Two-component breathable film and composite fabric

Abstract

The utility model discloses a two-component breathable film and a composite fabric, and relates to the technical field of composite films. The key points of the technical scheme are as follows: the air-permeable protective film comprises a PTFE film, one side of the PTFE film is fixedly connected with an air-permeable protective film, the air-permeable protective film is provided with a plurality of air-permeable micropores, one side of the air-permeable protective film is fixedly connected with adhesive points connected with the PTFE film, the adhesive points are irregularly arranged on the air-permeable protective film, and the air-permeable protective film is provided with a plurality of air-permeable micropores. The PTFE film and the breathable protective film are supported by the adhesive points to form a breathable cavity, the breathable cavity is communicated with the breathable micropores, the PTFE film and the breathable protective film are arranged, the durability of the PTFE film is improved while the water pressure resisting effect of the PTFE film is achieved, and the application range of the breathable film is wider.

Description

Technical Field

[0001] This utility model relates to the field of composite membrane technology, and more specifically, to a two-component breathable membrane and composite fabric. Background Technology

[0002] There are many common films used in textiles, including hot melt adhesive films, pressure-sensitive adhesive films, heat transfer films, water transfer films, and other films. These films enhance the fabric's properties and improve its washability, abrasion resistance, and other performance characteristics.

[0003] PTFE membranes are commonly used in existing technologies. PTFE membranes have good air permeability, high strength, good chemical resistance, and water pressure resistance. Among them, the water pressure resistance is more outstanding than that of similar membranes. However, PTFE membranes also have some shortcomings in practical use, such as poor resilience, difficulty in pressing, poor scratch resistance, and poor washability. Therefore, it is necessary to design a structure to make up for the shortcomings of PTFE membranes in use.

[0004] Therefore, a new solution is needed to address this problem. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a two-component breathable membrane and composite fabric.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a two-component breathable membrane and composite fabric, including a PTFE membrane, a breathable protective membrane fixedly connected to one side of the PTFE membrane, a plurality of breathable micropores provided on the breathable protective membrane, a plurality of adhesive dots fixedly connected to one side of the breathable protective membrane to form a breathable cavity, the adhesive dots being irregularly arranged on the breathable protective membrane, and the breathable cavity communicating with the breathable micropores.

[0007] The present invention is further configured such that the adhesive dots are polyurethane resin diluted with DMF.

[0008] The present invention is further configured such that the breathable protective film is any one or more of TPU thin film, PU porous film, and water-based PU microporous film.

[0009] The present invention is further configured such that the diameter of the breathable micropore is smaller than that of a water droplet molecule but larger than that of a gas molecule, and the size of the breathable micropore is set between 0.01 and 0.3 nanometers.

[0010] The present invention is further configured such that the resilience of the breathable protective film is superior to that of the PTFE film.

[0011] A composite fabric includes an inner layer and an outer layer, wherein a two-component breathable membrane as described above is fixedly connected between the inner layer and the outer layer, the PTFE membrane is fixedly connected to the outer layer, and the breathable protective membrane is fixedly connected to the inner layer.

[0012] The present invention is further configured such that: the inner layer is woven from a number of warp groups and a number of weft groups in a plain weave pattern, the distance between adjacent weft groups is greater than the distance between adjacent warp groups, the two adjacent warp groups located between adjacent weft groups are a group and are fixed by winding polyester yarn, and the polyester yarn pulls the adjacent warp groups to form two C-shapes arranged in opposite directions.

[0013] In summary, this utility model has the following beneficial effects:

[0014] After the DMF diluted polyurethane resin dissolves, gaps are formed between the adhesive dots to allow air to flow. The adhesive dots support the PTFE membrane and the breathable protective membrane to form a breathable cavity. The breathable cavity is connected to the breathable micropores. The breathable cavity provides a transit space for the exchange of air between the breathable protective membrane and the PTFE membrane, ensuring that air can be continuously exchanged on both sides of the breathable membrane. At the same time, the breathable protective membrane can also protect the PTFE membrane, reduce scratches during use, and extend the service life of the PTFE membrane. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the two-component breathable membrane in this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the two-component breathable membrane combined with the inner and outer layers in this utility model;

[0017] Figure 3 This is the weaving pattern of the inner layer in this utility model.

[0018] In the diagram: 1. PTFE membrane; 2. Breathable protective membrane; 3. Adhesive dots; 4. Breathable micropores; 5. Inner layer; 6. Outer layer. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] A two-component breathable membrane, such as Figure 1As shown, the device includes a PTFE membrane 1, which has good water pressure resistance and air permeability. A breathable protective membrane 2 is fixedly connected to one side of the PTFE membrane 1. The breathable protective membrane 2 has several breathable micropores 4. The breathable protective membrane 2 can protect the PTFE membrane 1 and improve its scratch resistance. At the same time, the breathable micropores 4 on the breathable protective membrane 2 reduce the impact of the breathable protective membrane 2 on the air permeability of the PTFE membrane 1. The air on both sides of the breathable protective membrane 2 and the PTFE membrane 1 can still be exchanged through the breathable micropores 4, so as to realize air circulation and improve the air permeability of the breathable membrane.

[0021] like Figure 1 As shown, one side of the breathable protective membrane 2 is fixedly connected with adhesive dots 3 for connecting the PTFE membrane 1. The adhesive dots 3 are irregularly arranged on the breathable protective membrane 2. The adhesive dots 3 are made of DMF-diluted polyurethane resin. The DMF-diluted polyurethane resin is scraped onto the PTFE membrane 1. Based on the characteristic that DMF-diluted polyurethane resin is soluble in water, the PTFE membrane 1 after scraping is immersed in an aqueous solution. The aqueous solution dissolves part of the DMF-diluted polyurethane resin, thereby forming several irregular adhesive dots 3 on the PTFE membrane 1. The immersion time should be controlled during the immersion in the aqueous solution. In the process of dissolving the DMF-diluted polyurethane resin, the adhesive dots 3 are kept from being completely dissolved, ensuring their stable formation on the PTFE membrane 1. This provides adhesion for the subsequent lamination of the breathable protective membrane 2. The adhesive dots 3 formed after the DMF-diluted polyurethane resin is dissolved create gaps between them to allow air to flow. The adhesive dots 3 support the PTFE membrane 1 and the breathable protective membrane 2 to form a breathable cavity. The breathable cavity is connected to the breathable micropores 4. The breathable cavity provides a transit space for the exchange of air between the breathable protective membrane 2 and the PTFE membrane 1, ensuring that air can be continuously exchanged on both sides of the breathable membrane.

[0022] like Figure 1 As shown, the breathable protective film 2 is set as any one or more of TPU thin film, PU porous film, and water-based PU microporous film. The breathable protective film 2 is a film with micropores. The TPU thin film, PU porous film, and water-based PU microporous film are all provided with a number of micropores. The microporous structure on the film ensures the breathability of the two-component breathable film. The diameter of the breathable micropores 4 is smaller than that of water droplets and larger than that of gas molecules. The size of the breathable micropores 4 is set between 0.01-0.3 nanometers. The resilience of the breathable protective film 2 is better than that of the PTFE film 1. Moreover, the scratch resistance of the TPU thin film, PU porous film, and water-based PU microporous film is better than that of the PTFE film 1, thus protecting the PTFE film 1 and extending its service life.

[0023] A composite fabric, such as Figure 1 and Figure 2As shown, the composite fabric includes an inner layer 5 and an outer layer 6. A two-component breathable membrane is fixedly connected between the inner layer 5 and the outer layer 6. The two-component breathable membrane is positioned between the inner layer 5 and the outer layer 6, which makes the two sides of the composite fabric show the fabric texture. The breathable membrane can still achieve the effect of resisting water pressure. A PTFE membrane 1 is fixedly connected to the outer layer 6, and a breathable protective membrane 2 is fixedly connected to the inner layer 5. The PTFE membrane 1 is positioned on the side closer to the outer layer 6. The PTFE membrane 1 can better resist external water pressure, while the breathable protective membrane 2 is positioned on the side closer to the inner layer 5. Air passes through the breathable micropores 4 of the breathable protective membrane 2 and comes into contact with the body surface, improving the comfort of using the fabric.

[0024] like Figures 2-3 As shown, the inner layer 5 is woven from several warp and weft groups using a plain weave pattern. The distance between adjacent weft groups is greater than the distance between adjacent warp groups. Two adjacent warp groups located between adjacent weft groups are grouped together and fixed by winding polyester yarn. The polyester yarn pulls the adjacent warp groups to form two C-shapes facing away from each other. The warp of the inner layer 5 is made of spandex-covered yarn, and the outer covering yarn of the spandex-covered yarn is made of cotton yarn. Spandex yarn has good elasticity and elastic recovery, and it is easy to deform after being stretched. This makes it easier to stretch adjacent warp groups and avoids the polyester yarn from damaging the warp. Excessive tension in the warp yarns caused breakage. The weft yarns of the inner layer 5 are made of polyester yarn. After the warp yarns are stretched and deformed, the spacing between adjacent warp yarn groups increases, allowing more air to circulate along this space, ensuring the breathability of the composite fabric. During weaving, the warp yarns are threaded onto the water jet diameter and the spacing between adjacent warp yarn groups is increased. The spacing between adjacent weft yarn groups is also widened during weft insertion. After the inner layer 5 is woven, the polyester yarns are sewn onto the adjacent warp yarn groups using a sewing machine. After tightening the polyester yarns, the warp yarn groups deform into an arc shape, completing the processing of the inner layer 5.

[0025] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A two-component breathable membrane, characterized in that: The PTFE membrane (1) is fixedly connected to one side of the PTFE membrane (1). The breathable protective membrane (2) is provided with a plurality of breathable micropores (4). A plurality of adhesive dots (3) are fixedly connected to one side of the breathable protective membrane (2) to form a breathable cavity. The adhesive dots (3) are irregularly arranged on the breathable protective membrane (2). The breathable cavity is connected to the breathable micropores (4).

2. The two-component breathable membrane according to claim 1, characterized in that: The adhesive dots (3) are set as polyurethane resin diluted with DMF.

3. The two-component breathable membrane according to claim 2, characterized in that: The breathable protective film (2) is set as any one or more of TPU thin film, PU porous film, and water-based PU microporous film.

4. The two-component breathable membrane according to claim 1, characterized in that: The diameter of the breathable micropore (4) is smaller than that of a water droplet molecule and larger than that of a gas molecule, and the size of the breathable micropore (4) is set between 0.01 and 0.3 nanometers.

5. The two-component breathable membrane according to claim 1, characterized in that: The resilience of the breathable protective membrane (2) is better than that of the PTFE membrane (1).

6. A composite fabric, characterized in that: It includes an inner layer (5) and an outer layer (6), wherein a two-component breathable membrane as described in any one of claims 1-5 is fixedly connected between the inner layer (5) and the outer layer (6), wherein the PTFE membrane (1) is fixedly connected to the outer layer (6), and the breathable protective membrane (2) is fixedly connected to the inner layer (5).

7. A composite fabric according to claim 6, characterized in that: The inner layer (5) is woven from several warp groups and several weft groups in a plain weave pattern. The distance between adjacent weft groups is greater than the distance between adjacent warp groups. The two adjacent warp groups located between adjacent weft groups are a group that is wound and fixed by polyester yarn. The polyester yarn pulls the adjacent warp groups to form two C-shaped structures that are set in opposite directions.

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