of the support plate are matte-treated to increase the surface roughness, which is convenient for increasing the attachment surface area of microorganisms during industrial composting and improving the degradation efficiency.

[0021] Preferably, the biodegradable glue is copolymerized from the following monomers: adipic acid, 1,4-butanediol, 1,4-cyclohexanedimethanol, and 1,4-butenediol. The mass ratio of the four monomers is adipic acid:1,4-butanediol:1,4-cyclohexanedimethanol:1,4-butenediol = 100:40:40:20.

[0022] Furthermore, the performance of the support plate meets the following requirements: hardness 70 - 85D, density 1.30 - 1.80 g / cm 3 , tensile strength 5 - 20 GPa, elongation at break 0.5 - 2%, flexural strength 5 - 20 GPa; flexural modulus 10 - 50 GPa.

[0023] Through the selection of specific materials or components of the overall shoe components and the mutual cooperation of the structures of each component, the present invention designs a fully degradable sports shoe, which can not only meet the daily use performance of sports shoes, but also meet the degradation effect that the degradation rate of the whole shoe is more than 80% within 180 days in the composting treatment scenario.

[0024] The improvement method is different from the complex modification or processing technology improvement of only a certain part of the materials of sports shoes in the prior art, which only obtains a certain degradable and performance-sufficient component; instead, on the premise of meeting degradability, it pays attention to the selection of the materials or components of each shoe component, and jointly adjusts the component structure and the cooperation form between components; to solve the problem of balancing the degradability and use performance of sports shoes in a simpler and easier-to-industrialize way. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the sole structure of a fully degradable shoe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] A fully degradable shoe provided by the present invention includes a shoe upper, an insole and a sole. Among them, the shoe upper includes shoelaces, a foam tongue, a shoe upper mesh, inner shoe foam, shoe lining cloth, etc.; the insole includes an insole cloth and insole foam; the sole includes a midsole, an outsole and a support plate. A vamp support strip is provided at the junction of the sole and the shoe upper. The outsole and the midsole, the support plate and the midsole or outsole, the shoe upper and the midsole or support plate, the shoe upper mesh and the vamp support strip, the insole cloth and the insole foam are adhesively formed by a biodegradable glue.

[0028] Specifically, the shoelaces, woven labels, shoe lining cloth, etc. are woven with any one of polylactic acid (PLA) yarn, degradable polyester yarn, and polycaprolactone (PCL) yarn. The performance of the above yarns needs to meet the following requirements: tensile force > 40 kg, phenol yellow resistance and yellowing resistance are 4 - 5 levels.

[0029] The insole foam and the foam tongue are made of polybutylene adipate terephthalate (PBAT) supercritical foaming material. The physical properties of the foaming material are as follows: hardness 25 - 45C, density 0.12 - 0.18g / cm 3 , tensile strength 1.2 - 1.8MPa, 180-degree tear 1.5 - 3.0kg / cm, 90-degree tear 12 - 18kg / cm, energy return 60 - 75%.

[0030] The upper mesh fabric is woven from polylactic acid (PLA) or degradable polyester yarns, and its properties are as follows: tensile force > 40kg, tear > 13kg, burst > 23kg, normal temperature bending > 100,000 times, low temperature bending > 40,000 times, phenol yellow resistance and yellowing resistance are grade 4 - 5.

[0031] The material of the vamp support strip is at least one or a blend of two or more of PLA, PBAT, PBS, and PHA. The physical properties are: hardness 40 - 60D, density 1.25 - 1.35g / cm 3 , tensile strength 15 - 30MPa, elongation at break 700 - 1500%, flexural strength 10 - 20MPa; flexural modulus 200 - 500MPa.

[0032] The vamp support strip of the present invention is provided outside the sole around the sole. In addition to playing a role in fixing the connection between the upper mesh fabric and the sole, its high tensile strength, elongation at break, and flexural strength effectively complement the corresponding properties of the sole.

[0033] The insole foaming material is supercritical PBAT material, density 0.08 - 0.12g / cm 3 , hardness 25 - 35C, energy return 70 - 75%. The insole cloth is woven from PLA yarns.

[0034] The midsole is made of supercritical foamed PBAT (polybutylene adipate terephthalate) material. After foaming, the density is 0.12 - 0.18g / cm 3 , hardness 35C - 45C, tensile strength 1.2 - 1.8MPa, 180-degree tear 2.5 - 4.0kg / cm, 90-degree tear 15 - 20kg / cm, energy return 65 - 73%.

[0035] In the PBAT material, the soft segment is composed of aliphatic butylene adipate, so it is easier to degrade and can be decomposed by microorganisms in the soil into carbon dioxide and water. Due to the semi-crystalline nature of PBAT (the crystallinity is about 30% approximately), its foaming performance is weak. Therefore, the conventional uses of PBAT are for films, packaging bags, etc.; in the shoe-making field, it is mostly added in small amounts. If PBAT is only applied to the supercritical foaming process in a conventional way, the tear and tensile strength of the resulting product will be lower than that of the commonly used non-degradable EVA midsole. Therefore, even in environmentally friendly shoe-making materials, PBAT is basically not used as the main material for foaming; or ways such as blending, adjusting the type of additives, and changing the foaming process are needed to improve the performance of its final product.

[0036] In the present invention, the limitation on the performance of the supercritical foamed PBAT material for the midsole refers to the performance range that can be achieved under conventional processes and conventional additives (such as antioxidants, nucleating agents, etc.). The purpose of the present invention is not limited to whether the performance of a single component reaches the general performance in the industry, but focuses on meeting the overall use performance in the whole shoe product. For a single component, on the premise of giving priority to meeting degradability, the deficiency in the performance of a single component can be compensated by cooperating with other components. In the present invention, the lack of tensile performance of the shoe midsole is compensated by the vamp support strip provided outside the midsole, and the support performance (i.e., compensating for the lack of hardness of the shoe midsole) and the resilience (i.e., the performance in terms of force feedback, including the energy return index) are strengthened by the support plate component.

[0037] The outsole of the shoe is made of a bio-based polyester rubber material. After cross-linking processing, its performance meets the requirements of hardness 65 - 75A, density 1.25 - 1.35 g / cm 3 , tensile strength 10 - 12 MPa, 90-degree tear 50 - 60 kg / cm, elongation at break 250 - 600%, DIN abrasion 80 - 180 mm 3 , Akron abrasion 0.25 - 0.4 cm 3 , abrasion mark length 4 - 6 cm, yellowing resistance grade 4, aging grade 4, ozone resistance qualified without cracking.

[0038] The support plate of the present invention is disposed between the midsole and / or between the midsole and the outsole. The support plate is made of a biodegradable epoxy resin composite material, which is composed of plant fibers or carbon fibers + biodegradable epoxy resin. The biodegradable epoxy resin refers to a biodegradable epoxy resin in which the curing agent used is a cyclic peptide diol containing a natural amino acid structure and the main chain structure contains an amide bond. The reason for using this biodegradable epoxy resin is that compared with the materials such as PLA, PBAT, and PHA that can meet biodegradation, and the common non-degradable support plates for shoes (TPU, PA materials), the strength and modulus are both lower. The biodegradable epoxy resin composite material of the present invention, through the selection of the curing agent and the main chain structure groups therein, the cyclic peptide diol and the amide bond are crosslinked, and on the basis of meeting the strength, the biodegradability of the epoxy resin is enhanced.

[0039] In the support plate made of the above biodegradable epoxy resin composite material, the proportion of the biodegradable epoxy resin is 40-80%, the overall thickness of the support plate is 0.8-2 mm, and a total of 4-8 layers of fiber plies are provided. In this way, on the premise of meeting biodegradability, the performance of the support plate can reach: hardness 70-85D, density 1.30-1.80 g / cm 3 , tensile strength 5-20 GPa, elongation at break 0.5-2%, flexural strength 5-20 GPa; flexural modulus 10-50 GPa. The setting of the support plate enhances the overall resilience and support performance of the sole.

[0040] Preferably, the inner surface and part of the outer surface of the support plate are matte-treated to increase the surface roughness, so as to increase the attachment surface area of microorganisms during industrial composting and improve the degradation efficiency.

[0041] The biodegradable glue is copolymerized from the following monomers: adipic acid (AA), 1,4-butanediol (BDO), 1,4-cyclohexanedimethanol (CHDM) and 1,4-butenediol (BEDO). The optimal feeding ratio of the four monomers is AA:BDO:CHDM:BEDO = 100:40:40:20. Among them, adipic acid provides carboxylic acid groups, forms a polyester main chain with diols, and endows the glue with biodegradability and polarity; 1,4-butanediol is a saturated straight-chain diol, which enhances flexibility and elongation at break. 1,4-cyclohexanedimethanol has a rigid cyclic structure, which can improve the thermal stability and mechanical strength of the glue; 1,4-butenediol contains an unsaturated double bond, which can be used as a reaction site to support ultraviolet curing, sulfur vulcanization or chemical crosslinking; therefore, the glue achieves a high bonding ability on the basis of biodegradability.

[0042] Example 1

[0043] A fully degradable sports shoe, and the shoe components from top to bottom are:

[0044] Upper part: including shoelaces, foam tongue, upper mesh, insole foam, shoe lining; the upper part can be provided with woven labels according to circumstances.

[0045] Among them, the shoelaces, upper mesh, shoe lining, and woven labels are woven from polylactic acid (PLA) or biodegradable polyester or polycaprolactone (PCL) yarns, and the performance of the used yarns meets the following requirements: tensile strength > 40 kg, phenol yellow resistance and yellowing resistance are grades 4 - 5. For the overall performance of the woven upper mesh, it meets the following requirements: tear resistance strength > 13 kg, burst strength > 23 kg, normal temperature bending times > 100,000 times, low temperature bending times > 40,000 times.

[0046] The insole foam and inner foam are foamed with polybutylene adipate / terephthalate (PBAT) material, and the required performance meets the following requirements: hardness 25 - 45C, density 0.12 - 0.18 g / cm 3 , tensile strength 1.2 - 1.8 MPa, 180 - degree tear 1.5 - 3.0 kg / cm, 90 - degree tear 12 - 18 kg / cm, energy return 60 - 80%.

[0047] Sole part: including vamp support strip, insole, midsole, support plate, outsole.

[0048] The material of the vamp support strip is at least one or a blend of two or more of PLA, PBAT, PBS, PHA, and its performance meets the following requirements: hardness 40 - 60D, density 1.25 - 1.35 g / cm 3 , tensile strength 15 - 30 MPa, elongation at break 700 - 1500%, flexural strength 10 - 20 MPa; flexural modulus 200 - 500 MPa.

[0049] For the insole, the insole fabric part is woven from PLA yarn, and the foaming material inside the insole is supercritical PBAT material, and the performance of the foaming material meets the following requirements: density 0.08 - 0.12 g / cm 3 , hardness 25 - 35C, energy return 70 - 75%.

[0050] The midsole is made of supercritical foamed PBAT material, and its performance meets the following requirements: density 0.12 - 0.18 g / cm 3 , hardness 35C - 45C, tensile strength 1.2 - 1.8 MPa, 180 - degree tear 2.5 - 4.0 kg / cm, 90 - degree tear 15 - 20 kg / cm, energy return 65 - 73%.

[0051] The support plate is made of biodegradable epoxy resin composite material, the resin proportion is 40 - 80%, the thickness of the support plate is 0.8 - 2 mm, and there are 4 - 8 layers of fiber plies. Its performance meets the following requirements: hardness 70 - 85D, density 1.30 - 1.80 g / cm 3, the tensile strength is 5 - 20 GPa, the elongation at break is 0.5 - 2%, and the flexural strength is 5 - 20 GPa; the flexural modulus is 10 - 50 GPa.

[0052] The midsole of the shoe is divided into upper and lower parts, and the support plate is also divided into upper and lower layers. As Figure 1 shown, the midsole of the shoe includes: the first midsole 1 and the second midsole 3; the first support plate 2 is arranged between the first midsole 1 and the second midsole 3; the second support plate 4 is arranged below the midsole 3 and is connected to the outsole (not shown in the figure); the area of the first support plate 2 runs through the front and rear parts of the sole as a whole, and the area is smaller than that of the first midsole 1; the material is preferably 80 - 90A in hardness, and the main purpose is to provide sufficient support force for the sole.

[0053] The second support plate 4 includes a suspended area with an inward curvature and a bearing area directly connected to the outsole. The suspended area with an inward curvature runs through from the front part of the sole to the rear part of the sole; when the suspended area with an inward curvature is subjected to the downward pressure of the arch of the foot, it produces elastic deformation, strengthening the resilience of the sole and further providing the support force of the sole; it avoids discomfort caused by strong impact and extrusion of soft tissues such as nerves and blood vessels on the sole. At the same time, the penetrating form also increases the specific surface area of the entire second support plate 4, and cooperates with the rough matte surface of the support plate to increase the degradation efficiency.

[0054] Adopting the form of alternately arranging the midsole and support plate components, in addition to increasing the resilience and support of the sole, it makes up for the performance disadvantages of the degradable PBAT material midsole; it also adds more layers in the thickness direction of the sole, facilitating more attachment points for microorganisms during the degradation process and increasing the degradation rate.

[0055] The outsole is a bio - based polyester rubber, and its performance meets: hardness 65 - 75A, density 1.25 - 1.35 g / cm 3 , tensile strength 10 - 12 MPa, 90 - degree tear 50 - 60 kg / cm, elongation at break 250 - 600%, DIN abrasion 80 - 180 mm 3 , Akron abrasion 0.25 - 0.4 cm 3 , abrasion scar length 4 - 6 cm, yellowing resistance level 4, aging level 4, ozone resistance qualified without cracking.

[0056] Between the first midsole 1 and the first support plate 2, the first midsole 1 and the second midsole 3, the first support plate 2 and the second midsole 3, the second midsole 3 and the second support plate 4, and between the second support plate 4 and the outsole, as well as between the vamp support strip and the periphery of the sole, they are bonded and formed by a biodegradable glue.

[0057] The biodegradable glue is copolymerized from four monomers with a mass ratio of AA:BDO:CHDM:BEDO = 100:40:40:20; it meets both biodegradability and high bonding ability at the same time.

[0058] For the degradable sample shoes made in the above manner, test the sample shoes and test their support, shock absorption and resilience performance.

[0059] Experimental method: The test data was tested according to the running shoe stability comparison test standard of the American Society for Testing and Materials (ASTM) (ASTM F1833-2011 Standard Test Method for Comparison of Rearfoot Motion Control Properties of Running Shoes). Recruit 8 healthy male runners with a shoe size of US9. Wear running shoes and run on a treadmill at a speed of 3.3 m / s. After running stably for 1 minute, collect continuous kinematic data of the right lower limb for 10 steps. At the same time, according to the test method in the shock absorption performance test standard of shoes in the People's Republic of China (GBT 30907-2014 Test Method for Shock Absorption Performance of Rubber Shoes and Sports Shoes), test the shock absorption support and resilience performance of the fully degradable sports shoes of the present invention. As shown in Table 1.

[0060] Table 1 Biomechanical performance test

[0061] Experimental item Value Unit Anti-torsion (valgus torque 30°) left 3.32 Nm Anti-torsion (valgus torque 30°) right 3.31 Nm Impact deformation 12.4 mm Energy return 65.5 ％ Heel shock absorption 8.52 g

[0062] The above biomechanical test results show that the fully degradable shoes of the present invention can not only effectively reduce the pressure of valgus torsion, and have good shock absorption and resilience at the heel, indicating that the sole will not sink excessively when touching the ground, and the extension efficiency is increased. On the premise of being degradable, it can provide good support, shock absorption performance and resilience performance. Meet the needs of sports use.

[0063] Further test its degradation performance. Use the compost degradation method to conduct degradation experiments on three pairs of sample shoes as a whole.

[0064] Test method: GB / T 19277.1-2011

[0065] Test conditions:

[0066] Test temperature: (58±2) °C

[0067] Volume of compost container: 3.8 L

[0068] Number of compost containers:

[0069] 3 containers for test materials

[0070] 3 containers for reference materials

[0071] 3 blank containers

[0072] Reference material: Cellulose (chromatographically pure)

[0073] Test period: 180 days

[0074] The test results are shown in Table 2.

[0075]

[0076]

[0077] The sample shoes corresponding to different sample numbers are the same, but the compost sources are different. #1, #2, and #3 are respectively selected from the compost produced by the organic matter in municipal solid waste in the composting device, the compost produced by gardens in the composting device, and the compost produced by the mixture of garden waste and municipal solid waste in the composting device. The specific treatment process of the compost refers to the experimental method of GB / T 20197-2006.

[0078] For the 3# test sample, since the compost used is a mixed compost, the microorganisms are more diverse and the relative biodegradation rate is higher.

[0079] According to the standard T / CLIAS012-2024 "Evaluation of the Biodegradability of Footwear", the requirement for Grade I is that the absolute biodegradation rate or relative biodegradation rate ≥ 80%; the requirement for Grade II is that the absolute biodegradation rate or relative biodegradation rate ≥ 70%; the test results of Example 1 fully meet the requirements of Grade I for degradation performance.

[0080] It should be noted that the degradation generally occurs from the outside to the inside. The surface area of the whole shoe is not only smaller than the sum of the surface areas of each individual shoe component, and the degradation process of the whole shoe is also different from the degradation process of each individual shoe component, and the degradation rate is slower; however, under the 180-day test period, the average relative biodegradation rate of the whole shoe reaches more than 80%, indicating that the degradable shoe of the present invention fully meets the concept of complete degradation.

[0081] In the example, no additional decorative materials were added to the surface of the sample shoes, and no additional dyeing and finishing treatments were carried out. The degradation was also carried out directly on the whole shoe for the degradation experiment. In the actual production process, if the scheme of the present invention is adopted, adding non-degradable metal wires, polymer materials or adding reinforced carbon fibers to the support plate outside the whole shoe will all affect the degradation rate of the whole shoe. Similarly, if pre-treatment means such as disassembling and crushing are adopted before actual degradation, it will further enhance the degradation rate of the whole shoe.

[0082] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the technical content prompted above to form equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A fully degradable sports shoe, comprising an upper, an insole and a sole, characterized in that: The shoe upper includes shoelaces, foam tongue, shoe upper mesh, inner foam, and inner lining; the insole includes insole cloth and insole foam; the sole includes a midsole, an outer sole, and a support plate; an upper support strip is provided at the junction of the sole and the upper; the outer sole and the midsole, the support plate and the midsole or the outer sole, the upper sole and the midsole or the support plate, the shoe upper mesh and the upper support strip, the insole cloth and the insole foam are bonded and formed by biodegradable glue; The yarn used for the upper and insole fabric is at least one of polylactic acid yarn, biodegradable polyester yarn, and polycaprolactone yarn; the foaming material used for the upper and insole foam and the midsole material are supercritical PBAT materials, and the outsole is bio-based polyester rubber material; The upper support strip is made of at least one of PLA, PBAT, PBS, PHA, or a blend of two or more thereof; the upper support strip is arranged around the sole to fix the upper mesh and the sole, and its high tensile strength, elongation, and bending strength effectively complement the corresponding performance of the sole.

2. The fully degradable sports shoes according to claim 1, characterized in that: The physical properties of the upper support strip are: hardness 40-60D, density 1.25-1.35g / cm 3 , tensile strength 15-30MPa, elongation 700-1500%, flexural strength 10-20MPa; Flexural modulus 200-500MPa.

3. The fully degradable sports shoes according to claim 1, characterized in that: The insole foam material is supercritical PBAT material with a density of 0.08-0.12g / cm 3 , hardness 25-35C, energy return 70-75%.

4. The fully degradable sports shoe according to claim 1, characterized in that: The midsole is made of supercritical foamed PBAT material with a density of 0.12-0.18g / cm 3 , hardness 35C-45C, tensile strength 1.2-1.8MPa, 180 degree tear 2.5-4.0kg / cm, 90 degree tear 15-20kg / cm, energy return 65-73%.

5. The fully degradable sports shoe according to any one of claims 1 to 4, characterized in that: The outsole is made of bio-based polyester rubber material. After cross-linking, the performance meets the following requirements: hardness 65-75A, density 1.25-1.35g / cm 3 , tensile strength 10-12MPa, 90 degree tear 50-60kg / cm, elongation 250-600%, DIN abrasion 80-180mm 3 , Akron wear 0.25-0.4cm 3 , wear scar length 4-6cm, yellowing resistance level 4, aging level 4, ozone resistance qualified without cracking.

6. The fully degradable sports shoe according to any one of claims 1 to 4, characterized in that: The support plate is arranged between the midsole and / or between the midsole and the outsole. The support plate adopts a biodegradable epoxy resin composite material, which is composed of plant fiber or carbon fiber + degradable epoxy resin; the proportion of degradable epoxy resin is 40-80%, the overall thickness of the support plate is 0.8-2mm, and it includes 4-8 layers of fiber plies.

7. The fully degradable sports shoes according to claim 6, characterized in that: The support plate includes a first support plate and a second support plate, and the midsole includes a first midsole and a second midsole; the first support plate is arranged between the first midsole and the second midsole; the second support plate is arranged below the midsole and connected to the outsole; the first support plate runs through the front and back of the sole as a whole, and its area is smaller than that of the first midsole; the second support plate includes an inward-curved suspended area and a pressure-bearing area directly connected to the outsole, the inward-curved suspended area runs from the front of the sole to the back of the sole, thereby increasing the specific surface area of ​​the entire second support plate; the inward-curved suspended area generates elastic deformation when subjected to downward pressure from the arch of the foot, thereby enhancing the resilience of the sole and further providing support for the sole.

8. The fully degradable sports shoes according to claim 7, characterized in that: The inner surface and part of the outer surface of the support plate are matte-finished to increase the surface roughness, so as to increase the attachment surface area of ​​microorganisms and improve the degradation efficiency during industrial composting.

9. The fully degradable sports shoe according to claim 1, characterized in that: The biodegradable glue is copolymerized by the following monomers: adipic acid, 1,4-butanediol, 1,4-cyclohexanedimethanol and 1,4-butenediol, and the mass ratio of the four monomers is adipic acid: 1,4-butanediol: 1,4-cyclohexanedimethanol: 1,4-butenediol = 100:40:40:

20.

10. The fully degradable sports shoe according to any one of claims 1, 6 and 7, characterized in that: Support plate performance meets: hardness 70-85D, density 1.30-1.80g / cm 3 , tensile strength 5-20GPa, elongation 0.5-2%, flexural strength 5-20GPa; flexural modulus 10-50Gpa.

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