A composite shoe inner and outer material

Abstract

This invention relates to the field of shoe upper material technology, specifically to a composite shoe inner upper material, comprising a TPU foam film. The TPU foam film is divided into a first foam layer and a second foam layer according to the foam pore size. The first foam layer is located on the outside of the TPU foam film, and the second foam layer is located in the middle of the TPU foam film. The first foam layer and the second foam layer are an integral structure. The first foam layer and the second foam layer have different pore sizes, and the TPU foam film filler is concentrated on the surface of the first foam layer. Through secondary foaming, a clearly layered first foam layer and a second foam layer are formed inside the TPU foam film. The first foam layer and the second foam layer are an integral structure, which is not prone to interface delamination. The different pore sizes of the two layers provide skin comfort and help improve the wearing comfort of the finished shoe.

Description

Technical Field

[0001] This invention relates to the field of shoe upper materials, and in particular to a composite shoe inner upper material. Background Technology

[0002] The upper material is the material used on the outside and inside of the finished shoe. The upper provides structural support for the foot, resists external impacts, and wraps the foot to ensure that the sole fits snugly against the foot. At the same time, the upper can be shaped into various lines and shapes according to needs. It not only determines the style of the shoe, but also directly affects the comfort, functionality, durability and safety of wearing.

[0003] Early shoe uppers were mainly made of PVC artificial leather, which is relatively hard and can be quickly molded into various clear lines and shapes on the surface through processes such as hot pressing. However, the wearing comfort of these shoes is not ideal. At present, the development of shoe upper materials is mainly focused on improving wearing comfort, that is, increasing the softness of the fabric to give it a "skin feel" like real skin. However, due to its soft texture, skin-feel fabrics are not easy to mold into various clear lines and shapes on their surface. The purpose of this invention is to propose a skin-feel fabric that is highly comfortable to wear and easy to mold into clear lines and shapes to solve the above-mentioned technical problems and promote the technological development in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a composite shoe inner and outer material to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: including a TPU foam film, where TPU refers to thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, which is a widely used shoe upper material in the field;

[0006] The TPU foam film is divided into a first foam layer and a second foam layer according to the foam pore size. The first foam layer is located on the outside of the TPU foam film and the second foam layer is located in the middle of the TPU foam film. The first foam layer and the second foam layer are an integral structure. The first foam layer and the second foam layer have different pore sizes and the TPU foam film filler is concentrated on the surface of the first foam layer.

[0007] As a further introduction to the technical solution: The TPU foam film is prepared using the following process:

[0008] a. TPU is injected into a pressure vessel and mixed with supercritical gas (CO2 in this implementation, with critical conditions of 31.26℃ and 72.9 atm) and a microcapsule foaming agent for supercritical foaming. The microcapsule foaming agent refers to microscopic capsule particles formed by encapsulating a foaming agent core within one or more dense polymer shells. The microcapsule foaming agent core is a polar liquid, and the shell contains charged nanoparticles coated with an organic conductive polymer. These nanoparticles can be polyaniline-coated carbon nanotubes, polypyrrole-coated titanium dioxide, PEDOT:PSS-coated glass microspheres, etc., and can be adjusted according to actual needs. The charging principle lies in the conjugated structure of the conductive polymer itself, which can be achieved through doping (such as proton acid doping). The nanoparticles (PANI) acquire permanent ionic charges. After being coated with a conductive polymer layer by oxidation doping (p-type doping), the particles exhibit an overall positive charge. After being coated with a conductive polymer layer by reduction doping (n-type doping), the particles exhibit an overall negative charge. In specific implementation, technicians can adjust the electrical properties of the nanoparticles coated with organic conductive polymers according to actual needs. The shell of the microcapsule foaming agent is made of plastic material with a melting point higher than the system temperature, which can prevent the nanoparticles from being released into the TPU foam film in advance. Technicians can select appropriate materials according to actual needs. The selection of different types of plastic materials will not affect the technical effect. As long as the aforementioned requirements are met, they are all applicable. During the process, the system temperature is controlled to be lower than the thermal activation temperature of the microcapsule foaming agent to avoid premature activation of the microcapsule foaming agent.

[0009] b. The TPU foam film is shaped into the required specifications by the die extrusion of the TPU foam film and a dense and stable foam core is formed to complete one foaming. The shape of the die can be adjusted according to the actual needs and the die exit size can be adjusted. This operation is a common supercritical foaming step in the field, so its processing conditions and operation points will not be explained further.

[0010] c. An external DC electric field is applied to attract the microcapsule foaming agent inside the TPU foam film to orient and move directionally to distribute on the outside of the TPU foam film. The direction of the electric field is perpendicular to the TPU delivery direction. In specific implementation, the orientation speed and movement speed of the microcapsule foaming agent can be adjusted by changing the electric field strength. The electric field strength is not the technical content that the applicant wants to protect, nor is it a necessary technical feature. Therefore, it will not be explained further.

[0011] d. Microwave heating of the microcapsule foaming agent for secondary foaming releases nanoparticles into the TPU foam film as fillers, which are concentrated on the surface of the first foam layer. After activation, the microcapsule foaming agent releases nanoparticles into the TPU foam film as fillers, and simultaneously moves directionally under the action of an electric field and concentrates on the surface of the first foam layer. In specific implementation, the foaming rate of the microcapsule foaming agent can be changed by changing the intensity of the microwave. The emission intensity of the microwave is not the technical content to be protected by the applicant, nor is it a necessary technical feature, so it will not be further explained.

[0012] e. Cooling and shaping of TPU foam film: This method quickly solidifies and shapes the bubbles to prevent them from collapsing or breaking. In practice, water cooling, air cooling, or contact with a cooling mold can be used to achieve cooling and shaping of the TPU foam film.

[0013] To optimize the above technical solution, the following measures are further taken: the first foaming layer is located on both sides of the TPU foam film. By making two different nanoparticles coated with organic conductive polymers carry different charges, the microcapsule foaming agent moves to both sides of the TPU foam film under the action of an electric field, thereby forming the first foaming layer on both sides of the TPU foam film.

[0014] As a further improvement to the above technical solution, it also includes an adhesive layer, which is disposed on the bottom surface of the TPU foam film and adhered to the foamed TPU. A release paper is disposed on the adhesive layer. The purpose of the adhesive layer is to facilitate the adhesion of the TPU foam film to other materials. The purpose of the release paper is to protect the adhesive layer. After peeling off the release paper, the adhesive layer can be adhered to the surface of other materials. The adhesive layer refers to a material layer formed by adhesive. Hot melt adhesive, adhesive, or other materials can be selected according to actual needs.

[0015] As a further improvement to the above technical solution, it also includes a waterproof membrane. The waterproof membrane is formed on the top surface of the TPU foam film. The waterproof membrane refers to the membrane-like component formed by spraying paint onto the surface of the TPU foam film to achieve a waterproof function in the existing technology. The specific material, thickness and color of the waterproof membrane are not the technical content that the applicant wants to protect, so they will not be further disclosed. In the specific implementation process, the technicians can select according to the actual needs, which will not have a substantial impact on the technical effect.

[0016] As a further improvement to the technical solution: the core of the microcapsule foaming agent is an oil, and carbon black is dispersed in the oil. In specific implementation, the oil can be a low-boiling-point oil such as liquid paraffin, dibutyl phthalate and methyl silicone oil. The carbon black is used to improve the efficiency of the oil being heated by microwaves, thereby quickly forming steam to achieve the foaming effect.

[0017] As an improvement to the aforementioned technical solution: heat preservation is carried out during the extrusion process of TPU foam film, and the heat preservation temperature is denoted as T, 130°C≤T≤150°C. The purpose is to balance the internal pressure of the pores with the external environment, ensure the normal shrinkage / growth of the pores, control and stabilize the size and shape, thereby obtaining the ideal density, and at the same time avoid the extrusion difficulties caused by the cooling and hardening of TPU foam film.

[0018] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:

[0019] A. Through secondary foaming, a first foam layer and a second foam layer with clear layers are formed in the TPU foam film. The first foam layer and the second foam layer are an integrated structure that is not prone to interface peeling. The two foam layers have different pore sizes, which can provide skin comfort and help improve the wearing comfort of the finished shoes.

[0020] B. The filler, first foam layer, and second foam layer form a unique "sandwich" structure. The filler is concentrated on the surface of the fabric, so it is easy to process and shape while ensuring comfort, and can create clear lines on its surface. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 This is a diagram showing the usage state of the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 3 This is a schematic diagram of a partial cross-sectional structure of the present invention (Example 1);

[0025] Figure 4 This is a schematic diagram of a partial cross-sectional structure of the present invention (Example 2);

[0026] In the diagram: TPU foam film-100, first foam layer-101, second foam layer-102, adhesive layer-200, release paper-201, waterproof membrane-300 Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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. Example 1

[0028] Please see Figure 1-4 The present invention provides a composite shoe inner and upper material, comprising a TPU foam film 100, an adhesive layer 200 and a waterproof membrane 300;

[0029] The TPU foam film 100 is divided into a first foam layer 101 and a second foam layer 102 according to the foam pore size. The first foam layer 101 and the second foam layer 102 are an integral structure. The first foam layer 101 is located on both sides of the TPU foam film 100 and the second foam layer 102 is located in the middle of the TPU foam film 100. The pore sizes of the first foam layer 101 and the second foam layer 102 are different, and the filler of the TPU foam film 100 is concentrated on the surface of the first foam layer 101.

[0030] TPU foam film 100 is prepared using the following process:

[0031] a. TPU is injected into a pressure vessel and mixed with supercritical CO2 gas and microcapsule foaming agent. The core of the microcapsule foaming agent is a polar liquid and the shell of the microcapsule foaming agent contains charged nanoparticles coated with organic conductive polymer. The system temperature is lower than the thermal activation temperature of the microcapsule foaming agent. The core of the microcapsule foaming agent is grease, and carbon black is dispersed in the grease.

[0032] b. TPU foam film 100 is extruded through a die to form a dense and stable foam core, completing the first foaming and forming the second foam layer 102. The TPU foam film 100 is kept warm during the extrusion process, and the heat preservation temperature is denoted as T, 130°C≤T≤150°C.

[0033] c. An external DC electric field is applied to attract the microcapsule foaming agent inside the TPU foam film 100 to orient and move directionally to distribute on the outside of the TPU foam film 100, with the direction of the electric field perpendicular to the TPU delivery direction;

[0034] d. Microwave heating of microcapsule foaming agent to form first foam layer 101 through secondary foaming, nanoparticles are released into TPU foam film 100 as fillers and concentrated on the surface of first foam layer 101;

[0035] e.TPU foam film 100 cooling and shaping.

[0036] The adhesive layer 200 is disposed on the bottom surface of the TPU foam film 100 and adheres to the foamed TPU. Release paper 201 is disposed on the adhesive layer 200.

[0037] The waterproof membrane 300 is formed on the top surface of the TPU foam film 100 by spraying. Example 2

[0038] Please see Figure 1-4The present invention provides a composite shoe inner and upper material, comprising a TPU foam film 100, an adhesive layer 200 and a waterproof membrane 300;

[0039] The TPU foam film 100 is divided into a first foam layer 101 and a second foam layer 102 according to the foam pore size. The first foam layer 101 and the second foam layer 102 are an integral structure. The first foam layer 101 is located on the outside of the TPU foam film 100 and the second foam layer 102 is located in the middle of the TPU foam film 100. The pore sizes of the first foam layer 101 and the second foam layer 102 are different, and the filler of the TPU foam film 100 is concentrated on the surface of the first foam layer 101.

[0040] TPU foam film 100 is prepared using the following process:

[0041] a. TPU is injected into a pressure vessel and mixed with supercritical CO2 gas and microcapsule foaming agent. The core of the microcapsule foaming agent is a polar liquid and the shell of the microcapsule foaming agent contains charged nanoparticles coated with organic conductive polymers. The two types of nanoparticles coated with organic conductive polymers are positively charged and negatively charged, respectively. The system temperature is lower than the thermal activation temperature of the microcapsule foaming agent. The core of the microcapsule foaming agent is actually an oil, and carbon black is dispersed in the oil.

[0042] b. TPU foam film 100 is extruded through a die to form a dense and stable foam core, completing the first foaming and forming the second foam layer 102. The TPU foam film 100 is kept warm during the extrusion process, and the heat preservation temperature is denoted as T, 130°C≤T≤150°C.

[0043] c. An external DC electric field is applied to attract the microcapsule foaming agent inside the TPU foam film 100 to orient and move directionally to distribute on the outside of the TPU foam film 100, with the direction of the electric field perpendicular to the TPU delivery direction;

[0044] d. Microwave heating of microcapsule foaming agent to form first foam layer 101 through secondary foaming, nanoparticles are released into TPU foam film 100 as fillers and concentrated on the surface of first foam layer 101;

[0045] e.TPU foam film 100 cooling and shaping.

[0046] The adhesive layer 200 is disposed on the bottom surface of the TPU foam film 100 and adheres to the foamed TPU. Release paper 201 is disposed on the adhesive layer 200.

[0047] The waterproof membrane 300 is formed on the top surface of the TPU foam film 100 by spraying.

[0048] Working principle: Supercritical foaming forms a second foaming layer 102 with dense micropores at the center of the TPU foam film 100. Under the action of an external electric field, the microcapsule foaming agent moves in a direction to form a first foaming layer 101 on the outside of the TPU foam film 100. The first foaming layer 101 and the second foaming layer 102 work together to give the TPU foam film 100 a comfortable feel and improve wearing comfort. Moreover, the first foaming layer 101 and the second foaming layer 102 are an integral structure without the use of adhesives, so there will be no interface peeling.

[0049] Because the microcapsule foaming agent moves directionally to the outside of the TPU foam film 100 under the action of an external electric field, the nanoparticles inside the microcapsule foaming agent can be released as fillers after activation and concentrate on the outside of the TPU foam film 100, forming a "sandwich" structure of the TPU foam film 100 consisting of a filler layer, a first foam layer 101, and a second foam layer 102. Since the filler is concentrated on the outside of the TPU foam film 100, a clear surface can be formed when the surface of this shoe upper material is hot-pressed (see Appendix). Figure 1 It is both comfortable to the touch and easy to process, allowing technicians to process its surface to create different lines and shapes. In addition, perforations can be made on the surface of the shoe upper material to improve its breathability and moisture permeability.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite shoe inner upper material, characterized in that, include: TPU foam film (100); The TPU foam film (100) is divided into a first foam layer (101) and a second foam layer (102) according to the foam pore size. The first foam layer (101) and the second foam layer (102) are an integral structure. The first foam layer (101) is located on the outside of the TPU foam film (100) and the second foam layer (102) is located in the middle of the TPU foam film (100). The pore sizes of the first foam layer (101) and the second foam layer (102) are different and the filler of the TPU foam film (100) is concentrated on the surface of the first foam layer (101). The TPU foam film (100) is prepared using the following process: a. TPU is injected into a pressure vessel and mixed with supercritical gas and microcapsule foaming agent. The core of the microcapsule foaming agent is a polar liquid and the shell of the microcapsule foaming agent contains charged nanoparticles coated with organic conductive polymer. The system temperature is lower than the thermal activation temperature of the microcapsule foaming agent. b. TPU foam film (100) is extruded through a die to form a dense and stable foam core, completing one foaming step; c. An external DC electric field is applied to attract the microcapsule foaming agent inside the TPU foam film (100) to orient and move directionally to distribute on the outside of the TPU foam film (100), with the electric field direction perpendicular to the TPU delivery direction; d. Microwave heating of microcapsule foaming agent for secondary foaming, nanoparticles are released into TPU foam film (100) as filler and concentrated on the surface of the first foam layer (101); e.TPU foam film (100) is cooled and shaped.

2. The composite shoe inner and outer material according to claim 1, characterized in that: The first foam layer (101) is located on both sides of the TPU foam film (100).

3. A composite shoe inner upper material according to any one of claims 1 or 2, characterized in that: It also includes an adhesive layer (200), which is disposed on the bottom surface of the TPU foam film (100) and bonded to the foamed TPU. Release paper (201) is disposed on the adhesive layer (200).

4. A composite shoe inner and outer material according to any one of claims 1 or 2, characterized in that: It also includes a waterproof membrane (300) formed on the top surface of the TPU foam membrane (100).

5. The composite shoe inner upper material according to claim 1, characterized in that: The core of the microcapsule foaming agent is an oil, and carbon black is dispersed within the oil.

6. A composite shoe inner upper material according to any one of claims 1 or 2, characterized in that: During the extrusion process of TPU foam film (100), the insulation temperature is denoted as T, where 130°C ≤ T ≤ 150°C.

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