Film composite fabric with high waterproof, high moisture permeability and flame retardant functions

Abstract

The utility model discloses a film composite fabric with high waterproof, high moisture permeability and flame retardant functions, the film composite fabric with high waterproof, high moisture permeability and flame retardant functions comprises a surface fabric, a flame retardant adhesive layer, a PTFE porous film layer, a hydrophilic polyurethane layer and an inner fabric in sequence, the surface fabric and the PTFE porous film layer are bonded by the flame retardant adhesive layer, and the PTFE porous film layer and the inner fabric are hot-pressed by the hydrophilic polyurethane layer. The utility model has flame retardant, waterproof and breathable functions, and its flame retardant performance is well maintained after multiple washings.

Description

Technical Field

[0001] The utility model relates to a film composite fabric, in particular to a film composite fabric with high waterproof, high moisture permeability and flame retardant functions. Background Art

[0002] Fabrics bonded with microporous films are essential clothing fabrics for special operations. They are waterproof and breathable and are widely used in safety clothing in many industries, including various types of space suits, fire suits, police riot suits, petrochemical fire protection suits, and electrician clothing. Combining highly breathable and breathable PTFE microporous films with flame-retardant fabrics can better achieve flame-retardant protection, and the market prospects are broad. However, traditional flame-retardant fabrics mainly achieve flame-retardant effects after being treated with flame retardants. After the PTFE microporous film is bonded to it, the flame-retardant effect is greatly reduced after multiple washings. There are problems such as short practical life, low temperature resistance, and poor comfort, and it cannot effectively protect the lives of workers for a long time. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the task of the utility model is to provide a film composite fabric with high waterproof, high moisture permeability and flame retardant functions, so as to improve the water resistance of the flame retardant and breathable fabric.

[0004] The technical scheme of the utility model is as follows: a film composite fabric with high waterproof, high moisture permeability and flame retardant functions, which comprises a surface fabric, a flame retardant adhesive layer, a PTFE porous film layer, a hydrophilic polyurethane layer and an inner fabric in sequence, wherein the surface fabric and the PTFE porous film layer are bonded together by the flame retardant adhesive layer, and the PTFE porous film layer and the inner fabric are hot-pressed together by the hydrophilic polyurethane layer.

[0005] Furthermore, the thickness of the PTFE porous film layer is 20-70 μm, and the surface density is 24-26 g / m 2 .

[0006] Furthermore, the porosity of the PTFE porous film layer is 25% to 96%, and the pore size is 0.01 to 1.3 μm.

[0007] Furthermore, the surface fabric is 30D-100D nylon or polyester.

[0008] Furthermore, the inner layer fabric is 20D-30D nylon yarn or polyester yarn.

[0009] The advantages of the utility model compared with the prior art are:

[0010] The utility model adopts a flame retardant adhesive layer to bond one side of the PTFE porous film layer to the fabric, and hot presses the hydrophilic polyurethane layer on the other side. The PTFE and PU form a two-component composite membrane, which enhances the flame retardant effect of the fabric. At the same time, the membrane formed by the hydrophilic polyurethane layer can prevent the squeezing of the fabric surface by water washing, and minimize the influence of water washing on the post-processing of the material, thereby ensuring that the flame retardant performance is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the structure of each layer of a film composite fabric with high waterproof, high moisture permeability and flame retardant functions according to an embodiment. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the embodiments, but is not intended to limit the present invention.

[0013] Please combine Figure 1 As shown, the present embodiment involves a film composite fabric with high waterproof, high moisture permeability and flame retardant functions, which has a five-layer structure, namely, a surface fabric, a flame retardant adhesive layer, a PTFE porous film layer, a hydrophilic polyurethane layer and an inner fabric, wherein the surface fabric can be 30D~100D nylon or polyester, and the present embodiment is nylon\70D, and the inner fabric can be 20D~30D nylon floating yarn or polyester floating yarn, and the present embodiment is nylon floating yarn / 20D.

[0014] The PTFE porous film layer is prepared by a biaxial stretching pore forming method. During preparation, the warp tensile strength is about 30 MPa and the stretching multiple is 10 times. The weft tensile strength is half of the warp, about 15 MPa, and the stretching multiple is 5 times. The stretching temperature is from room temperature to the melting point of PTFE, and the setting temperature is 320-340°C. The PTFE porous film layer obtained by stretching has a thickness of 20-70 μm. The thickness during implementation can be 20 μm, 30 μm, 50 μm, 70 μm, etc., which can be selected according to the purpose of the fabric. An overly thick PTFE porous film layer will affect the comfort of the fabric. The thickness uniformity of the PTFE porous film layer is less than 5%, and the surface density is 24-26 g / m 2 The porosity of the PTFE porous film layer is 25% to 96%, such as 25%, 30%, 50%, 60%, 70%, 90%, etc., and the pore size is 0.01 to 1.3 μm, such as 0.01 μm, 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, 0.8 μm, etc.

[0015] The hydrophilic polyurethane layer is first prepared on the surface of the PTFE porous film layer. The polyurethane resin is first dissolved with a solvent to make the solid content between 20% and 30%, and then coated on a release paper, covered with a PTFE porous film layer, baked at 70°C for 2 minutes, and baked at 150°C for 3 minutes. After cooling for several minutes, the release paper is removed to obtain a composite film layer of PTFE and hydrophilic polyurethane.

[0016] The side of the PTFE porous film layer without the hydrophilic polyurethane layer is bonded to the surface fabric through a flame retardant adhesive layer. The flame retardant adhesive layer can be made of adhesive glue with added bromotriazine. The side of the PTFE porous film layer with the hydrophilic polyurethane layer is pressed to the inner fabric through hot pressing at 130-150°C.

[0017] The flame retardant performance of a specific embodiment and a comparative example is tested below. The embodiment is a surface layer of nylon / 70D, a PTFE porous film layer with a thickness of 30μm, and an inner layer of nylon yarn / 20D. The comparative example is a surface layer of nylon / 70D bonded with a 30μm thick PTFE porous film layer by ordinary glue, and the British standard BS5852:2006 is used for three tests. The results are as follows:

[0018]

[0019] It can be seen that the flame extinguishing time of the common PTFE porous film composite fabric is about 8 times that of the present invention, and the flame retardant performance of the present invention will not change much after multiple washings.

Claims

1. A film composite fabric with high waterproof, high moisture permeability and flame retardant functions, characterized in that: The film composite fabric with high waterproof, high moisture permeability and flame retardant functions comprises a surface fabric, a flame retardant adhesive layer, a PTFE porous film layer, a hydrophilic polyurethane layer and an inner fabric in sequence. The surface fabric and the PTFE porous film layer are bonded together by the flame retardant adhesive layer, and the PTFE porous film layer and the inner fabric are hot-pressed together by the hydrophilic polyurethane layer.

2. The film composite fabric with high waterproof, high moisture permeability and flame retardant functions according to claim 1, characterized in that: The thickness of the PTFE porous film layer is 20-70 μm, and the surface density is 24-26 g / m 2 .

3. The film composite fabric with high waterproof, high moisture permeability and flame retardant functions according to claim 1, characterized in that: The porosity of the PTFE porous film layer is 25% to 96%, and the pore size is 0.01 to 1.3 μm.

4. The film composite fabric with high waterproof, high moisture permeability and flame retardant functions according to any one of claims 1 to 3, characterized in that: The surface fabric is 30D-100D nylon or polyester.

5. The film composite fabric with high waterproof, high moisture permeability and flame retardant functions according to any one of claims 1 to 3, characterized in that: The inner layer fabric is 20D-30D nylon yarn or polyester yarn.

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