PTFE (Polytetrafluoroethylene) fiber woven layer with anti-separation structure

Abstract

The utility model relates to the technical field of PTFE (Polytetrafluoroethylene) fiber braid layers, and discloses a PTFE fiber braid layer with an anti-separation structure, which comprises a PTFE hollow fiber membrane, the PTFE hollow fiber membrane is formed by combining a glass fiber braid layer, a PTEF (Polytetrafluoroethylene) superfine fiber membrane and a polyvinyl alcohol superfine fiber membrane, the upper surface of the glass fiber braid layer is covered with the PTEF superfine fiber membrane, and the lower surface of the PTFE hollow fiber membrane is covered with the polyvinyl alcohol superfine fiber membrane. The upper surface of the PTEF superfine fiber membrane is covered with the polyvinyl alcohol superfine fiber membrane, the upper surface of the PTFE hollow fiber membrane is covered with the first PTFE flat membrane, the lower surface of the PTFE hollow fiber membrane is covered with the second PTFE flat membrane, and the polyvinyl alcohol superfine fiber membrane serves as an outer layer, so that additional chemical protection is provided, interlayer separation caused by possible chemical reaction is prevented, and the service life of the membrane is prolonged. The elastic response of the multi-layer structure is more integral when the multi-layer structure is stressed, interlayer separation caused by overlarge local stress is reduced, and the separation prevention performance of the PTFE fiber woven layer is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of PTFE fiber braided layers, and specifically, to a PTFE fiber braided layer with an anti-separation structure. Background Art

[0002] The PTFE fiber braided layer, whose main component is polytetrafluoroethylene, is also known as fluoron or terlon. The PTFE fiber has relatively high strength and elongation, which enables the braided layer to have good tensile strength and toughness when bearing external forces. The main production methods of PTFE fiber include emulsion spinning, paste extrusion spinning, melt spinning, etc. These methods can prepare PTFE fibers with different specifications and properties, and then braid them into various braided layers.

[0003] There are some drawbacks in the existing devices during use. For example, the PTFE (polytetrafluoroethylene) fiber braided layer consists of multiple layers. While this multi-layer structure provides certain strength and functionality, it also faces the risk of interlayer separation. Due to the insufficient tight connection between the PTFE (polytetrafluoroethylene) layers, interlayer separation occurs, which weakens the overall structural strength of the braided layer and makes it more likely to be damaged when stressed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a PTFE fiber braided layer with an anti-separation structure, and solve the problem that the connection between the PTFE (polytetrafluoroethylene) layers is not tight enough, resulting in interlayer separation, which weakens the overall structural strength of the braided layer and makes it more likely to be damaged when stressed.

[0005] The utility model provides the following technical solution: A PTFE fiber braided layer with an anti-separation structure, including a PTFE hollow fiber membrane. The PTFE hollow fiber membrane is composed of a glass fiber braided layer, a PTEF ultra-fine fiber membrane, and a polyvinyl alcohol ultra-fine fiber membrane. The upper surface of the glass fiber braided layer is covered with a PTEF ultra-fine fiber membrane. The upper surface of the PTEF ultra-fine fiber membrane is covered with a polyvinyl alcohol ultra-fine fiber membrane. The upper surface of the PTFE hollow fiber membrane is covered with a first PTFE flat membrane, and the lower surface of the PTFE hollow fiber membrane is covered with a second PTFE flat membrane.

[0006] As a preference of the above technical solution, a plurality of pores are woven on the glass fiber braided layer.

[0007] As a preference of the above technical solution, the PTFE hollow fiber membrane is formed by unidirectional stretching, and the first PTFE flat membrane and the second PTFE flat membrane are formed by bidirectional stretching.

[0008] As a preference of the above technical solution, the outer surface of the glass fiber woven layer is sprayed with a low melting range fluoropolymer.

[0009] As a preference of the above technical solution, the glass fiber woven layer, the PTEF ultrafine fiber membrane and the polyvinyl alcohol ultrafine fiber membrane are fixed in a non-glued bonding manner.

[0010] As a preference of the above technical solution, the PTFE hollow fiber membrane, the first PTFE flat membrane and the second PTFE flat membrane are fixed in a non-glued bonding manner.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] In the present utility model, the glass fiber woven layer serves as a support matrix, providing excellent mechanical strength and stability, ensuring durability in various harsh environments. The ultrafine fiber PTFE forms the main filtration layer, having good chemical stability and corrosion resistance. The polyvinyl alcohol ultrafine fiber membrane is mainly used to enhance the tensile and tear resistance of the membrane, and as the outer layer, it provides additional chemical protection, preventing interlayer separation caused by possible chemical reactions. This multi-layer structure has a more integral elastic response when stressed, reducing interlayer separation caused by excessive local stress and significantly improving the anti-separation performance of the PTFE fiber woven layer. Description of the Drawings

[0013] Figure 1 It is a three-dimensional structural schematic diagram of a PTFE fiber woven layer with an anti-separation structure;

[0014] Figure 2 It is a cross-sectional structural schematic diagram of the glass fiber woven layer;

[0015] Figure 3 It is a three-dimensional structural schematic diagram of the glass fiber woven layer.

[0016] In the figure: 10, PTFE hollow fiber membrane; 101, glass fiber woven layer; 1011, pores; 1012, low melting range fluoropolymer; 102, PTEF ultrafine fiber membrane; 103, polyvinyl alcohol ultrafine fiber membrane; 11, first PTFE flat membrane; 12, second PTFE flat membrane. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0018] Embodiment 1

[0019] As Figure 1As shown in the figure, the present utility model provides a technical solution: a PTFE fiber woven layer with an anti-separation structure, including a PTFE hollow fiber membrane 10, which is composed of a glass fiber woven layer 101, a PTEF ultra-fine fiber membrane 102, and a polyvinyl alcohol ultra-fine fiber membrane 103. The upper surface of the glass fiber woven layer 101 is covered with a PTEF ultra-fine fiber membrane 102, and the upper surface of the PTEF ultra-fine fiber membrane 102 is covered with a polyvinyl alcohol ultra-fine fiber membrane 103. The upper surface of the PTFE hollow fiber membrane 10 is covered with a first PTFE flat membrane 11, and the lower surface of the PTFE hollow fiber membrane 10 is covered with a second PTFE flat membrane 12. The glass fiber woven layer serves as a support matrix, providing excellent mechanical strength and stability, ensuring durability in various harsh environments. The ultra-fine fiber PTFE forms the main filtration layer, having good chemical stability and corrosion resistance. The polyvinyl alcohol ultra-fine fiber membrane is mainly used to enhance the tensile and tear resistance of the membrane, and as the outer layer, it provides additional chemical protection, preventing interlayer separation caused by possible chemical reactions. This multi-layer structure has a more integral elastic response when stressed, reducing interlayer separation caused by excessive local stress and significantly improving the anti-separation performance of the PTFE fiber woven layer.

[0020] As an implementation manner in this embodiment, as Figure 3 shown, a plurality of pores 1011 are woven on the glass fiber woven layer 101. The pore structure can absorb and disperse external force impacts, enhancing the impact resistance of the material. When subjected to impacts, the deformation of the pores can reduce damage to the internal structure and extend the service life of the material.

[0021] Among them, the PTFE hollow fiber membrane 10 is formed by unidirectional stretching, which helps to control the pore size and improve the mechanical strength of the membrane. The first PTFE flat membrane 11 and the second PTFE flat membrane 12 are formed by biaxial stretching. During the biaxial stretching process, the first PTFE flat membrane 11 and the second PTFE flat membrane 12 are first calendered and extruded to form a film, and then stretched in two perpendicular directions. In this way, the microporous structure of the first PTFE flat membrane 11 and the second PTFE flat membrane 12 is optimized, making them have a higher porosity and a more uniform pore size distribution. These microporous structures endow the PTFE membrane with functions such as filtration, waterproof and moisture permeability.

[0022] As an implementation manner in this embodiment, as Figure 2As shown, a low-melting-range fluoropolymer 1012 is sprayed on the outer surface of the fiberglass braided layer 101. The low-melting-range fluoropolymer usually has excellent heat resistance, chemical stability and adhesion properties. It can melt at a low temperature and penetrate into the fiberglass to form a uniform coating, thus strongly bonding the PTEF ultra-fine fiber membrane 102 to the fiberglass braided layer 101 and improving the peel strength.

[0023] Among them, there is a non-glue bonding fixation between the fiberglass braided layer 101, the PTEF ultra-fine fiber membrane 102 and the polyvinyl alcohol ultra-fine fiber membrane 103, and there is also a non-glue bonding fixation between the PTFE hollow fiber membrane 10, the first PTFE flat membrane 11 and the first PTFE flat membrane 11. The non-glue bonding technology means that during the manufacturing process of the fabric, the bonding between fiber materials is achieved by non-adhesive means. For example, through physical methods such as ultrasonic welding and hot press welding, or chemical means such as "conductive glue" formed by in-situ chemical reactions, the fiber materials are firmly connected together. In the specific use process, during the sintering process, the PTEF ultra-fine fiber membrane 102 decomposes, and at the same time, taking advantage of the characteristic that the thermal shrinkage of the PTEF ultra-fine fiber membrane 102 is higher than that of the fiberglass braided layer 101, the PTEF ultra-fine fiber membrane 102 shrinks inward, further combining with the fiberglass braided layer 101, thus having excellent interfacial adhesion strength and improving the peel strength.

[0024] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. A PTFE fiber braided layer with an anti-separation structure, comprising a PTFE hollow fiber membrane (10), characterized in that: The PTFE hollow fiber membrane (10) is composed of a glass fiber woven layer (101), a PTEF ultrafine fiber membrane (102) and a polyvinyl alcohol ultrafine fiber membrane (103); the upper surface of the glass fiber woven layer (101) is covered with the PTEF ultrafine fiber membrane (102); the upper surface of the PTEF ultrafine fiber membrane (102) is covered with the polyvinyl alcohol ultrafine fiber membrane (103); the upper surface of the PTFE hollow fiber membrane (10) is covered with a first PTFE flat membrane (11); and the lower surface of the PTFE hollow fiber membrane (10) is covered with a second PTFE flat membrane (12).

2. The PTFE fiber braided layer with an anti-separation structure according to claim 1, characterized in that: The glass fiber braided layer (101) is woven with a plurality of pores (1011).

3. The PTFE fiber braided layer with an anti-separation structure according to claim 1, characterized in that: The PTFE hollow fiber membrane (10) is formed by uniaxial stretching, and the first PTFE flat membrane (11) and the second PTFE flat membrane (12) are formed by biaxial stretching.

4. The PTFE fiber braided layer with an anti-separation structure according to claim 1, characterized in that: The outer surface of the glass fiber braided layer (101) is sprayed with a low melting range fluorine-containing polymer (1012).

5. The PTFE fiber braided layer with an anti-separation structure according to claim 1, characterized in that: The glass fiber braided layer (101), the PTEF ultrafine fiber membrane (102) and the polyvinyl alcohol ultrafine fiber membrane (103) are fixed in a glue-free bonding manner.

6. The PTFE fiber braided layer with an anti-separation structure according to claim 1, characterized in that: The PTFE hollow fiber membrane (10) and the first PTFE flat membrane (11) are fixed to each other in a glue-free bonding manner.

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