A degradable environmentally friendly material for shoe soles and preparation method thereof

Abstract

The present application relates to the field of environmentally friendly materials, more specifically, it relates to a degradable environmentally friendly material for soles and a preparation method thereof. The material composition includes the following parts by weight: according to parts by weight, 13-18 parts of TPU, 1-3 parts of TPR, 1-3 parts of plasticizer, 0.5-1.5 parts of foaming agent, 1-3 parts of cross-linking agent, 13-20 parts of degradable filler, and 40-80 parts of biodegradable resin are weighed. The present application improves the degradability rate and mechanical properties of the degradable material by adding biodegradable resin and degradable filler, and improves the elasticity, wear resistance and strength of the degradable material by adding TPU and TPR, and under the auxiliary effect of cross-linking agent, foaming agent and plasticizer, the degradable environmentally friendly material obtained has better degradability rate and mechanical properties. When it is used to produce soles, it has better mechanical properties and degradability, reduces the possibility of accumulation and causing environmental pollution.

Description

Technical Field

[0001] The present application relates to the field of environmentally friendly materials, and more specifically, to a degradable environmentally friendly material for shoe soles and a preparation method thereof. Background Art

[0002] With the rapid development of modern society, people's concept of wearing shoes has changed significantly. From the protection and heat preservation of the last century, people now pursue lightness, comfort, aesthetics, shock absorption, wear resistance and other functions. Currently, the soles of sports shoes can be divided into vulcanized rubber soles, air cushion soles and foam soles. Among them, foam soles are not only soft and comfortable, but also affordable, and therefore widely used.

[0003] Currently, most athletic footwear soles are made primarily of EVA, mixed with other materials and foamed to create a foamed material. EVA and its blended foams are widely used due to their lightweight, warm, comfortable, and low-cost properties. However, EVA foams often have high density, poor elasticity, and poor wear resistance and slip resistance, making them inadequate for modern lifestyles. Therefore, research is underway to combine EVA with other materials, such as rubber and polyurethane, to improve their overall performance.

[0004] However, as people's awareness of environmental protection gradually increases, materials such as EVA, rubber, and polyurethane are difficult to degrade quickly in the environment and difficult to recycle, and thus accumulate and affect the ecological environment. Therefore, further research on sole materials is needed. Summary of the Invention

[0005] In order to solve the above technical problems, the present application provides a degradable and environmentally friendly material for shoe soles and a preparation method thereof.

[0006] In a first aspect, the present application provides a biodegradable and environmentally friendly material for shoe soles, comprising the following raw materials in parts by weight:

[0007] TPU 13-18 parts

[0008] TPR1-3 servings

[0009] 1-3 parts crosslinking agent

[0010] 1-3 parts plasticizer

[0011] 0.5-1.5 parts of foaming agent

[0012] 13-20 parts of degradable filler

[0013] 40-80 parts of biodegradable resin.

[0014] The raw material composition and dosage range of the above scheme are both preferred choices for this application. TPU, short for thermoplastic polyurethane elastomer, has excellent wear resistance, excellent ozone resistance, high hardness, high strength, and good elasticity. The resulting biodegradable and environmentally friendly material has advantages such as good wear resistance, odor resistance, and good elasticity when used in shoe soles. TPR is a polyolefin thermoplastic elastomer that is soft and elastic. Combined with TPU, it can further improve the mechanical properties of the sole material.

[0015] The biodegradable filler has a degradable rate, which can improve the degradable efficiency and filling effect of the sole material, thereby enhancing the degradability and mechanical properties of the biodegradable environmentally friendly material. Biodegradable resin can be decomposed by microorganisms in the natural environment.

[0016] By adding biodegradable resins and degradable fillers, the degradation rate and mechanical properties of the degradable material are improved, and the addition of TPU and TPR improves the elasticity, wear resistance and strength of the degradable material. With the auxiliary action of cross-linking agents, foaming agents and plasticizers, the obtained degradable and environmentally friendly material has better degradation rate and mechanical properties. When used to produce soles, it has good mechanical properties and degradation rate, reducing the possibility of environmental pollution caused by accumulation.

[0017] Preferably, the biodegradable resin is composed of one or more of PLA, PBAT, PBS, and PCL.

[0018] PLA, PBAT, and PBS are all biodegradable resins. Therefore, the use of one or more biodegradable resins composed of PLA, PBAT, and PBS can improve the degradation efficiency of degradable and environmentally friendly materials.

[0019] Preferably, the biodegradable resin is composed of three of PLA, PBAT, PBS and PCL.

[0020] Among them, PLA has better antibacterial properties, tensile strength and impact strength, but poor elongation at break; PBAT combines the characteristics of PBA and PBT, with good ductility and elongation at break, as well as good heat resistance and impact performance; PBS is the abbreviation of polybutylene succinate, which has elongation at break and tensile strength; PCL is the abbreviation of polycaprolactone, which has better flexibility and compatibility with polymers.

[0021] Therefore, the use of three components among PLA, PBAT, PBS and PCL can combine their performances, thereby enabling the degradable and environmentally friendly materials to obtain better mechanical properties and degradable efficiency.

[0022] Furthermore, when a biodegradable resin composed of PLA, PBAT, and PCL in a weight ratio of (2.5-4.3):1:(1.2-2.0) or a biodegradable resin composed of PLA, PBS, and PCL in a weight ratio of (3.3-4.5):1:(1.8-2.5) is used for degradable and environmentally friendly materials, its mechanical properties and degradation rate can be optimized.

[0023] Specifically, when PLA, PBAT, PCL or PLA, PBS, PCL are compounded, PCL has better flexibility and polymer compatibility, which makes the biodegradable resin easily compatible with TPR and TPU. At the same time, PLA, PBAT, PCL or PLA, PBS, PCL are compounded, and their mechanical properties are combined to further improve the degradation rate and mechanical properties of the degradable and environmentally friendly materials. When the degradable and environmentally friendly materials are used to produce soles, the possibility of wear and breakage is reduced, and at the same time, the possibility of environmental pollution caused by accumulation after disposal is reduced.

[0024] Preferably, the degradable filler is composed of the following raw materials in parts by weight:

[0025] 5.5-8.5 parts banana fiber

[0026] 1-3 parts bamboo fiber

[0027] 2.3-4.3 parts poplar wood powder

[0028] 3-8 parts of pine wood powder.

[0029] The above raw material composition and weight range of the raw materials are all preferred choices for this application. The banana fiber, poplar wood powder, Chinese pine wood powder and bamboo fiber are natural products and have a good degradability.

[0030] Among them, banana fiber is obtained by processing the stems of bananas. Its main components are cellulose, hemicellulose and lignin. It has good flexibility, light weight, strong antibacterial properties, and easy degradation. Bamboo fiber is cellulose fiber extracted from naturally grown bamboo. It has strong wear resistance, odor resistance and UV resistance. The main component of poplar wood powder is lignin. It has the advantage of light weight and has a toughening effect after filling. Chinese pine wood powder has the same effect as poplar wood powder. Both can improve the mechanical properties and degradation rate of degradable and environmentally friendly materials.

[0031] This application utilizes a combination of banana fiber, poplar wood flour, Chinese pine wood flour, and bamboo fiber to further enhance the degradation efficiency and mechanical properties of the biodegradable environmentally friendly material. When used to produce shoe soles, the biodegradable environmentally friendly material exhibits advantages such as light weight, good toughness, and resistance to breakage and wear. Furthermore, it reduces the accumulation of discarded shoe soles, which can pollute the ecological environment.

[0032] Preferably, the degradable filler is a modified degradable filler, and the modified degradable filler is prepared by the following steps:

[0033] 1) According to parts by weight, 5.5-8.5 parts of banana fiber, 1-3 parts of bamboo fiber, 2.3-4.3 parts of poplar wood powder, and 3-8 parts of Chinese pine wood powder were weighed, mixed evenly, crushed, and sieved through 100-300 mesh to obtain a mixed filler;

[0034] 2) completely immersing the mixed filler obtained in 1) in anhydrous ethanol for 1-3 minutes, draining the anhydrous ethanol, and then immersing it in alkaline solution for 6-12 hours, filtering, and drying to obtain a pretreated mixture;

[0035] 3) Weigh 10-20 parts of the pretreated mixture obtained in 2) and add it to 30-50 parts of the coating liquid, heat it to 55-75° C., stir it for 90-150 minutes, filter it, and dry it to obtain a modified degradable filler.

[0036] To further enhance the compatibility of the biodegradable filler with the biodegradable environmentally friendly material raw material system, the present application further modifies the biodegradable filler. Specifically, banana fiber, poplar wood powder, Chinese pine wood powder, and bamboo fiber are ground to obtain a powdered mixed filler. This is then soaked in anhydrous ethanol to remove impurities, contamination, and adhesion from the mixed filler. The mixed filler is then soaked in an alkali solution to remove hemicellulose and other substances from the mixed filler, thereby enhancing its toughness. The alkali solution is a 5-10% sodium hydroxide solution by mass.

[0037] The mixed filler is then treated with a coating solution consisting of a 1:30 ratio of KH-570 silane coupling agent to water, forming a coating film on its surface. Due to the coupling effect of the silane coupling agent, the coating film formed on its surface further improves the compatibility of the modified degradable filler with the degradable and environmentally friendly material, thereby enhancing its mechanical properties.

[0038] Preferably, the coating solution comprises the following raw materials in parts by weight:

[0039] 1-3 parts water-based rosin

[0040] 0.8-1.5 parts of xanthan gum

[0041] 0.2-0.8 parts of mussel mucin

[0042] 0.5-1 part sodium alginate

[0043] 40-60 parts of 65-75% alcohol solution by mass.

[0044] Preferably, the coating solution is prepared by the following steps:

[0045] Step 1: Weigh 1-3 parts of aqueous rosin by weight and dissolve it in 40-60 parts of 65-75% alcohol solution, heat to 50-60°C, add 0.8-1.5 parts of xanthan gum, and stir for 30-60 minutes to obtain mixture A;

[0046] Step 2: Weigh 0.2-0.8 parts of mussel mucin and 0.5-1 parts of sodium alginate according to weight, mix them evenly with the mixture A obtained in step 1, heat to 70-80° C., and stir for 40-70 minutes to obtain a coating solution.

[0047] In order to further improve the degradation rate and mechanical properties of degradable and environmentally friendly materials.

[0048] The present application uses a coating liquid of water-based rosin, xanthan gum, mussel mucin, sodium alginate and alcohol solution to coat the degradable filler to form a coating film, further improving the compatibility of the modified degradable filler with the degradable environmentally friendly material, thereby improving its mechanical properties and degradation rate.

[0049] Among them, water-based rosin is a rosin resin that can be dissolved in aqueous solvents such as alcohol, ethanol, and methanol. After being dissolved in an alcohol solution, it can have better adhesion and compatibility and is compatible with a variety of polymers; xanthan gum is a polysaccharide. After being dissolved in an alcohol solution, it can further improve its adhesion, wettability and film-forming properties, making it easy for the coating liquid to be coated on the surface of the degradable filler.

[0050] Mussel mucin has high strength, high toughness and waterproofness, as well as extremely strong adhesion matrix function, and also has good biocompatibility and degradability; sodium alginate has viscosity-increasing and thickening effects, which can further improve the adhesion of the coating liquid, making the coating film it forms more stable.

[0051] The water-based rosin, xanthan gum, mussel mucin, and sodium alginate used in this application are all natural raw materials. When used in combination, they can work synergistically, resulting in a coating solution with good adhesion and coating effectiveness. The resulting coating film is also highly compatible with the polymer, allowing for thorough and uniform mixing of the modified degradable filler with the raw material system of the degradable and environmentally friendly material, further improving the mechanical properties and degradation rate of the degradable and environmentally friendly material. When used in shoe soles, these materials improve the wear resistance and toughness of the soles, while enabling the rapid decomposition of discarded soles in the environment, reducing accumulation and impact on the ecological environment.

[0052] Preferably, the plasticizer is epoxidized soybean oil or diisononyl-1,2-cyclohexanedicarboxylate.

[0053] Using the above-mentioned epoxy soybean oil or 1,2-cyclohexanedicarboxylic acid diisononyl ester as a plasticizer can achieve a better plasticizing effect and improve the processing efficiency and mechanical properties of the degradable and environmentally friendly materials.

[0054] Preferably, the foaming agent is calcium carbonate or sodium bicarbonate.

[0055] Calcium carbonate or sodium bicarbonate can achieve better foaming effects on biodegradable and environmentally friendly materials.

[0056] Preferably, the cross-linking agent is dicumyl peroxide. The cross-linking agent has a good cross-linking effect, so that the obtained degradable environmentally friendly material has good mechanical properties.

[0057] In a second aspect, the present application provides a method for preparing a degradable and environmentally friendly material for shoe soles, using the following technical solution:

[0058] According to weight, weigh 13-18 parts of TPU, 1-3 parts of TPR, 1-3 parts of plasticizer, 13-20 parts of degradable filler, and 40-80 parts of biodegradable resin, mix them, heat to 110-125°C, stir for 10-20 minutes, then add 0.5-1.5 parts of foaming agent and 1-3 parts of cross-linking agent, stir evenly to obtain a mixture, and inject molding the mixture to obtain a degradable and environmentally friendly material.

[0059] The above-mentioned production process is simple to operate and has high production efficiency. The resulting biodegradable and environmentally friendly material has both good mechanical properties and biodegradability. When used in shoe soles, it reduces wear and tear on the soles and reduces environmental pollution caused by discarded soles.

[0060] In summary, this application has the following beneficial effects:

[0061] 1. By adding biodegradable resins and degradable fillers, the degradation rate and mechanical properties of the degradable material are improved, and by adding TPU and TPR, the elasticity, wear resistance and strength of the degradable material are improved. With the auxiliary action of cross-linking agents, foaming agents and plasticizers, the obtained degradable and environmentally friendly material has better degradation rate and mechanical properties. When it is used to produce soles, it has better mechanical properties and degradation rate, and reduces the possibility of accumulation and causing environmental pollution; 2. By compounding PLA, PBAT, PCL or PLA, PBS, PCL, and combining their mechanical properties, the degradation rate and mechanical properties of the degradable and environmentally friendly material are further improved. When the degradable and environmentally friendly material is used to produce soles, the possibility of wear and breakage is reduced. At the same time, the possibility of environmental pollution caused by accumulation after disposal is reduced.

[0062] 3. By compounding banana fiber, poplar wood powder, pine wood powder and bamboo fiber, the degradable and environmentally friendly material can obtain better degradability and mechanical properties. When used to produce soles, it has light weight, good toughness, and is not easy to be damaged and worn; at the same time, it reduces the accumulation of discarded soles and pollutes the ecological environment.

[0063] 4. The mixed filler is treated with a coating liquid to form a coating film on the surface of the mixed filler, which can further improve the compatibility of the modified degradable filler with the degradable and environmentally friendly material, thereby improving its mechanical properties.

[0064] 5. The water-based rosin, xanthan gum, mussel mucin and sodium alginate used are all natural raw materials. When they are compounded, they can play a synergistic role, so that the obtained coating liquid has good adhesion and coating effect. At the same time, the formed coating film has good compatibility with the polymer, thereby improving the compatibility of the modified degradable filler with the raw material system of the degradable and environmentally friendly material, thereby improving the mechanical properties and degradation rate of the degradable and environmentally friendly material. DETAILED DESCRIPTION

[0065] The present application is further described in detail below with reference to the embodiments.

[0066] Sources or performance parameters of some raw materials:

[0067] TPU manufacturer Covestro of Germany, model 192X;

[0068] TPR manufacturer is Kraton, USA, model 3226;

[0069] PLA manufacturer: NatureWorks, USA, model 3052D;

[0070] PBAT's elongation at break is 450%, as tested in accordance with GB / T 1040-1992; its tensile strength is 45 MPa, as tested in accordance with GB / T 1040-1992; and its degradation rate after 100 days reaches 99%, as tested in accordance with ASTM D6400 / EN 13432.

[0071] The elongation at break of PBS is 380%, tested according to ISO527-2; the tensile strength is 24 MPa, tested according to ISO527-2; the average molecular weight of PCL is 50,000;

[0072] Water-based rosin, average molecular weight 1200, viscosity (melting at 150℃) 1500 ripoise.

[0073] The protein content of mussel mucin is 98%.

[0074] Example

[0075] Example 1

[0076] A method for preparing a degradable and environmentally friendly material for shoe soles comprises the following steps:

[0077] Weigh 13 kg of TPU, 1 kg of TPR, 1 kg of plasticizer, 13 kg of degradable filler, and 40 kg of biodegradable resin, put them into a kneader for mixing, heat to 110°C, stir for 10 minutes, then add 0.5 kg of foaming agent and 1 kg of cross-linking agent, stir evenly to obtain a mixture, and inject molding the mixture to obtain a degradable and environmentally friendly material.

[0078] The biodegradable resin is PLA. The foaming agent is calcium carbonate. The plasticizer is epoxidized soybean oil. The crosslinking agent is dicumyl peroxide.

[0079] The degradable filler is obtained by the following steps: 5.5 kg of banana fiber, 1 kg of bamboo fiber, 2.3 kg of poplar wood powder and 3 kg of Chinese pine wood powder are evenly mixed, put into a grinder for grinding, and sieved through 100 meshes to obtain the degradable filler.

[0080] Example 2

[0081] A method for preparing a degradable and environmentally friendly material for shoe soles comprises the following steps:

[0082] Weigh 15 kg of TPU, 2 kg of TPR, 2 kg of plasticizer, 18 kg of degradable filler, and 60 kg of biodegradable resin, put them into a kneader for mixing, heat to 120°C, stir for 15 minutes, then add 1 kg of foaming agent and 2 kg of cross-linking agent, stir evenly to obtain a mixture, and inject molding the mixture to obtain a degradable and environmentally friendly material.

[0083] The biodegradable resin is PLA. The foaming agent is sodium bicarbonate. The plasticizer is epoxidized soybean oil. The crosslinking agent is dicumyl peroxide.

[0084] The degradable filler is obtained by the following steps: 6.5 kg of banana fiber, 2 kg of bamboo fiber, 3.5 kg of poplar wood powder and 5 kg of Chinese pine wood powder are evenly mixed, put into a grinder for grinding, and sieved through 200 meshes to obtain the degradable filler.

[0085] Example 3

[0086] A method for preparing a degradable and environmentally friendly material for shoe soles comprises the following steps:

[0087] Weigh 18 kg of TPU, 3 kg of TPR, 3 kg of plasticizer, 20 kg of degradable filler, and 80 kg of biodegradable resin, put them into a kneader for mixing, heat to 125°C, stir for 20 minutes, then add 1.5 kg of foaming agent and 3 kg of cross-linking agent, stir evenly to obtain a mixture, and inject molding the mixture to obtain a degradable and environmentally friendly material.

[0088] The biodegradable resin is PLA. The foaming agent is sodium bicarbonate. The plasticizer is epoxidized soybean oil. The crosslinking agent is dicumyl peroxide.

[0089] The degradable filler is obtained by the following steps: 8.5 kg of banana fiber, 3 kg of bamboo fiber, 4.3 kg of poplar wood powder and 8 kg of Chinese pine wood powder are evenly mixed, put into a grinder for grinding, and sieved through 300 meshes to obtain the degradable filler.

[0090] Example 4

[0091] The difference between Example 4 and Example 1 is that the degradable masterbatch is composed of PLA, PBS, and PCL in a weight (kg) ratio of 2.5:1:1.2.

[0092] Example 5

[0093] The difference between Example 5 and Example 1 is that the degradable masterbatch is composed of PLA, PBS, and PCL in a weight (kg) ratio of 4.3:1:2.0.

[0094] Example 6

[0095] The difference between Example 6 and Example 1 is that the degradable masterbatch is composed of PLA, PBAT, and PCL in a weight (kg) ratio of 3.8:1:2.2.

[0096] Example 7

[0097] The difference between Example 7 and Example 5 is that the degradable filler is a modified degradable filler, and the modified degradable filler is prepared by the following steps:

[0098] 1) Weigh 5.5kg banana fiber, 1kg bamboo fiber, 2.3kg poplar wood powder, and 3kg Chinese pine wood powder into a grinder and grind them, sieve 200 mesh, and obtain a mixed filler;

[0099] 2) The mixed filler obtained in 1) was completely immersed in anhydrous ethanol for 2 hours, filtered, and the anhydrous ethanol was recovered. The solid obtained by filtration was placed in an alkali solution and immersed for 10 hours, filtered, and the alkali solution was recovered. The filtered solid was rinsed with clean water and then placed in an oven at 50° C. for drying for 6 hours to obtain a pretreated mixture;

[0100] 3) Weigh 10 kg of the pretreated mixture obtained in 2) and add it to 30 kg of the coating liquid. Heat it to 60° C., stir it for 120 min, filter it, and dry the filter residue in an oven at 50° C. for 6 h to obtain a modified degradable filler.

[0101] The coating liquid is KH-570 silane coupling agent diluted with water at a ratio of 1:30. The alkali solution is 8% sodium hydroxide solution by mass.

[0102] Examples 8-9

[0103] The difference between Example 8-9 and Example 7 is that the amount of modified degradable filler raw material used is different, as shown in Table 1;

[0104] Table 1 Amount of modified degradable filler raw materials used in Examples 7-9 (kg)

[0105] Raw material dosage Example 7 Example 8 Example 9 Banana fiber 5.5 6.8 8.5 bamboo fiber 1 2 3 Poplar wood powder 2.3 3.5 4.3 Pine wood powder 3 5 8 coating liquid 30 25 40 Pre-treated mixture 10 15 20

[0106] Example 10

[0107] The difference between Example 10 and Example 8 is that the coating liquid is prepared by the following steps:

[0108] Step 1: Weigh 1 kg of water-based rosin and dissolve it in 40 kg of 65% alcohol solution, heat to 50°C, add 0.8 kg of xanthan gum, and stir for 50 minutes to obtain mixture A;

[0109] Step 2: Weigh 0.2 kg of mussel mucin and 0.5 kg of sodium alginate, mix them evenly with the mixture A obtained in step 1, heat to 70° C., and stir for 50 minutes to obtain a coating solution.

[0110] Examples 11-12

[0111] The difference between Example 11-12 and Example 10 is that the amount of the coating liquid raw material is different, as shown in Table 2;

[0112] Table 2 Coating liquid raw material dosage of Examples 10-12 (kg)

[0113]

[0114]

[0115] Comparative Example

[0116] Comparative Example 1

[0117] The difference between Comparative Example 1 and Example 1 is that the degradable filler is replaced by starch in equal amounts.

[0118] Comparative Example 2

[0119] The difference between Comparative Example 2 and Example 1 is that TPU is replaced by TPR in equal amounts.

[0120] Comparative Example 3

[0121] The difference between Comparative Example 3 and Example 1 is that the degradable filler is replaced by TPU in equal amounts.

[0122] Comparative Example 4

[0123] The difference between Comparative Example 4 and Example 1 is that an equal amount of banana fiber is replaced by bamboo fiber.

[0124] Comparative Example 5

[0125] The difference between Comparative Example 5 and Example 9 is that an equal amount of mussel mucin is replaced by sodium alginate.

[0126] Performance testing

[0127] The degradable and environmentally friendly materials obtained in Examples 1-12 and Comparative Examples 1-5 were subjected to the following performance tests.

[0128] Detection method / test method

[0129] 1. Tensile strength and elongation at break

[0130] With reference to the national standard GB / T 528-2009, the tensile strength and elongation at break were tested. The test specimen type was Type 1. The specific data are shown in Table 3.

[0131] 2. Tear strength

[0132] The tear strength was tested with reference to GB / T 529-2008. The specific data are shown in Table 3.

[0133] 3. Degradability

[0134] The test was conducted with reference to GB / T 29646-2013, where the burial time was 100 days and the mass loss was calculated as follows: degradation rate = [1-(mass after burial / mass before burial)] * 100%. The specific data are shown in Table 3.

[0135] Table 3 Experimental data of Examples 1-12 and Comparative Examples 1-5

[0136]

[0137]

[0138] Combining Example 1 and Comparative Example 1 and Table 3, it can be seen that the tensile strength, elongation at break and tear strength of Example 1 are all higher than those of Comparative Example 1, indicating that the degradable and environmentally friendly material prepared by the present application has good mechanical properties and reduces the wear and tear of shoes during use.

[0139] Combining Example 1 and Comparative Example 2 with Table 3, it can be seen that the tensile strength, elongation at break and tear strength of Example 1 are all higher than those of Comparative Example 2, indicating that by compounding TPU and TPR, their properties can be combined to make the mechanical properties of the degradable and environmentally friendly material better.

[0140] Combining Example 1 and Comparative Example 3 and Table 3, it can be seen that the degradation rate, tensile strength, elongation at break and tear strength of Example 1 are all higher than those of Comparative Example 3, indicating that the addition of degradable fillers in this application can further improve the mechanical properties and degradation rate of the degradable and environmentally friendly material.

[0141] Combining Example 1 and Comparative Example 4 with Table 3, it can be seen that the degradable rate, tensile strength, elongation at break, and tear strength of Example 1 are all higher than those of Comparative Example 4, indicating that the degradable and environmentally friendly material obtained by compounding the banana fiber, bamboo fiber, poplar wood powder, and Chinese pine wood powder of the present application has better degradable rate and mechanical properties.

[0142] Combining Example 1 and Comparative Example 5 with Table 3, it can be seen that the degradation rate, tensile strength, elongation at break, and tear strength of Example 1 are all higher than those of Comparative Example 5, indicating that the coating liquid obtained by adding mussel mucin can be better coated on the degradable filler, so that the mechanical properties and degradation rate of the obtained degradable and environmentally friendly material can be better.

[0143] Combining Example 1 and Examples 4-6 with Table 3, it can be seen that the degradation rate, tensile strength, elongation at break, and tear strength of Example 1 are all lower than those of Examples 5-7, indicating that the degradable and environmentally friendly materials obtained by using PLA, PBS, PCL or a composite of PLA, PBS, and PCL have better degradation and mechanical properties.

[0144] Combining Example 5 and Examples 7-9 with Table 3, it can be seen that the tensile strength, elongation at break and tear strength of Example 5 are lower than those of Examples 7-9, indicating that the modified degradable filler can improve its compatibility, enable the degradable filler to be fully mixed with the raw material system of the degradable environmentally friendly material, and improve its mechanical properties.

[0145] Combining Example 9 and Examples 10-12 and Table 3, it can be seen that the degradation rate, tensile strength, elongation at break, and tear strength of Example 5 are all lower than those of Examples 10-12, indicating that the coating liquid prepared by the present application has a good coating effect, which enables the degradable filler to be fully mixed with the raw material system of the degradable filler, thereby improving the mechanical properties and degradation rate of the degradable and environmentally friendly material.

[0146] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A degradable and environmentally friendly material for shoe soles, characterized in that: The invention comprises the following raw materials in parts by weight: TPU 13-18 parts TPR1-3 servings 1-3 parts crosslinking agent 1-3 parts plasticizer 0.5-1.5 parts of foaming agent 13-20 parts of degradable filler 40-80 parts of biodegradable resin; The degradable filler is composed of the following raw materials in parts by weight: 5.5-8.5 parts banana fiber 1-3 parts bamboo fiber 2.3-4.3 parts poplar wood powder 3-8 parts of pine wood powder; The biodegradable resin is composed of one or more of PLA, PBAT, PBS, and PCL.

2. The biodegradable environmentally friendly material for shoe soles according to claim 1, characterized in that: The biodegradable resin is composed of three of PLA, PBAT, PBS and PCL.

3. The biodegradable environmentally friendly material for shoe soles according to claim 1, characterized in that: The degradable filler is a modified degradable filler, and the modified degradable filler is prepared by the following steps: 1) Weigh 5.5-8.5 parts of banana fiber, 1-3 parts of bamboo fiber, 2.3-4.3 parts of poplar wood flour, and 3-8 parts of Chinese pine wood flour, mix them evenly, grind them, and sieve them through 100-300 mesh to obtain a mixed filler; 2) Completely immersing the mixed filler obtained in 1) in anhydrous ethanol for 1-3 minutes, draining the anhydrous ethanol, and then immersing it in alkaline solution for 6-12 hours, filtering, and drying to obtain a pretreated mixture; 3) Weigh 10-20 parts by weight of the pretreated mixture obtained in 2) and add it to 30-50 parts of the coating liquid. Heat to 55-75° C., stir for 90-150 minutes, filter, and dry to obtain a modified degradable filler.

4. The degradable and environmentally friendly material for shoe soles according to claim 3, characterized in that: The coating solution comprises the following raw materials in parts by weight: 1-3 parts water-based rosin 0.8-1.5 parts of xanthan gum 0.2-0.8 parts of mussel mucin 0.5-1 part sodium alginate 40-60 parts of 65-75% alcohol solution by mass.

5. The degradable and environmentally friendly material for shoe soles according to claim 4, characterized in that: The coating solution is prepared by the following steps: Step 1: Weigh 1-3 parts of aqueous rosin by weight and dissolve it in 40-60 parts of 65-75% alcohol solution, heat to 50-60°C, add 0.8-1.5 parts of xanthan gum, and stir for 30-60 minutes to obtain mixture A; Step 2: Weigh 0.2-0.8 parts of mussel mucin and 0.5-1 parts of sodium alginate according to weight, mix them evenly with the mixture A obtained in step 1, heat to 70-80° C., and stir for 40-70 minutes to obtain a coating solution.

6. The biodegradable and environmentally friendly material for shoe soles according to claim 1, characterized in that: The plasticizer is epoxidized soybean oil or diisononyl 1,2-cyclohexanedicarboxylate.

7. The biodegradable and environmentally friendly material for shoe soles according to claim 1, characterized in that: The foaming agent is calcium carbonate or sodium bicarbonate.

8. A method for preparing the degradable and environmentally friendly material for shoe soles according to any one of claims 1 to 7, characterized in that: According to weight, weigh 13-18 parts of TPU, 1-3 parts of TPR, 1-3 parts of plasticizer, 13-20 parts of degradable filler, and 40-80 parts of biodegradable resin, mix them, heat to 110-125°C, stir for 10-20 minutes, then add 0.5-1.5 parts of foaming agent and 1-3 parts of cross-linking agent, stir evenly to obtain a mixture, and inject molding the mixture to obtain a degradable and environmentally friendly material.

Images