Manufacturing method of upper-pulling waterproof shoes

Abstract

The invention discloses a manufacturing method of upper-pulling waterproof shoes. The manufacturing method sequentially comprises the following steps: shoe upper pretreatment: selecting shoe upper fabric, performing waterproof agent dipping or coating pretreatment on the shoe upper fabric, and airing the shoe upper fabric in a ventilated and dry environment at 25-35 DEG C for 2-4 hours after pretreatment. By means of the full-process waterproof design of shoe upper pretreatment, precise upper pulling sewing, waterproof layer compositing and upper sole full coating and sealing, material selection and collaborative optimization of technological parameters are combined, and the technical problems of water seepage of needle holes at sewing lines of traditional upper pulling shoes and water seepage of gaps of upper sole combination seams are effectively solved; the waterproof grade of the finished product can reach IPX7 or above, and the use requirements in outdoor and humid environments can be met.

Description

Technical Field

[0001] This invention relates to the field of waterproof shoe technology, and specifically to a method for manufacturing a gusseted waterproof shoe. Background Technology

[0002] Lace-up shoes are widely used in everyday wear and outdoor settings due to their advantages such as a tight fit between the upper and the last, comfortable wear, and sturdy structure. However, the traditional manufacturing process of lace-up shoes has two major shortcomings in waterproofing: first, during the lace-up process, tiny pinholes are formed at the seams, allowing water molecules to easily seep into the shoe; second, the sealing process at the joint between the upper and the sole is not perfect, and the adhesive is not tightly bonded, making it prone to water seepage.

[0003] In existing technologies, to improve the waterproof performance of zip-up shoes, waterproof coatings are often applied to the surface of the upper or waterproof linings are added inside the shoe. However, these methods have significant drawbacks: applying only a surface waterproof coating cannot solve the problem of water seepage at the seams and the joint between the upper and the sole, resulting in limited waterproofing; adding a waterproof lining reduces the breathability of the shoe, leading to stuffiness, and the lining's fit to the upper and sole is poor, making it prone to falling off after long-term wear, affecting the shoe's durability. Furthermore, the existing zip-up sewing process lacks precise control over parameters such as stitch length and tension, resulting in a loose fit between the upper and the last, further increasing the risk of water seepage at the seams, and the process stability is poor, making it difficult to meet the needs of industrial mass production.

[0004] Therefore, developing a method for making waterproof shoes with uppers that can effectively solve the problems of water seepage at seams and the joint between the upper and the sole, while also ensuring breathability and durability, and with a simple, controllable, and mass-producible process, has become an urgent technical problem to be solved in the current footwear industry. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the purpose of this invention is to provide a method for manufacturing waterproof shoes with uppers, so as to solve the problems mentioned in the background art.

[0006] The present invention solves the technical problem by adopting the following technical solution: This invention provides a method for manufacturing waterproof shoes with uppers, comprising the following steps: Step 1: Upper pretreatment: Select upper material and pretreat it by impregnation or coating with a waterproofing agent. After pretreatment, place the upper material in a ventilated and dry environment at 25-35℃ for 2-4 hours to dry. Step 2: Upper sewing process: Place the pre-treated upper material onto the shoe last, adjust it to fit tightly, and then use waterproof thread to sew the upper. Control the stitch length to be 0.8-1.2mm and the sewing tension to be 3-5N. After sewing, remove excess thread. Step 3: Applying the waterproof layer; Step 4: Upper-sole sealing treatment: Align the composite upper with the sole, apply water-based polyurethane adhesive along the joint to a thickness of 0.2-0.3 mm, apply pressure of 0.4-0.6 MPa, and then place in an environment of 25-35℃ for pressure curing for 3-5 hours; Step 5: Finishing process: Trim, clean, shape, inspect and package the shoe body to complete the production of the waterproof shoe.

[0007] Preferably, the specific process for the composite waterproof layer is as follows: Select a 0.3-0.8mm thick polymer waterproof membrane and use a hot-press bonding process to bond the polymer waterproof membrane to the inside or outside of the shoe upper. After bonding, place it in an environment of 30-40℃ for constant temperature curing for 1-2 hours.

[0008] Preferably, the polymer waterproof membrane has the following formula by weight: 45-55 parts polyvinyl chloride resin, 15-25 parts acrylate copolymer, 3-8 parts modified nano silica, 2-5 parts polyethylene glycol, 1-2 parts antioxidant, 0.5-1.5 parts ultraviolet absorber, 8-12 parts plasticizer, and 5-8 parts modified nano cellulose agent.

[0009] Preferably, the antioxidant is antioxidant 1010; the ultraviolet absorber is ultraviolet absorber UV-327; the plasticizer is dioctyl phthalate; and the glass transition temperature of the acrylate copolymer is -20 to -10°C.

[0010] Preferably, the modification method of the modified nano-silica is as follows: S1: Preheat nano-silica at 60-65℃ for 1 hour to obtain preheated nano-silica. Mix 5-8 parts of preheated nano-silica, 2-5 parts of montmorillonite, 1-3 parts of zeolite powder and 5-8 parts of sodium citrate solution with a mass fraction of 8-10% thoroughly to obtain nano-silica mixture. S2: Mix 2-3 parts of silane coupling agent KH560, 5-8 parts of 85% ethanol aqueous solution and 1-2 parts of 5% chitosan solution evenly to obtain silane solution; Mix 2-5 parts of β-cyclodextrin, 1-3 parts of calcined talc powder and 5-8 parts of sodium silicate solution with a mass fraction of 5% to obtain β-cyclodextrin agent; stir silane solution and β-cyclodextrin agent at a weight ratio of 3:(5-7) to obtain silane-β-cyclodextrin additive. S3: 3-5 parts illite powder, 2-5 parts silane-β-cyclodextrin additive and 1-2 parts kaolin are mixed thoroughly to obtain functional additive; the nano silica mixture and functional additive are ball-milled at a weight ratio of (8-11):5 at a speed of 1000-1500 r / min for 2 h, then filtered and dried to obtain modified nano silica.

[0011] Preferably, the modified nanocellulose agent is prepared by: S11: Mix 5-8 parts of nanocellulose, 3-5 parts of 5% sodium alginate solution and 1-3 parts of 2-5% sodium dodecylbenzenesulfonate solution evenly to obtain nanocellulose solution. S12: Mix 2-5 parts of nano titanium dioxide, 1-3 parts of maifan stone powder and 2-5 parts of lanthanum chloride solution evenly to obtain nano titanium dioxide agent; ball mill hydroxyapatite and nano titanium dioxide agent at a weight ratio of (7-11):5, ball milling speed 1000-1500 r / min for 2 h to obtain ball milling fluid; S13: The nanocellulose liquid and the ball milling liquid are stirred at a weight ratio of 2:(5-8), the stirring temperature is 55-60℃, the stirring speed is 450-500r / min, and the stirring time is 1h. After stirring, the mixture is filtered and dried to obtain the modified nanocellulose agent.

[0012] Specific beneficial effects of modified nano-silica and modified nano-cellulose agents The specific beneficial effects of modified nano-silica: After being modified by a composite of silane coupling agent KH560 and β-cyclodextrin, its surface activity is significantly improved, and its compatibility with polyvinyl chloride materials and acrylate copolymers is greatly improved. It can be uniformly dispersed in the waterproof membrane system, avoiding local defects in the waterproof membrane caused by the agglomeration of traditional nano-silica. At the same time, the modified nano-silica has both excellent filling and reinforcing effects and hydrophobic properties. It can improve the tensile strength, bending resistance and abrasion resistance of the waterproof membrane, reduce the risk of damage to the waterproof membrane during the bending process of the shoe body, and further seal the micropores inside the waterproof membrane to improve waterproof sealing. It also works with polyethylene glycol to achieve a balance between waterproofing and breathability. In addition, the montmorillonite, zeolite powder and other additives added during the modification process can enhance the dispersion stability of nano-silica, extend the aging resistance of the waterproof membrane, and ensure that the shoe body can still maintain excellent waterproof performance after long-term use.

[0013] The specific beneficial effects of modified nanocellulose agents are as follows: Through the composite modification of nanocellulose with nano titanium dioxide and hydroxyapatite, its fiber structure is more stable, and a modified layer with hydrophilic-hydrophobic balance is formed on the surface, significantly improving the bonding force with the waterproof membrane substrate. On the one hand, the fibrous structure of the modified nanocellulose agent can build breathable channels, and in combination with polyethylene glycol, it further optimizes the breathability of the waterproof membrane, solving the pain point of traditional waterproof membranes being "waterproof but not breathable" and improving the comfort of the shoe. On the other hand, it can work synergistically with modified nano silica to form a three-dimensional reinforcing network, further improving the flexural strength, tensile strength, and tear strength of the waterproof membrane, preventing the waterproof membrane from being damaged due to long-term bending and friction. At the same time, the modified nanocellulose agent has good biocompatibility and environmental friendliness, which can reduce the environmental burden of the waterproof membrane and improve the adhesion strength between the waterproof membrane and the shoe upper fabric, preventing the waterproof membrane from falling off.

[0014] Preferably, the waterproofing agent in step 1 is a water-based polyurethane waterproofing agent, the immersion pretreatment time is 20-30 minutes, and the coating thickness of the coating pretreatment is 0.1 mm.

[0015] Preferably, the waterproof seam thread in step 2 is nylon waterproof seam thread, and there are no skipped stitches, missing stitches, or loose stitches during the sewing process.

[0016] Preferably, the parameters of the hot-press bonding process are: hot-press temperature 80-100℃, hot-press pressure 0.3-0.5MPa, and hot-press time 15-30s; The parameters for the shaping process in step 5 are as follows: place the shoe body on the shoe last and place it in a shaping box at 40-50℃ for 30-60 minutes.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention addresses the core problem of water seepage: Through a complete waterproof design that combines "shoe upper pretreatment + precise lasting and sewing + waterproof layer composite + full coating and sealing of the upper and sole," and by optimizing material selection and process parameters, this invention effectively solves the technical problems of water seepage through pinholes at the seams of traditional lasted shoes and water seepage through the seams between the upper and sole. The finished product has a waterproof rating of IPX7 or higher, which can meet the needs of outdoor and humid environments.

[0018] Balancing breathability and durability: An optimized polymer waterproof membrane is selected as the waterproof layer. This is achieved through a rational formulation of components such as polyvinyl chloride resin, acrylate copolymer, modified nano-silica, and modified nano-cellulose agent. The modified nano-silica is modified with silane coupling agent KH560 and β-cyclodextrin, improving compatibility with the substrate, enhancing the membrane's structural strength, and improving its waterproof sealing. The modified nano-cellulose agent, prepared by combining nano-cellulose with nano-titanium dioxide and hydroxyapatite, optimizes the membrane's breathability, flexibility, and adhesion. The synergistic effect of these two components results in a waterproof membrane that not only possesses excellent waterproof properties (hydrostatic pressure ≥80kPa) and breathability (breathability ≥1.8mm / s), but also significantly improves flexural strength (≥50,000 cycles), tensile strength (≥18MPa), and compatibility with shoe uppers. The bonding strength is ≥8.5N / 25mm. Through multiple comparative verifications, it was found that without the addition of the two modified materials, deviations in the modification process parameters, or the absence of silane-β-cyclodextrin additives in the modified nano-silica, the absence of ball milling fluid in the modified nano-cellulose agent, or different preparation conditions, the various properties of the waterproof membrane all decreased significantly, showing a clear deterioration trend. This further proves the necessity of the two modified materials, their key components, and the corresponding processes. Combined with water-based polyurethane waterproofing agent pretreatment, it achieves all-round waterproofing while avoiding the stuffy and hot problem of the shoe body caused by traditional waterproofing treatment. Precise control of the lasting and sewing parameters, waterproof layer composite parameters, and upper and sole sealing parameters ensures a tight fit between the upper and the last, a firm fit between the waterproof membrane and the upper, and a tight bond between the upper and the sole, further improving the structural durability of the shoe body and extending its service life.

[0019] The process is simple and controllable: the various processes of this invention are smoothly connected, the process parameters are clear and can be precisely controlled, no complicated special equipment is required, it is compatible with existing shoe production lines, can realize industrialized mass production, reduce production costs, improve production efficiency, and the product quality is stable with a high pass rate.

[0020] High compatibility and wide applicability: The manufacturing method of this invention can be adapted to a variety of shoe upper materials and sole materials, and can be used to make various types of zippered shoes such as casual zippered shoes, outdoor zippered shoes, and work zippered shoes. It has a wide range of applications and has strong practicality and promotional value. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 A method for manufacturing waterproof shoes with uppers includes the following steps: Step 1: Pre-treatment of shoe uppers Select canvas shoe upper fabric and pre-treat it with water-based polyurethane waterproofing agent. Immerse the canvas shoe upper fabric completely in the waterproofing agent for 30 minutes to ensure that the waterproofing agent penetrates evenly into the gaps between the fabric fibers. After immersion, remove the shoe upper fabric, drain excess waterproofing agent, and place it in a 30℃, ventilated and dry environment to air dry for 3 hours, until there are no obvious water stains and no accumulation of waterproofing agent on the surface of the shoe upper fabric.

[0023] Step 2: Lacing and sewing process The pre-treated canvas upper is fitted onto the corresponding size shoe last, and the position of the upper is adjusted to ensure that the upper fits the shoe last tightly without wrinkles. The upper is then sewn using an industrial sewing machine with nylon waterproof thread, the stitch length is controlled at 1.0mm, and the sewing tension is 4N. During the sewing process, the thread is kept even and taut to avoid skipped stitches or loose threads. After sewing, excess thread ends are trimmed and the smoothness of the seams is checked.

[0024] Step 3: Waterproof layer lamination An optimized polymer waterproof membrane with a thickness of 0.5 mm was selected (the formula and modification process are completely consistent with those of Example 1 of the waterproof layer: 50 parts polyvinyl chloride resin, 20 parts acrylate copolymer, 5 parts modified nano silica, 3 parts polyethylene glycol, 1.5 parts antioxidant, 1 part ultraviolet absorber, 10 parts plasticizer, and 6 parts modified nanocellulose agent. The modified nano silica and modified nanocellulose agent were prepared according to the process of Example 1 of the waterproof layer, and the modified nanocellulose agent was 6 parts). The modified nano silica was modified using a special method, and the modified nanocellulose agent was prepared according to the corresponding preparation process. The waterproof membrane was laminated to the inside of the shoe upper using a hot-pressing process. A flatbed hot press was selected as the hot-pressing equipment, with the hot-pressing temperature set at 90℃, the hot-pressing pressure at 0.4MPa, and the hot-pressing time at 20s. After hot pressing, the shoe upper was placed in an environment of 35℃ for constant temperature curing for 1.5h to ensure that the waterproof membrane and the shoe upper were tightly bonded without bubbles. Testing showed that the bonding strength between the waterproof membrane and the canvas upper in this embodiment reached 9.2 N / 25 mm, the hydrostatic pressure reached 88 kPa, and the air permeability reached 2.1 mm / s. Compared with the corresponding ratio (without added modified materials and process deviation), the performance advantages of each aspect are significant, providing a solid guarantee for the waterproof performance of the shoe body.

[0025] Step 4: Sealing treatment of shoe upper and sole Remove the sewn and bonded upper from the shoe last and align it with the rubber sole. Apply waterproof adhesive along the seam between the upper and sole to a thickness of 0.25mm, ensuring that the adhesive completely covers the seam and the surrounding 1.5mm area. After application, apply 0.5MPa pressure using a pressure clamp and place in a 30℃, well-ventilated, and dry environment for 4 hours to cure under pressure until the adhesive is completely cured.

[0026] Step 5: Post-processing The shoe body is trimmed to remove excess adhesive and loose threads; the surface of the shoe body is wiped with a neutral detergent to remove stains; the shoe body is reattached to the shoe last and placed in a 45℃ shaping box for 45 minutes to set; after setting, the shoe body is tested for waterproof performance (using the IPX7 waterproof test standard), sewing quality, and bonding quality. Qualified finished products are selected, packaged, and the production is completed.

[0027] The waterproof shoes produced in this embodiment have an IPX7 waterproof rating. There is no water seepage at the seams and the joint between the upper and the sole. The shoes are breathable, comfortable to wear, and have a sturdy structure. After 10,000 bending tests, the waterproof membrane did not peel off and the seams did not break. They are highly durable and suitable for outdoor hiking.

[0028] The preparation method of the polymer waterproof membrane (applicable to all waterproof layer examples and formulations) is as follows: S1: Raw material pretreatment: Place polyvinyl chloride resin (PVC) in a constant temperature drying oven at 65℃ for 3 hours to remove moisture from the resin and avoid the generation of bubbles during the preparation process; place acrylate copolymer (BA-MMA copolymer), antioxidant, ultraviolet absorber, and plasticizer in an environment at 30℃ for 30 minutes to ensure that the temperature of each component is consistent and facilitates uniform mixing; after the modified nano-silica and modified nano-cellulose agent are prepared according to the corresponding modification process, they are pulverized to a particle size of 50-100nm and set aside; polyethylene glycol does not require pretreatment and can be used directly. S2: Mixing and stirring: Add the pretreated polyvinyl chloride resin, acrylate copolymer, and plasticizer to a high-speed mixer, set the mixing speed to 1000 r / min, the mixing temperature to 90℃, and stir for 40 min until the mixture is uniform, free of particles and lumps; then add polyethylene glycol, antioxidant, and UV absorber, adjust the mixing speed to 800 r / min, and continue stirring for 30 min to ensure that the functional additives are uniformly dispersed in the system; finally, slowly add the pretreated modified nano-silica and modified nano-cellulose agent, adjust the mixing speed to 1200 r / min, and stir for 50 min. During this period, stop the machine every 10 min to check the mixing uniformity to avoid agglomeration of modified components and ensure that all components are fully integrated to obtain a uniform waterproof membrane mixture.

[0029] S3: Melt Plasticization: The uniformly mixed waterproof membrane material is fed into a twin-screw extruder for melt plasticization. The temperatures of each section of the extruder are set as follows: feed section 150℃, melting section 170℃, die head section 160℃, screw speed 300r / min, and melt plasticization time 15min to ensure that the material is completely melted and uniformly plasticized without any unmelted particles, thus obtaining a molten waterproof membrane material.

[0030] S4: Extrusion calendering: The molten waterproof membrane material is extruded through the extruder head and fed into the calender for calendering. The calender is set to a temperature of 160℃ and a calendering speed of 2m / min. The gap between the calendering rollers is adjusted according to the required waterproof membrane thickness (0.5mm). During the calendering process, the calendering rollers are kept at a uniform speed to avoid defects such as uneven thickness and surface wrinkling, and a preliminary waterproof membrane blank is obtained.

[0031] S5: Cooling and Shaping: The calendered waterproof membrane blank is fed into the cooling roller group for cooling and shaping. The temperature of the cooling roller is controlled at 35℃ and the cooling time is 15s to ensure that the waterproof membrane blank is quickly cooled to room temperature. The waterproof membrane after shaping has a uniform thickness and a smooth surface. During the cooling process, a slight pressure of 0.2MPa can be applied to improve the surface smoothness of the waterproof membrane.

[0032] S6: Cutting Inspection: Cut the cooled and shaped waterproof membrane into a shape that matches the size of the shoe upper. Avoid rough edges and damage during the cutting process. Then, conduct a performance test on the cut waterproof membrane. The test indicators include hydrostatic pressure, air permeability, number of flexural cycles, tensile strength, etc. If the test is qualified, it is a polymer waterproof membrane.

[0033] Example 2 A method for manufacturing waterproof shoes with uppers includes the following steps: Step 1: Pre-treatment of shoe uppers Select leather shoe upper material and pre-treat the leather shoe upper material with water-based polyurethane waterproofing agent. Apply the waterproofing agent evenly to the leather surface by spraying, with a spray thickness of 0.1mm, ensuring no missed spraying and no accumulation. After spraying, place it in a 25℃, ventilated and dry environment to dry for 4 hours until the leather surface is dry.

[0034] Step 2: Lacing and sewing process The pre-treated leather upper is placed on the shoe last, and the fit is adjusted. The upper is then sewn using an industrial sewing machine with nylon waterproof thread. The stitch length is controlled at 0.8mm and the sewing tension is 3N to ensure that the stitches are flat and strong. After sewing, the thread ends are trimmed and the seams are checked for loose or missing threads.

[0035] Step 3: Waterproof layer lamination An optimized polymer waterproof membrane with a thickness of 0.3 mm was selected (the formula and modification process are completely consistent with those of Example 2 of the waterproof layer: 45 parts polyvinyl chloride resin, 25 parts acrylate copolymer, 3 parts modified nano silica, 2 parts polyethylene glycol, 1 part antioxidant, 0.5 parts ultraviolet absorber, 8 parts plasticizer, and 5 parts modified nanocellulose agent. The modified nano silica and modified nanocellulose agent are prepared according to the process of Example 2 of the waterproof layer, and the modified nanocellulose agent is 5 parts). The modified nano silica is modified using a special method, and the modified nanocellulose agent is prepared according to the corresponding preparation process. The waterproof membrane is laminated to the outside of the shoe upper using a coating process. First, the adhesive is evenly coated on the outside of the shoe upper with a coating thickness of 0.1 mm. Then, the optimized polymer waterproof membrane is adhered to the adhesive surface, and a pressure of 0.2 MPa is applied and maintained for 20 seconds. After lamination, it is placed in an environment of 30°C for constant temperature curing for 2 hours to ensure that the waterproof membrane is tightly adhered to the shoe upper. Testing showed that the bonding strength between the waterproof membrane and the leather upper in this embodiment reached 8.8 N / 25 mm, the hydrostatic pressure reached 82 kPa, and the air permeability reached 1.9 mm / s. It balances waterproof performance with the breathability and texture of the leather fabric, and the performance is significantly improved compared to the control group without modified materials.

[0036] Step 4: Sealing treatment of shoe upper and sole Align the upper with the EVA sole, apply adhesive along the seam to a thickness of 0.2 mm, covering the seam and the surrounding 1 mm area; after application, apply a pressure of 0.4 MPa and place in a 25°C, well-ventilated, and dry environment for 5 hours to cure under pressure until the adhesive is cured.

[0037] Step 5: Post-processing Trim the edges to remove excess adhesive and burrs, and wipe the surface of the shoe with leather cleaner; place the shoe body on the shoe last and place it in a 40℃ shaping box for 60 minutes to shape; after passing the inspection, package and store it.

[0038] The waterproof shoes produced in this embodiment have an IPX8 waterproof rating, demonstrating excellent waterproof performance. The leather upper combined with a waterproof membrane offers both breathability and a premium feel, making them suitable for daily wear in damp environments. After 8,000 bending tests, there was no water leakage or component detachment.

[0039] Example 3 A method for manufacturing waterproof shoes with uppers includes the following steps: Step 1: Pre-treatment of shoe uppers Select knitted shoe upper fabric and pre-treat it with water-based polyurethane waterproofing agent for 20 minutes. After soaking, remove it and drain it. Place it in a 35℃, ventilated and dry environment to air dry for 2 hours to ensure that the fabric is fully dry and the waterproofing agent is evenly applied.

[0040] Step 2: Lacing and sewing process The knitted upper is fitted onto the shoe last, adjusted to fit without wrinkles, and sewn using an industrial sewing machine with waterproof nylon thread. The stitch length is controlled at 1.2mm, and the sewing tension is 5N to ensure the stitches are strong and without skipped stitches. After sewing, the thread ends are trimmed.

[0041] Step 3: Waterproof layer lamination An optimized polymer waterproof membrane with a thickness of 0.8 mm was selected (the formula and modification process are completely consistent with those of Example 3 of the waterproof layer: 55 parts polyvinyl chloride resin, 15 parts acrylate copolymer, 8 parts modified nano silica, 5 parts polyethylene glycol, 2 parts antioxidant, 1.5 parts ultraviolet absorber, 12 parts plasticizer, and 8 parts modified nanocellulose agent. The modified nano silica and modified nanocellulose agent were prepared according to the process of Example 3 of the waterproof layer, and the modified nanocellulose agent was 8 parts). The modified nano silica was modified using a special method, and the modified nanocellulose agent was prepared according to the corresponding preparation process. The membrane was laminated to the inside of the shoe upper using a hot-pressing bonding process. The hot-pressing temperature was 100℃, the hot-pressing pressure was 0.5MPa, and the hot-pressing time was 15s. After hot pressing, the membrane was placed in an environment of 40℃ for constant temperature curing for 1 hour to ensure a tight bond. Testing showed that the bonding strength between the waterproof membrane and the knitted upper in this embodiment reached 9.5 N / 25 mm, the hydrostatic pressure reached 92 kPa, and the air permeability reached 2.3 mm / s. This meets the high breathability requirements of knitted fabrics and improves the waterproof durability of the shoe body. Compared with the comparison ratio with process deviation, the bending resistance and tensile strength are significantly superior.

[0042] Step 4: Sealing treatment of shoe upper and sole Align the upper with the polyurethane sole, apply adhesive along the joint to a thickness of 0.3 mm, covering the joint and a 2 mm surrounding area; apply a pressure of 0.6 MPa and place in an environment of 35°C for 3 hours to cure under pressure until the adhesive is cured.

[0043] Step 5: Post-processing Trim and clean the shoe body, then place the shoe body onto the shoe last and place it in a 50℃ shaping box for 30 minutes to set; after passing the inspection, the packaging is completed.

[0044] The waterproof shoes manufactured in this embodiment have an IPX7 waterproof rating, excellent breathability of the knitted fabric, are suitable for outdoor sports, have a sturdy structure, stable waterproof performance, and can meet the needs of long-term outdoor use.

[0045] Waterproof layer Example 1 Waterproof membrane formula (by weight): 50 parts polyvinyl chloride resin, 20 parts acrylate copolymer, 5 parts modified nano silica, 3 parts polyethylene glycol, 1.5 parts antioxidant, 1 part ultraviolet absorber, 10 parts plasticizer, and 6 parts modified nano cellulose agent.

[0046] The modified nano-silica preparation process is as follows: S1: Preheat nano-silica at 62℃ for 1 hour, then mix 6 parts of the preheated nano-silica, 3 parts of montmorillonite, 2 parts of zeolite powder, and 6 parts of 9% sodium citrate solution thoroughly to obtain a nano-silica mixture; S2: Mix 2.5 parts of silane coupling agent KH560, 6 parts of 85% ethanol aqueous solution, and 1.5 parts of 5% chitosan solution evenly to obtain a silane solution; then mix 3 parts of β-cyclodextrin, 2 parts of calcined talc powder, and... Six parts of a 5% sodium silicate solution were mixed evenly to obtain a β-cyclodextrin agent; silane solution and β-cyclodextrin agent were stirred thoroughly at a weight ratio of 3:6 to obtain a silane-β-cyclodextrin additive; S3: 4 parts illite powder, 3 parts silane-β-cyclodextrin additive and 1.5 parts kaolin were mixed thoroughly to obtain a functional additive; nano-silica mixture and functional additive were ball-milled at a weight ratio of 10:5 at a ball milling speed of 1200 r / min for 2 h, filtered and dried to obtain modified nano-silica.

[0047] Preparation process of modified nanocellulose agent: S11: Take 6 parts of nanocellulose, 4 parts of 5% sodium alginate solution and 2 parts of 3% sodium dodecylbenzenesulfonate solution and mix them evenly to obtain nanocellulose solution; S12: Take 3 parts of nano titanium dioxide, 2 parts of maifanite powder and 3 parts of lanthanum chloride solution and mix them evenly to obtain nano titanium dioxide agent; hydroxyapatite and nano titanium dioxide agent are ball-milled at a weight ratio of 9:5, ball milling speed of 1200 r / min for 2 h to obtain ball milling liquid; S13: Nanocellulose solution and ball milling liquid are stirred at a weight ratio of 2:6, stirring temperature of 58℃, stirring speed of 480 r / min for 1 h, then filtered and dried to obtain modified nanocellulose agent.

[0048] Waterproof membrane preparation: The above-mentioned formulation components are mixed evenly, and then extruded and calendered to obtain a polymer waterproof membrane with a thickness of 0.5 mm. Its performance test results are as follows: hydrostatic pressure 88 kPa, air permeability 2.1 mm / s, bending resistance 55,000 times (-20℃~25℃), tensile strength 19 MPa, and bonding strength with shoe upper fabric 9.2 N / 25 mm.

[0049] Waterproof layer Example 2 Waterproof membrane formula (by weight): 45 parts polyvinyl chloride resin, 25 parts acrylate copolymer, 3 parts modified nano silica, 2 parts polyethylene glycol, 1 part antioxidant, 0.5 parts ultraviolet absorber, 8 parts plasticizer, and 5 parts modified nano cellulose agent.

[0050] The modified nano-silica preparation process is as follows: S1: Preheat nano-silica at 60℃ for 1 hour, then mix 5 parts of the preheated nano-silica, 2 parts of montmorillonite, 1 part of zeolite powder, and 5 parts of 8% sodium citrate solution thoroughly to obtain a nano-silica mixture; S2: Mix 2 parts of silane coupling agent KH560, 5 parts of 85% ethanol aqueous solution, and 1 part of 5% chitosan solution evenly to obtain a silane solution; then mix 2 parts of β-cyclodextrin, 1 part of calcined talc powder, and... Five parts of a 5% sodium silicate solution were mixed evenly to obtain a β-cyclodextrin agent; silane solution and β-cyclodextrin agent were stirred thoroughly at a weight ratio of 3:5 to obtain a silane-β-cyclodextrin additive; S3: 3 parts illite powder, 2 parts silane-β-cyclodextrin additive and 1 part kaolin were mixed thoroughly to obtain a functional additive; nano-silica mixture and functional additive were ball-milled at a weight ratio of 8:5 at a ball milling speed of 1000 r / min for 2 h, filtered and dried to obtain modified nano-silica.

[0051] Preparation process of modified nanocellulose agent: S11: Take 5 parts of nanocellulose, 3 parts of 5% sodium alginate solution and 1 part of 2% sodium dodecylbenzenesulfonate solution and mix them evenly to obtain nanocellulose solution; S12: Take 2 parts of nano titanium dioxide, 1 part of maifanite powder and 2 parts of lanthanum chloride solution and mix them evenly to obtain nano titanium dioxide agent; hydroxyapatite and nano titanium dioxide agent are ball-milled at a weight ratio of 7:5, ball milling speed of 1000 r / min for 2 h to obtain ball milling liquid; S13: Nanocellulose solution and ball milling liquid are stirred at a weight ratio of 2:5, stirring temperature of 55℃, stirring speed of 450 r / min for 1 h, filtered and dried to obtain modified nanocellulose agent.

[0052] Waterproof membrane preparation: The above-mentioned formula components are mixed evenly, and then extruded and calendered to obtain a polymer waterproof membrane with a thickness of 0.3 mm. Its performance test results are as follows: hydrostatic pressure 82 kPa, air permeability 1.9 mm / s, bending resistance 52,000 times (-20℃~25℃), tensile strength 18 MPa, and bonding strength with shoe upper fabric 8.8 N / 25 mm.

[0053] Waterproof layer Example 3 Waterproof membrane formula (by weight): 55 parts polyvinyl chloride resin, 15 parts acrylate copolymer, 8 parts modified nano silica, 5 parts polyethylene glycol, 2 parts antioxidant, 1.5 parts ultraviolet absorber, 12 parts plasticizer, and 8 parts modified nano cellulose agent.

[0054] The modified nano-silica preparation process is as follows: S1: Preheat nano-silica at 65℃ for 1 hour, then mix 8 parts of the preheated nano-silica, 5 parts of montmorillonite, 3 parts of zeolite powder, and 8 parts of 10% sodium citrate solution thoroughly to obtain a nano-silica mixture; S2: Mix 3 parts of silane coupling agent KH560, 8 parts of 85% ethanol aqueous solution, and 2 parts of 5% chitosan solution evenly to obtain a silane solution; then mix 5 parts of β-cyclodextrin, 3 parts of calcined talc powder, and... Eight parts of a 5% sodium silicate solution were mixed evenly to obtain a β-cyclodextrin agent; silane solution and β-cyclodextrin agent were stirred thoroughly at a weight ratio of 3:7 to obtain a silane-β-cyclodextrin additive; S3: 5 parts illite powder, 5 parts silane-β-cyclodextrin additive and 2 parts kaolin were mixed thoroughly to obtain a functional additive; nano-silica mixture and functional additive were ball-milled at a weight ratio of 11:5 at a ball milling speed of 1500 r / min for 2 h, filtered and dried to obtain modified nano-silica.

[0055] Preparation process of modified nanocellulose agent: S11: Take 8 parts of nanocellulose, 5 parts of 5% sodium alginate solution and 3 parts of 5% sodium dodecylbenzenesulfonate solution and mix them evenly to obtain nanocellulose solution; S12: Take 5 parts of nano titanium dioxide, 3 parts of maifanite powder and 5 parts of lanthanum chloride solution and mix them evenly to obtain nano titanium dioxide agent; hydroxyapatite and nano titanium dioxide agent are ball-milled at a weight ratio of 11:5, ball milling speed of 1500 r / min for 2 h to obtain ball milling liquid; S13: Nanocellulose solution and ball milling liquid are stirred at a weight ratio of 2:8, stirring temperature of 60℃, stirring speed of 500 r / min for 1 h, filtered and dried to obtain modified nanocellulose agent.

[0056] Waterproof membrane preparation: The above-mentioned formulation components are mixed evenly, and then extruded and calendered to obtain a polymer waterproof membrane with a thickness of 0.8 mm. Its performance test results are as follows: hydrostatic pressure 92 kPa, air permeability 2.3 mm / s, bending resistance 60,000 times (-20℃~25℃), tensile strength 20 MPa, and bonding strength with shoe upper fabric 9.5 N / 25 mm.

[0057] Comparative Example 1 (without added modified nanocellulose agent, otherwise consistent with Example 1 of waterproof layer) Waterproof membrane formula (by weight): 50 parts polyvinyl chloride resin, 20 parts acrylate copolymer, 5 parts modified nano silica, 3 parts polyethylene glycol, 1.5 parts antioxidant, 1 part ultraviolet absorber, 10 parts plasticizer (6 parts modified nano cellulose agent are removed).

[0058] The preparation process of the modified nano-silica and the preparation process of the waterproof membrane are completely the same as those in Example 1 of the waterproof layer.

[0059] Performance test results: hydrostatic pressure 75kPa, air permeability 1.4mm / s, flexural strength 38,000 cycles (-20℃~25℃), tensile strength 15MPa, and bonding strength with upper fabric 7.2N / 25mm.

[0060] Conclusion: Without the addition of modified nanocellulose agent, the air permeability, flexural resistance, tensile strength and bonding strength of the waterproof membrane all decreased significantly, with air permeability decreasing by 33.3% and flexural resistance decreasing by 30.9%. This indicates that modified nanocellulose agent is crucial for optimizing the air permeability and enhancing the overall performance of the waterproof membrane.

[0061] Comparative Example 2 (without added modified nano-silica, otherwise the same as in Example 1 of waterproof layer) Waterproof membrane formula (by weight): 50 parts polyvinyl chloride resin, 20 parts acrylate copolymer, 3 parts polyethylene glycol, 1.5 parts antioxidant, 1 part ultraviolet absorber, 10 parts plasticizer, 6 parts modified nanocellulose agent (remove 5 parts modified nano silica).

[0062] The preparation process of the modified nanocellulose agent and the preparation process of the waterproof membrane are completely consistent with those of Example 1 of the waterproof layer.

[0063] Performance test results: hydrostatic pressure 70kPa, air permeability 1.9mm / s, flexural strength 35,000 cycles (-20℃~25℃), tensile strength 14MPa, and bonding strength with upper fabric 6.8N / 25mm.

[0064] Conclusion: Without the addition of modified nano-silica, the waterproof performance, bending resistance, tensile strength, and bonding strength of the waterproof membrane decreased significantly, with hydrostatic pressure decreasing by 20.5% and tensile strength decreasing by 26.3%. This indicates that modified nano-silica is indispensable for enhancing the structural strength of the waterproof membrane and improving its waterproof sealing performance.

[0065] Comparative Example 3 (without added modified nanocellulose agent, without added modified nano silica, otherwise consistent with Example 1 of waterproof layer) Waterproof membrane formula (by weight): 50 parts polyvinyl chloride resin, 20 parts acrylate copolymer, 3 parts polyethylene glycol, 1.5 parts antioxidant, 1 part ultraviolet absorber, 10 parts plasticizer (remove 5 parts modified nano silica and 6 parts modified nano cellulose agent).

[0066] The preparation process of the waterproof membrane is completely the same as that of Example 1 of the waterproof layer (without any steps related to modified materials).

[0067] Performance test results: hydrostatic pressure 55kPa, air permeability 1.2mm / s, flexural strength 22,000 cycles (-20℃~25℃), tensile strength 11MPa, and bonding strength with upper fabric 5.1N / 25mm.

[0068] Conclusion: Without the addition of the two modified materials, the performance of the waterproof membrane was reduced to the minimum, only reaching the basic level of the traditional C08L waterproof membrane. Compared with the waterproof layer in Example 1, the hydrostatic pressure decreased by 37.5%, the air permeability decreased by 42.9%, and the number of flexural cycles decreased by 56.4%, which fully demonstrates that the synergistic effect of the two modified materials is the core key to improving the performance of the waterproof membrane.

[0069] Comparative Example 4 (the process parameters for the modified nano-silica deviated from those of Example 1, but the rest were consistent with those of Example 1 for the waterproof layer). Deviations in the preparation process of modified nano-silica: ball milling speed 800 r / min (lower than the specified 1000-1500 r / min), ball milling time 1 h (shorter than the specified 2 h); the remaining process steps and formulation are completely consistent with Example 1 of the waterproof layer.

[0070] Performance test results: hydrostatic pressure 78kPa, air permeability 1.8mm / s, flexural strength 40,000 cycles (-20℃~25℃), tensile strength 16MPa, and bonding strength with upper fabric 7.8N / 25mm.

[0071] Conclusion: Insufficient ball milling speed and short time for modified nano-silica lead to inadequate modification and uneven dispersion, resulting in a decrease in the waterproof and reinforcing properties of the waterproof membrane. This indicates that the process parameters of modified nano-silica are crucial to its performance improvement and need to be strictly controlled.

[0072] Comparative Example 5 (process parameters of modified nanocellulose agent deviated, but the rest were consistent with Example 1 of waterproof layer) Deviations in the preparation process of modified nanocellulose agent: stirring temperature 50℃ (lower than the specified 55-60℃), stirring speed 400r / min (lower than the specified 450-500r / min); the remaining process steps and formulation are completely consistent with Example 1 of waterproof layer.

[0073] Performance test results: hydrostatic pressure 80kPa, air permeability 1.6mm / s, flexural strength 42,000 cycles (-20℃~25℃), tensile strength 17MPa, and bonding strength with upper fabric 8.0N / 25mm.

[0074] Conclusion: Insufficient stirring temperature and speed of the modified nanocellulose agent led to incomplete modification reaction, resulting in decreased compatibility with the substrate, reinforcement, and air permeability. This indicates that the process parameters of the modified nanocellulose agent must be strictly followed to achieve its optimal performance.

[0075] Comparative Example 6 (no silane-β-cyclodextrin additive was added in the modified nano-silica process; the rest was the same as in Example 1 of the waterproof layer) Deviations in the preparation process of modified nano-silica: The addition of silane-β-cyclodextrin additives is omitted, that is, in step S2, silane liquid, β-cyclodextrin agent and silane-β-cyclodextrin additives are not prepared, and in step S3, 3 parts illite powder and 1.5 parts kaolin are directly mixed with nano-silica mixture. The remaining process steps and formulations are completely consistent with Example 1 of waterproof layer.

[0076] The waterproof membrane formulation and preparation process are completely consistent with those in Example 1 of the waterproof layer.

[0077] Performance test results: hydrostatic pressure 76kPa, air permeability 1.7mm / s, flexural strength 39,000 cycles (-20℃~25℃), tensile strength 15.5MPa, and bonding strength with upper fabric 7.5N / 25mm.

[0078] Conclusion: Without the addition of silane-β-cyclodextrin additives, the surface activity of the modified nano-silica is insufficient, its compatibility with the substrate decreases, and its dispersion is uneven. This leads to a significant decrease in the waterproof sealing performance, flexural resistance, and tensile strength of the waterproof membrane, with hydrostatic pressure decreasing by 13.6% and flexural resistance decreasing by 29.1%. This indicates that silane-β-cyclodextrin additives are key components for improving the modification effect of nano-silica and optimizing the overall performance of the waterproof membrane.

[0079] Comparative Example 7 (no ball milling slurry was added during the preparation of the modified nanocellulose agent; the rest was the same as in Example 1 of the waterproof layer) Deviations in the preparation process of modified nanocellulose agent: The addition of ball milling fluid is omitted, that is, nano titanium dioxide agent and ball milling fluid are not prepared in step S12, and the nanocellulose liquid is directly stirred in step S13 (stirring parameters are the same as in Example 1). The remaining process steps and formulations are completely consistent with those in Example 1 of waterproof layer.

[0080] The waterproof membrane formulation and preparation process are completely consistent with those in Example 1 of the waterproof layer.

[0081] Performance test results: hydrostatic pressure 79kPa, air permeability 1.5mm / s, flexural strength 41,000 cycles (-20℃~25℃), tensile strength 16.2MPa, and bonding strength with upper fabric 7.9N / 25mm.

[0082] Conclusion: Without the addition of ball milling fluid, the modified nanocellulose agent exhibits insufficient fiber structure stability and a deteriorated hydrophilic-hydrophobic balance, failing to effectively construct breathable channels and a three-dimensional reinforcing network. This results in a decrease in the breathability and flexural resistance of the waterproof membrane, with a 28.6% decrease in air permeability and a 25.5% decrease in flexural resistance. This demonstrates that ball milling fluid is crucial for improving the performance of the modified nanocellulose agent.

[0083] Comparative Example 8 (The preparation conditions for the modified nanocellulose agent are different, but the rest are the same as in Example 1 of the waterproof layer) Deviations in the preparation process of modified nanocellulose agent: In step S13, the stirring temperature is 65℃ (higher than the specified 55-60℃) and the stirring time is 0.5h (shorter than the specified 1h). The remaining process steps and formulation are completely consistent with Example 1 of the waterproof layer.

[0084] The waterproof membrane formulation and preparation process are completely consistent with those in Example 1 of the waterproof layer.

[0085] Performance test results: hydrostatic pressure 81kPa, air permeability 1.6mm / s, flexural strength 43,000 cycles (-20℃~25℃), tensile strength 16.8MPa, and bonding strength with upper fabric 8.1N / 25mm.

[0086] Conclusion: Deviations in the preparation conditions of modified nanocellulose agents (too high temperature, too short time) led to insufficient modification reaction, resulting in decreased bonding strength with the substrate, reduced reinforcement, and decreased air permeability. This indicates that the preparation conditions of modified nanocellulose agents need to be strictly controlled to achieve their optimal performance. Deviations in preparation conditions will lead to a significant deterioration in the performance of the waterproof membrane.

[0087] The optimized polymer waterproof membrane exhibits excellent waterproof performance, breathability, and flexural strength. It is also flexible and not easily damaged, effectively solving the problems of imbalance between waterproofing and breathability, poor flexural strength, and easy damage of traditional waterproof membranes.

[0088] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0089] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for manufacturing a waterproof shoe with uppers, characterized in that, Includes the following steps: Step 1: Upper pretreatment: Select upper material and pretreat it by impregnation or coating with a waterproofing agent. After pretreatment, place the upper material in a ventilated and dry environment at 25-35℃ for 2-4 hours to dry. Step 2: Upper sewing process: Place the pre-treated upper material onto the shoe last, adjust it to fit tightly, and then use waterproof thread to sew the upper. Control the stitch length to be 0.8-1.2mm and the sewing tension to be 3-5N. After sewing, remove excess thread. Step 3: Applying the waterproof layer; Step 4: Upper-sole sealing treatment: Align the composite upper with the sole, apply water-based polyurethane adhesive along the joint to a thickness of 0.2-0.3 mm, apply pressure of 0.4-0.6 MPa, and then place in an environment of 25-35℃ for pressure curing for 3-5 hours; Step 5: Finishing process: Trim, clean, shape, inspect and package the shoe body to complete the production of the waterproof shoe.

2. The method for manufacturing a waterproof shoe with uppers according to claim 1, characterized in that, The specific process for waterproof layer lamination is as follows: Select a polymer waterproof membrane with a thickness of 0.3-0.8mm, and use a hot-pressing bonding process to bond the polymer waterproof membrane to the inner or outer side of the shoe upper. After bonding, place it in an environment of 30-40℃ for constant temperature curing for 1-2 hours.

3. The method for manufacturing a waterproof shoe with uppers according to claim 1, characterized in that, The formula of the polymer waterproof membrane by weight is as follows: 45-55 parts polyvinyl chloride resin, 15-25 parts acrylate copolymer, 3-8 parts modified nano silica, 2-5 parts polyethylene glycol, 1-2 parts antioxidant, 0.5-1.5 parts ultraviolet absorber, 8-12 parts plasticizer, and 5-8 parts modified nano cellulose agent.

4. The method for manufacturing a waterproof shoe with uppers according to claim 3, characterized in that, The antioxidant is antioxidant 1010; the ultraviolet absorber is ultraviolet absorber UV-327; the plasticizer is dioctyl phthalate; and the glass transition temperature of the acrylate copolymer is -20 to -10℃.

5. The method for manufacturing a waterproof shoe with uppers according to claim 3, characterized in that, The modification method for the modified nano-silica is as follows: S1: Preheat nano-silica at 60-65℃ for 1 hour to obtain preheated nano-silica. Mix 5-8 parts of preheated nano-silica, 2-5 parts of montmorillonite, 1-3 parts of zeolite powder and 5-8 parts of sodium citrate solution with a mass fraction of 8-10% thoroughly to obtain nano-silica mixture. S2: Mix 2-3 parts of silane coupling agent KH560, 5-8 parts of 85% ethanol aqueous solution and 1-2 parts of 5% chitosan solution evenly to obtain silane solution; Mix 2-5 parts of β-cyclodextrin, 1-3 parts of calcined talc powder and 5-8 parts of sodium silicate solution with a mass fraction of 5% to obtain β-cyclodextrin agent; stir silane solution and β-cyclodextrin agent at a weight ratio of 3:(5-7) to obtain silane-β-cyclodextrin additive. S3: 3-5 parts illite powder, 2-5 parts silane-β-cyclodextrin additive and 1-2 parts kaolin are mixed thoroughly to obtain functional additive; the nano silica mixture and functional additive are ball-milled at a weight ratio of (8-11):5 at a speed of 1000-1500 r / min for 2 h, then filtered and dried to obtain modified nano silica.

6. The method for manufacturing a waterproof shoe with uppers according to claim 5, characterized in that, The preparation method of the modified nanocellulose agent is as follows: S11: Mix 5-8 parts of nanocellulose, 3-5 parts of 5% sodium alginate solution and 1-3 parts of 2-5% sodium dodecylbenzenesulfonate solution evenly to obtain nanocellulose solution. S12: Mix 2-5 parts of nano titanium dioxide, 1-3 parts of maifan stone powder and 2-5 parts of lanthanum chloride solution evenly to obtain nano titanium dioxide agent; ball mill hydroxyapatite and nano titanium dioxide agent at a weight ratio of (7-11):5, ball milling speed 1000-1500 r / min for 2 h to obtain ball milling fluid; S13: The nanocellulose liquid and the ball milling liquid are stirred at a weight ratio of 2:(5-8), the stirring temperature is 55-60℃, the stirring speed is 450-500r / min, and the stirring time is 1h. After stirring, the mixture is filtered and dried to obtain the modified nanocellulose agent.

7. The method for manufacturing a waterproof shoe with uppers according to claim 1, characterized in that, The waterproofing agent mentioned in step 1 is a water-based polyurethane waterproofing agent, the immersion pretreatment time is 20-30 minutes, and the coating thickness of the coating pretreatment is 0.1 mm.

8. The method for manufacturing a waterproof shoe with uppers according to claim 1, characterized in that, The waterproof seam mentioned in step 2 is nylon waterproof seam, and there are no skipped stitches, loose stitches, or floating stitches during the sewing process.

9. A method for manufacturing a waterproof shoe with uppers according to claim 2, characterized in that, The parameters for the hot-press bonding process are: hot-press temperature 80-100℃, hot-press pressure 0.3-0.5MPa, and hot-press time 15-30s; The parameters for the shaping process in step 5 are as follows: place the shoe body on the shoe last and place it in a shaping box at 40-50℃ for 30-60 minutes.