A preparation process for biodegradable and environmentally friendly shoe materials

Abstract

This invention discloses a preparation process for biodegradable and environmentally friendly footwear materials, including the following steps: Step 1, raw material preparation; Step 2, fiber pretreatment; Step 3, starch pretreatment; Step 4, mixing; Step 5, extrusion granulation; Step 6, compression molding; Step 7, post-processing. The advantages of this invention are: footwear materials prepared using biodegradable materials can decompose rapidly in the natural environment, effectively reducing the pollution of soil and water sources caused by traditional non-biodegradable footwear materials, playing a positive role in protecting the ecological environment, promoting sustainable development, possessing excellent breathability and comfort, keeping users' feet dry, improving the wearing experience, optimizing the pretreatment and mixing steps of the materials to ensure full integration of each component, improving the quality stability of the footwear materials, having huge market potential to meet the needs of different consumer groups, leading the industry towards environmental sustainability, and promoting the technological progress and transformation and upgrading of the entire industry.

Description

Technical Field

[0001] This invention relates to the field of footwear material preparation technology, specifically to a preparation process for a biodegradable and environmentally friendly footwear material. Background Technology

[0002] With the increasing severity of global environmental problems and the growing awareness of environmental protection, the demand for environmentally friendly products is becoming increasingly strong. In the footwear industry, traditional shoe materials are usually made of non-degradable synthetic materials, such as plastics and rubber. These materials are difficult to degrade in the natural environment, and long-term accumulation will cause serious pollution to soil and water sources, while also wasting a lot of resources.

[0003] Currently, although some environmentally friendly shoe materials have emerged, they still have many shortcomings in terms of performance, cost, and biodegradability. On the one hand, some so-called environmentally friendly shoe materials claim to be biodegradable, but in reality, they degrade slowly and cannot be completely decomposed within a reasonable time, thus having limited effect on environmental improvement. On the other hand, the manufacturing process of some environmentally friendly shoe materials is complex and costly, making it difficult to promote and apply them on a large scale.

[0004] In addition, traditional non-degradable footwear materials have certain advantages in terms of comfort, breathability, and abrasion resistance, but environmentally friendly footwear materials often cannot match them in these properties. Therefore, developing an environmentally friendly footwear material manufacturing process that has both good degradability and meets people's requirements for footwear material quality and performance has become an urgent problem to be solved in the footwear industry. In order to reduce the pollution of footwear products to the environment and meet people's demand for environmentally friendly and high-performance footwear materials, it is necessary to develop a degradable and environmentally friendly footwear material manufacturing process. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a design that is simple, reliable, and easy to clean.

[0006] A process for preparing biodegradable and environmentally friendly shoe materials that is clean, highly resistant to damage, and relatively low in cost.

[0007] To solve the above-mentioned technical problems, the present invention provides a process for preparing biodegradable and environmentally friendly shoe materials, comprising the following steps:

[0008] Step 1, Raw material preparation: 30-40 parts natural fiber material, 40-50 parts biodegradable polymer, 10-15 parts plant starch, 5-8 parts environmentally friendly plasticizer citrate esters, 2-4 parts coupling agent silane coupling agent, and 1-2 parts antioxidant natural vitamin E;

[0009] Step 2, Fiber Pretreatment: Clean the natural fiber material to remove impurities and dust. Dry the cleaned fiber material in an oven at 60-80℃ for 4-6 hours to reduce its moisture content to below 5%. Crush the dried fiber material to a length of 1-3 mm.

[0010] Step 3, Starch pretreatment: Dry the plant starch at 80-100℃ for 3-5 hours, ensuring that the starch moisture content is below 3%. Grind the dried starch to make the particles uniform in size, with a particle size between 50-100 micrometers.

[0011] Step 4, Mixing: Add the biodegradable polymer to a high-speed mixer and preheat at 70-90℃ for 5-10 minutes. Then, add the pretreated natural fiber material, plant starch, environmentally friendly plasticizer (citric acid esters), coupling agent (silane coupling agent), and antioxidant (natural vitamin E) in sequence. Mix at 90-110℃ and 1000-1500 rpm for 15-25 minutes to obtain a homogeneous mixture.

[0012] Step 5, Extrusion Granulation: The mixture is added to a twin-screw extruder. The temperatures of each section of the extruder are set as follows: Zone 1 120-130℃, Zone 2 130-140℃, Zone 3 140-150℃, Zone 4 150-160℃, and the die head temperature 155-165℃. The material is extruded into strips through the extruder, and then cooled and granulated to obtain biodegradable granules.

[0013] Step 6, Compression Molding: Add the biodegradable granules into the shoe material mold, and preheat the mold to [temperature missing].

[0014] Molding is carried out at 160-180℃ and 10-15MPa for 10-15 minutes. After cooling and demolding, biodegradable and environmentally friendly shoe materials are obtained.

[0015] Step 7, Post-processing: Trim and sand the molded shoe material to remove burrs and excess material. Spray an environmentally friendly waterproofing agent on the surface of the shoe material to enhance its waterproof performance. Place the shoe material in a well-ventilated environment for 24-48 hours to stabilize its performance.

[0016] Preferably, the natural fiber material includes flax fiber and bamboo fiber, and the biodegradable polymer includes polylactic acid and polycaprolactone.

[0017] Preferably, the natural fiber material is one or two of flax fiber and bamboo fiber, with a weight of 30-40 parts, and the biodegradable polymer is one or two of polylactic acid and polycaprolactone, with a weight of 40-50 parts.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The preparation process of the biodegradable and environmentally friendly shoe material of the present invention uses biodegradable materials to prepare shoe materials, which can decompose rapidly in the natural environment, effectively reducing the pollution of soil, water sources and other sources caused by traditional non-biodegradable shoe materials, playing a positive role in the protection of the ecological environment, reducing the shoe material industry's dependence on non-renewable resources such as petroleum, promoting sustainable development, and having high environmental protection performance.

[0020] 2. The biodegradable and environmentally friendly shoe material of the present invention is prepared through a carefully designed process, which makes the shoe material exhibit excellent mechanical properties, strength, toughness and wear resistance, which can meet the needs of daily wear and use, and has excellent breathability and comfort, keeping the user's feet dry and improving the wearing experience.

[0021] 3. The biodegradable and environmentally friendly shoe material preparation process of this invention is unique, simple, and easy to implement for industrial production. It effectively reduces production costs and improves production efficiency. The pretreatment and mixing steps of the materials are optimized to ensure full integration of all components, thereby improving the quality and stability of the shoe material.

[0022] Qualitative;

[0023] 4. The biodegradable and environmentally friendly shoe material preparation process of the present invention has huge market potential, can meet the needs of different consumer groups, provides a new development direction for the shoe material industry, leads the industry towards environmental protection and sustainability, and promotes the technological progress and transformation and upgrading of the entire industry. Detailed Implementation

[0024] Unless the context clearly indicates otherwise, nouns without quantifiers and nouns modified by “the” include singular and plural indicators of persons / kinds.

[0025] As used in the specification and claims, the terms “comprising,” “including,” “having,” “may,” “containing,” and variations thereof are open transitional phrases, terms, or words that require the presence of a specified ingredient / step and allow the presence of other ingredients / steps. However, such a description should be interpreted as also describing the composition or method as consisting of the ingredients / steps listed “by” and “substantially by,” which allows only the specified ingredient / step and any unavoidable impurities that may arise therefrom to be present, and excludes other ingredients / steps.

[0026] The numerical values ​​in the specification and claims of this application should be understood to include the same numerical values ​​when reduced to the same number of significant figures and numerical values ​​that differ from the stated values ​​by less than the experimental error of conventional measurement techniques used to determine the stated values ​​of the type described in this application.

[0027] All ranges disclosed herein include the indicated endpoints and can be combined independently (e.g., the range “2 g to 10 g” includes the endpoints 2 g and 10 g, as well as all intermediate values).

[0028] The terms “approximately” and “approximately” can be used to include any numerical value that can vary without altering its fundamental function. When used with a range, “approximately” and “approximately” also disclose a range defined by the absolute values ​​of its two endpoints; for example, “approximately 2 to approximately 4” also discloses a range of “2 to 4”. Typically, the terms “approximately” and “approximately” can refer to ±10% of the indicated number. However,

[0029] For temperature, the term "approximately" refers to ±1 °C.

[0030] Unless otherwise expressly stated, the percentage of elements shall be considered as the weight percentage of the alloy.

[0031] This disclosure may relate to temperatures for certain method steps. It should be noted that these parameters generally refer to the temperature set by the heat source (such as a furnace), and not necessarily the temperature that the heated material must reach.

[0032] The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0033] Example 1: A preparation process for a biodegradable and environmentally friendly shoe material, comprising the following steps:

[0034] Step 1: Raw material preparation:

[0035] Select 30 parts of natural fiber (such as hemp fiber), 40 parts of starch-based polymer, 30 parts of biodegradable resin, 5 parts of plasticizer (tributyl citrate), and 3 parts of coupling agent (silane coupling agent).

[0036] Step 2, Material Pretreatment:

[0037] The hemp fibers are washed to remove impurities, dried in an oven at 60°C for 4 hours, and then pulverized to reduce the fiber length to about 2 mm.

[0038] Step 3: Mixing

[0039] Starch-based polymer and biodegradable resin are added to a high-speed mixer and preheated at 80°C for 5 minutes. Pretreated hemp fiber, plasticizer and coupling agent are added in sequence and mixed at 90°C and 600 rpm for 20 minutes to obtain a homogeneous mixture.

[0040] Step 4: Hot pressing and molding:

[0041] The mixture is placed into a shoe material mold and hot-pressed at 160℃ and 12MPa for 15 minutes.

[0042] Step 5: Cooling treatment:

[0043] The shoe material, after being hot-pressed, is allowed to cool naturally to room temperature.

[0044] Step Six: Surface Treatment

[0045] An environmentally friendly waterproofing agent is sprayed onto the surface of the shoe material to enhance its waterproof performance.

[0046] Example 2: A preparation process for a biodegradable and environmentally friendly shoe material, comprising the following steps:

[0047] Step 1: Raw material preparation:

[0048] 35 parts natural fiber (bamboo fiber), 35 parts starch-based polymer, 30 parts biodegradable resin, 6 parts plasticizer (acetylated tributyl citrate), and 2 parts coupling agent (titanium ester coupling agent).

[0049] Step 2, Material Pretreatment:

[0050] After cleaning, the bamboo fiber is dried in a 70℃ oven for 3 hours and then pulverized to a fiber length of 1.5 mm.

[0051] Step 3: Mixing

[0052] First, preheat the starch-based polymer and biodegradable resin at 90°C for 8 minutes, then add the pretreated bamboo fiber, plasticizer, and coupling agent, and mix at 95°C at a speed of 700 rpm for 18 minutes.

[0053] Step 4: Hot pressing and molding:

[0054] The mixture is placed in the mold and hot-pressed at 170℃ and 10MPa for 12 minutes.

[0055] Step 5: Cooling treatment:

[0056] Let it cool naturally to room temperature.

[0057] Step Six: Surface Treatment

[0058] Apply environmentally friendly waterproofing agent.

[0059] Example 3: A preparation process for a biodegradable and environmentally friendly shoe material, comprising the following steps:

[0060] Step 1: Raw material preparation:

[0061] 28 parts natural fiber (a mixture of cotton and linen fibers in a 1:1 ratio), 42 parts starch-based polymer, 30 parts biodegradable resin, 4 parts plasticizer (epoxidized soybean oil), and 3 parts coupling agent (silane coupling agent).

[0062] Step 2, Material Pretreatment:

[0063] After washing the mixed fibers, they were dried in an oven at 55°C for 5 hours and then pulverized to a fiber length of 2.5 mm.

[0064] Step 3: Mixing

[0065] Starch-based polymers and biodegradable resins were preheated at 85°C for 6 minutes, and then pretreated mixed fibers, plasticizers, and coupling agents were added. The mixtures were then mixed at 88°C for 22 minutes at a speed of 550 rpm.

[0066] Step 4: Hot pressing and molding:

[0067] The material is placed in the mold and hot-pressed at 155℃ and 13MPa for 14 minutes.

[0068] Step 5: Cooling treatment:

[0069] Let it cool naturally to room temperature.

[0070] Step Six: Surface Treatment

[0071] Apply environmentally friendly waterproofing agent.

[0072] Example 4: A preparation process for a biodegradable and environmentally friendly shoe material

[0073] 1. Weigh out 30 parts of natural rubber, 15 parts of starch, 10 parts of cellulose, 5 parts of plasticizer, 2 parts of coupling agent, and 1 part of antioxidant.

[0074] 2. Dry the starch to reduce its moisture content to below 5%.

[0075] 3. Natural rubber, pretreated starch, cellulose, plasticizer, coupling agent, and antioxidant.

[0076] Add the mixture to a high-speed mixer and mix at 80°C for 20 minutes to obtain the mixture.

[0077] 4. Add the mixture to the internal mixer and mix at 120°C for 25 minutes.

[0078] 5. Add the internally mixed material to a two-roll mill and mix at 80°C for 15 minutes to obtain the rubber compound.

[0079] 6. Add the adhesive to the shoe material molding machine and mold it at a temperature of 150℃ to obtain biodegradable and environmentally friendly shoe material.

[0080] Example 5: A preparation process for a biodegradable and environmentally friendly shoe material

[0081] 1. Weigh out 40 parts of natural rubber, 25 parts of starch, 20 parts of cellulose, 10 parts of plasticizer, 5 parts of coupling agent, and 3 parts of antioxidant.

[0082] 2. Dry the starch to reduce its moisture content to below 5%.

[0083] 3. Add natural rubber, pretreated starch, cellulose, plasticizer, coupling agent and antioxidant to a high-speed mixer and mix at 100℃ for 10 minutes to obtain a mixture.

[0084] 4. Add the mixture to the internal mixer and mix at 140°C for 15 minutes.

[0085] 5. Add the internally mixed material to a two-roll mill and mix at 100°C for 10 minutes to obtain the rubber compound.

[0086] 6. Add the adhesive to the shoe material molding machine and mold it at a temperature of 170℃ to obtain biodegradable and environmentally friendly shoe material.

[0087] Comparative example: Shoe materials were prepared using traditional shoe material manufacturing processes, with synthetic rubber as the main raw material.

[0088] The shoe materials prepared in Examples 4, 5, and the comparative example were subjected to performance tests, and the results are shown in the table below:

[0089] sheet

[0090]

[0091] The test results above show that the biodegradable and environmentally friendly footwear material of this invention exhibits slightly lower mechanical properties such as tensile strength, elongation at break, and tear strength compared to traditional footwear materials, but still meets the requirements for footwear use. Furthermore, the biodegradable and environmentally friendly footwear material of this invention demonstrates significantly shorter degradation time in the natural environment, exhibiting excellent environmental performance.

[0092] The specific steps are as follows: First, the staff weighs the following raw materials in parts by weight: 30-40 parts of natural fiber materials, such as flax fiber and bamboo fiber; 40-50 parts of biodegradable polymers, such as polylactic acid and polycaprolactone; 10-15 parts of plant starch; 5-8 parts of environmentally friendly plasticizers, such as citrate esters; 2-4 parts of coupling agents, such as silane coupling agents; and 1-2 parts of antioxidants, such as natural vitamin E. Then, the staff washes the natural fiber materials to remove impurities and dust, and dries the washed fiber materials in an oven at 60-80℃ for 4-6 hours, reducing the moisture content to below 5%. The dried fiber materials are then pulverized to a length of 1-3 mm. Next, the plant starch is dried at 80-100℃ for 3-5 hours, ensuring the starch moisture content is below 3%. The dried starch is then ground to ensure uniform particle size, with a particle size of 50-100 mm. Between the micrometer and the particle size, the worker adds the biodegradable polymer to a high-speed mixer, preheats it at 70-90℃ for 5-10 minutes, and then sequentially adds pretreated natural fiber materials, plant starch, environmentally friendly plasticizers, coupling agents, and antioxidants. Simultaneously, it is mixed at 90-110℃ and a speed of 1000-1500 rpm for 15-25 minutes to obtain a homogeneous mixture.

[0093] Workers add the mixture to a twin-screw extruder. The extruder temperatures are set as follows: Zone 1 120-130℃, Zone 2 130-140℃, Zone 3 140-150℃, Zone 4 150-160℃, and the die head temperature 155-165℃. The material is extruded into strips, cooled, and pelletized to obtain biodegradable granules. These granules are then added to a shoe material mold, which is preheated to 160-180℃. The mold is then pressed at a pressure of 10-15 MPa for 10-15 minutes. After cooling and demolding, biodegradable and environmentally friendly shoe material is obtained. The molded shoe material is then trimmed and polished to remove burrs and excess material. An environmentally friendly waterproofing agent is sprayed onto the surface of the shoe material to enhance its waterproof performance. Finally, the shoe material is placed in a well-ventilated environment for 24-48 hours to stabilize its properties, thus completing the preparation process of the biodegradable and environmentally friendly shoe material.

[0094] Those skilled in the art should understand that the embodiments of the present invention shown in the above description are merely examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the principles described, the implementation of the present invention can be modified in any way. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. These specific embodiments are merely explanations of this application and are not limitations thereof. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A preparation process for a biodegradable and environmentally friendly shoe material, characterized in that: Includes the following steps: Step 1, Raw material preparation: 30-40 parts natural fiber material, 40-50 parts biodegradable polymer, 10-15 parts plant starch, 5-8 parts environmentally friendly plasticizer citrate esters, 2-4 parts coupling agent silane coupling agent, and 1-2 parts antioxidant natural vitamin E; Step 2, Fiber Pretreatment: Clean the natural fiber material to remove impurities and dust. Dry the cleaned fiber material in an oven at 60-80℃ for 4-6 hours to reduce its moisture content to below 5%. Crush the dried fiber material to a length of 1-3 mm. Step 3, Starch pretreatment: Dry the plant starch at 80-100℃ for 3-5 hours, ensuring that the starch moisture content is below 3%. Grind the dried starch to make the particles uniform in size, with a particle size between 50-100 micrometers. Step 4, Mixing: Add the biodegradable polymer to a high-speed mixer and preheat at 70-90℃ for 5-10 minutes. Then, add the pretreated natural fiber material, plant starch, environmentally friendly plasticizer (citric acid esters), coupling agent (silane coupling agent), and antioxidant (natural vitamin E) in sequence. Mix at 90-110℃ and 1000-1500 rpm for 15-25 minutes to obtain a homogeneous mixture. Step 5, Extrusion Granulation: The mixture is added to a twin-screw extruder. The temperatures of each section of the extruder are set as follows: Zone 1 120-130℃, Zone 2 130-140℃, Zone 3 140-150℃, Zone 4 150-160℃, and the die head temperature 155-165℃. The material is extruded into strips through the extruder, and then cooled and granulated to obtain biodegradable granules. Step 6, Compression Molding: Add biodegradable granules into the shoe material mold, preheat the mold to 160-180℃, and perform compression molding under a pressure of 10-15MPa for 10-15 minutes. After cooling and demolding, biodegradable and environmentally friendly shoe material is obtained. Step 7, Post-processing: Trim and sand the molded shoe material to remove burrs and excess material. Spray an environmentally friendly waterproofing agent on the surface of the shoe material to enhance its waterproof performance. Place the shoe material in a well-ventilated environment for 24-48 hours to stabilize its performance.

2. The preparation process of a biodegradable and environmentally friendly shoe material according to claim 1, characterized in that: The natural fiber materials include flax fiber and bamboo fiber, and the biodegradable polymers include polylactic acid and polycaprolactone.

3. The preparation process of a biodegradable and environmentally friendly shoe material according to claim 1, characterized in that: The natural fiber material is one or two of flax fiber and bamboo fiber, with a weight of 30-40 parts; the biodegradable polymer is one or two of polylactic acid and polycaprolactone, with a weight of 40-50 parts.

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