Double-layer hydrophobic membrane with high tensile strength

Abstract

The utility model discloses a double-layer hydrophobic membrane with high tensile strength, relates to the technical field of hydrophobic membranes, and aims to solve the problems that the existing double-layer hydrophobic membrane is compounded and fixed only by adopting a connecting strip, the structural strength is low, and the tensile property is poor. The outer layer reinforcing net is arranged on the front end face of the first PVDF hydrophobic membrane and the rear end face of the second PVDF hydrophobic membrane; the reinforcing net bonding layer is arranged between the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane; the micropores are formed in the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane, the outer wall and the inner wall of the reinforcing net bonding layer are connected with the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane in a hot melting and bonding mode through a first hot melting layer, and the inner wall of the outer layer reinforcing net is connected with the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane in a bonding mode through a second hot melting layer.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrophobic membranes, in particular to a double-layer hydrophobic membrane with high tensile strength. Background Art

[0002] The hydrophobic membrane is made of polytetrafluoroethylene (PTFE) and has natural hydrophobicity. It blocks liquids (water or oil) while ensuring the free passage of gases. It is widely used in various applications that require waterproof / oil-proof and breathable properties, such as removal of specific pollutants, membrane distillation, gas separation, full evaporation, emulsification, dehydration, etc.

[0003] The existing hydrophobic membrane, such as the PTFE hydrophobic membrane named in the announcement number CN217340859U, relates to the field of hydrophobic membrane technology, including a first hydrophobic membrane and a second hydrophobic membrane, the second hydrophobic membrane is arranged on the top of the first hydrophobic membrane, a connecting strip is fixedly arranged on the top of the first hydrophobic membrane, and the top of the connecting strip is fixedly connected to the bottom end of the second hydrophobic membrane, and micropores are opened through the top of the second hydrophobic membrane.

[0004] However, the above double-layer hydrophobic membranes are only fixed by connecting strips, which has low structural strength and poor tensile performance. Therefore, we propose a double-layer hydrophobic membrane with high tensile strength to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a double-layer hydrophobic membrane with high tensile strength to solve the problem in the above background technology that the existing double-layer hydrophobic membranes are only fixed by connecting strips, have low structural strength and poor tensile performance.

[0006] To achieve the above object, the utility model provides the following technical solution: a double-layer hydrophobic membrane with high tensile strength, comprising a first PVDF hydrophobic membrane and a second PVDF hydrophobic membrane;

[0007] Also includes:

[0008] An outer reinforcing mesh, which is arranged on the front end surface of the first PVDF hydrophobic membrane and the rear end surface of the second PVDF hydrophobic membrane;

[0009] a reinforcing mesh adhesive layer disposed between the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane;

[0010] The micropores are arranged inside the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane.

[0011] Preferably, the outer wall and inner wall of the reinforcement mesh adhesive layer are hot-melt bonded to the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane through a first hot-melt layer, and the inner wall of the outer layer reinforcement mesh is bonded to the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane through a second hot-melt layer.

[0012] Preferably, the reinforcement mesh adhesive layer and the outer reinforcement mesh are both made of EVA material.

[0013] Preferably, the diameter of the micropores is 0.1-10 um.

[0014] Preferably, a nano-hydrophobic layer is provided on the outer walls of the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The hydrophobic membrane of the utility model is composed of a double-layer composite of a first PVDF hydrophobic membrane and a second PVDF hydrophobic membrane. An outer reinforcing mesh and a reinforcing mesh adhesive layer are hot-fused on the surface and between the two layers of PVDF hydrophobic membranes, respectively. The arrangement of the reinforcing mesh adhesive layer and the outer reinforcing mesh, relying on the mesh structure, improves the tensile strength of the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane after composite, and solves the problem that the existing double-layer hydrophobic membranes are only compositely fixed with connecting strips, with low structural strength and poor tensile performance.

[0017] 2. By setting a number of 0.1-10um micropores inside the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane, the micropores can isolate water molecules and ensure the passage of gas, and the composite mesh structure will not affect the air permeability of the micropores inside the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane due to the mesh gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the first PVDF hydrophobic membrane and the second PVDF hydrophobic membrane in the split state of the utility model;

[0020] Figure 3 It is a side structural schematic diagram of the utility model;

[0021] In the figure: 1. first PVDF hydrophobic membrane; 2. second PVDF hydrophobic membrane; 3. reinforcement mesh adhesive layer; 4. micropores; 5. outer reinforcement mesh; 6. first hot melt layer; 7. second hot melt layer; 8. nano hydrophobic layer. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] See also Figure 1-3 , the utility model provides an embodiment: a double-layer hydrophobic membrane with high tensile strength, comprising a first PVDF hydrophobic membrane 1 and a second PVDF hydrophobic membrane 2;

[0024] Also includes:

[0025] An outer reinforcing mesh 5 is arranged on the front end surface of the first PVDF hydrophobic membrane 1 and the rear end surface of the second PVDF hydrophobic membrane 2;

[0026] A reinforcing mesh adhesive layer 3, which is disposed between the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2;

[0027] The micropores 4 are arranged inside the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 .

[0028] See also Figure 3 The outer wall and the inner wall of the reinforcement mesh adhesive layer 3 are both hot-melt-bonded to the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 through the first hot-melt layer 6, and the inner wall of the outer reinforcement mesh 5 is bonded to the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 through the second hot-melt layer 7. The setting of the reinforcement mesh adhesive layer 3 and the outer reinforcement mesh 5 relies on the mesh structure to improve the tensile strength of the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 after compounding, and the mesh gap of the mesh structure does not affect the air permeability of the micropores 4 inside the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2.

[0029] Furthermore, the reinforcing mesh adhesive layer 3 and the outer reinforcing mesh 5 are both made of EVA material, which is a high-strength and high-elasticity material. The reinforcing mesh adhesive layer 3 and the outer reinforcing mesh 5 made of EVA are compounded with the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2, which can significantly improve the structural strength.

[0030] Furthermore, the diameter of the micropores 4 is 0.1-10 um, which can isolate water molecules and ensure the passage of gas.

[0031] See also Figure 3 A nano-hydrophobic layer 8 is disposed on the outer walls of the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 , and the nano-hydrophobic layer 8 can further improve the hydrophobic properties of the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 .

[0032] Working principle: When in use, the hydrophobic membrane is composed of a first PVDF hydrophobic membrane 1 and a second PVDF hydrophobic membrane. The outer reinforcing mesh 5 and the reinforcing mesh adhesive layer 3 are hot-melted on the surface and between the two layers of PVDF hydrophobic membranes. The setting of the reinforcing mesh adhesive layer 3 and the outer reinforcing mesh 5 improves the tensile strength of the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 after the composite, and the mesh gap of the mesh structure does not affect the air permeability of the micropores 4 inside the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2. The reinforcing mesh adhesive layer 3 and the outer reinforcing mesh 5 are both made of EVA material. EVA is a high-strength and high-elasticity material. The reinforcement mesh adhesive layer 3 and the outer reinforcement mesh 5 made of EVA are compounded with the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2, which can significantly improve the structural strength. A number of 0.1-10um micropores 4 are arranged in the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 to isolate water molecules and ensure the passage of gas. The outer walls of the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2 are provided with a nano-hydrophobic layer 8, which can further improve the hydrophobic properties of the first PVDF hydrophobic membrane 1 and the second PVDF hydrophobic membrane 2.

[0033] It is obvious 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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A double-layer hydrophobic membrane with high tensile strength, comprising a first PVDF hydrophobic membrane (1) and a second PVDF hydrophobic membrane (2); Features: Also includes: An outer reinforcing mesh (5) is arranged on the front end surface of the first PVDF hydrophobic membrane (1) and the rear end surface of the second PVDF hydrophobic membrane (2); A reinforcing mesh adhesive layer (3), which is arranged between the first PVDF hydrophobic film (1) and the second PVDF hydrophobic film (2); Micropores (4) are arranged inside the first PVDF hydrophobic membrane (1) and the second PVDF hydrophobic membrane (2).

2. A double-layer hydrophobic membrane with high tensile strength according to claim 1, characterized in that: The outer wall and the inner wall of the reinforcement mesh adhesive layer (3) are both connected to the first PVDF hydrophobic film (1) and the second PVDF hydrophobic film (2) by hot-melt bonding via a first hot-melt layer (6), and the inner wall of the outer layer reinforcement mesh (5) is connected to the first PVDF hydrophobic film (1) and the second PVDF hydrophobic film (2) by bonding via a second hot-melt layer (7).

3. A double-layer hydrophobic membrane with high tensile strength according to claim 1, characterized in that: The reinforcement mesh adhesive layer (3) and the outer reinforcement mesh (5) are both made of EVA material.

4. A double-layer hydrophobic membrane with high tensile strength according to claim 1, characterized in that: The diameter of the micropore (4) is 0.1-10 um.

5. A double-layer hydrophobic membrane with high tensile strength according to claim 1, characterized in that: A nano-hydrophobic layer (8) is provided on the outer walls of the first PVDF hydrophobic membrane (1) and the second PVDF hydrophobic membrane (2).

Images