Novel air-permeable membrane with cross-linked structure

Abstract

The utility model belongs to the technical field of breathable films, and particularly relates to a novel breathable film with a cross-linked structure, which comprises a base layer and a cross-linked layer, the cross-linked layer is arranged on at least one surface of the base layer and is formed by cross-linking of a cross-linking agent and polymer molecules on the surface of the base layer, and the cross-linked layer is arranged on the base layer. The base layer is made of polyethylene glycol terephthalate, polyethylene naphthalate or polycarbonate, the thickness of the base layer is set to be 10-50 microns, the cross-linking agent is an acrylate compound or an isocyanate compound with polyfunctional groups, the thickness of the cross-linking layer is set to be 5-20 microns, and the cross-linking agent is a polyfunctional group. According to the cross-linked ultra-high-strength breathable film, by reasonably designing the structures of the base layer and the cross-linked layer and adding a functional coating according to requirements, perfect combination of ultra-high strength and good breathability is achieved, and the cross-linked ultra-high-strength breathable film has wide application prospects in many fields.

Description

TECHNICAL FIELD

[0001] The utility model belongs to breathable film technical field, concretely relates to a novel crosslinking structure's breathable film. BACKGROUND

[0002] Breathable film has wide application in medical treatment, packaging, clothing and many other industries. Traditional breathable film is usually difficult to take into account high strength and good breathability. In some special application scenarios, such as high-performance medical protective products, high-barrier packaging, etc., the breathable film needs to withstand large mechanical stress and ensure smooth gas permeation, and the existing breathable film material is difficult to meet these stringent requirements. SUMMARY

[0003] To solve the problems in the background art, the utility model provides a novel crosslinking structure's breathable film, including base layer and crosslinking layer, the crosslinking layer is arranged on at least one surface of base layer, and is crosslinked with the polymer molecules of base layer surface through crosslinking agent and forms.

[0004] As a novel crosslinking structure's breathable film of the utility model, preferably, the base layer adopts polyethylene terephthalate, polyethylene naphthalate or polycarbonate, and the thickness of the base layer is set to 10-50 microns.

[0005] As a novel crosslinking structure's breathable film of the utility model, preferably, the crosslinking agent is a multi-functional acrylate compound or isocyanate compound, and the thickness of the crosslinking layer is set to 5-20 microns.

[0006] As a novel crosslinking structure's breathable film of the utility model, preferably, it further includes a functional coating arranged on the surface of the crosslinking layer, and the functional coating is one or a combination of multiple of an antistatic coating, an antibacterial coating or a hydrophobic coating.

[0007] As a novel crosslinking structure's breathable film of the utility model, preferably, the thickness of the antistatic coating is set to 1-5 microns, the thickness of the antibacterial coating is set to 0.5-3 microns, and the thickness of the hydrophobic coating is set to 1-3 microns.

[0008] Compared with the prior art, the utility model has the beneficial effects that:

[0009] The crosslinking ultra-high strength breathable film realizes the perfect combination of ultra-high strength and good breathability by reasonably designing the structure of the base layer and the crosslinking layer and adding a functional coating according to requirements, and has wide application prospects in many fields. BRIEF DESCRIPTION OF DRAWINGS

[0010] The accompanying drawings are used to provide further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0011] Figure 1 An internal level diagram of the novel cross-linking structure breathable film;

[0012] In the drawings:

[0013] 1, base layer; 2, cross-linking layer; 3, functional coating. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. EMBODIMENT

[0015] As Figure 1 indicated;

[0016] A novel cross-linking structure breathable film comprises a base layer 1 and a cross-linking layer 2.

[0017] In the present embodiment: to solve the technical problems existing in the prior art, as disclosed in the background art above, "the breathable film has a wide application in medical treatment, packaging, clothing and other industries. The traditional breathable film is usually difficult to balance high strength and good air permeability. In some special application scenarios, such as high-performance medical protective products, high-barrier packaging, etc., the breathable film needs to withstand large mechanical stress and ensure smooth gas permeation, and the existing breathable film material is difficult to meet these stringent requirements", in combination with actual use, this problem is obviously a real problem and is relatively difficult to solve. Therefore, to solve this technical problem, a novel cross-linking structure breathable film is provided on this basis.

[0018] As Figure 1 indicated in the drawings;

[0019] In combination with the above content, the cross-linking layer 2 is arranged on at least one surface of the base layer 1 and is formed by cross-linking the polymer molecules on the surface of the base layer 1 through a cross-linking agent.

[0020] In an optional embodiment, the base layer is made of polyethylene terephthalate, polyethylene naphthalate or polycarbonate, the thickness of the base layer is set to 10-50 microns, the cross-linking agent is a multi-functional acrylate compound or an isocyanate compound, and the thickness of the cross-linking layer is set to 5-20 microns.

[0021] The base layer is made of a polymer material with certain flexibility and initial strength, such as polyester materials such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or high-performance polymers such as polycarbonate (PC). The thickness of the base layer is in the range of 10-50 microns.

[0022] In an optional embodiment, a functional coating is further provided on the surface of the cross-linked layer, which is one or a combination of an antistatic coating, an antibacterial coating, or a hydrophobic coating. The thickness of the antistatic coating is set to 1-5 microns, the thickness of the antibacterial coating is set to 0.5-3 microns, and the thickness of the hydrophobic coating is set to 1-3 microns.

[0023] The cross-linked layer is formed by cross-linking reaction between the specific cross-linking agent and the polymer molecules on the surface of the base layer. The cross-linking agent can be a multi-functional acrylate compound or an isocyanate compound, etc. The thickness of the cross-linked layer is 5-20 microns. The cross-linked layer has a highly cross-linked three-dimensional network structure, which can effectively enhance the overall strength of the breathable film, including tensile strength, tear strength, and puncture resistance, etc. At the same time, there are small pore channels between the cross-linked networks, allowing gas molecules to diffuse freely through them, ensuring the breathability of the breathable film.

[0024] In an optional embodiment, a functional coating such as an antistatic coating, an antibacterial coating, or a hydrophobic coating, etc. is coated on the surface of the cross-linked layer. The antistatic coating can be a polymer coating containing conductive fillers such as carbon nanotubes, metal nanoparticles, etc., with a thickness of about 1-5 microns, which can effectively prevent the breathable film from attracting dust and other impurities due to static accumulation during use; the antibacterial coating can be a coating containing silver ion antibacterial agents or quaternary ammonium salt antibacterial agents, with a thickness of 0.5-3 microns, which gives the breathable film antibacterial properties, suitable for medical and food packaging fields; the hydrophobic coating can be a fluoropolymer coating, with a thickness of 1-3 microns, which makes the surface of the breathable film hydrophobic, preventing water penetration and stain contamination.

[0025] The preparation method of the utility model discloses:

[0026] First, the selected base polymer material is prepared into a base film through an extrusion film process, and the thickness is controlled in the range of 10-50 microns. Then, the crosslinking agent is uniformly coated on the surface of the base film, which can be achieved by spraying, dipping or coating, etc. After that, the crosslinking reaction is initiated by heating, ultraviolet irradiation or adding an initiator, etc. to fully crosslink the crosslinking agent with the surface polymer molecules of the base layer, forming a crosslinked layer with a thickness of 5-20 microns. If a functional coating is needed, the corresponding functional coating is coated on the surface of the crosslinked layer after the crosslinked layer is formed, using a similar coating process and controlling the coating thickness within the specified range. Finally, after drying, curing and other processing steps, the final crosslinked super-high-strength breathable film product is obtained.

[0027] Through performance testing of the breathable film prepared by the present application, the tensile strength can reach 200-500 MPa, which is much higher than that of traditional breathable films, while the air permeability can still be maintained at a relatively high level of 500-2000 g / m²·24h, meeting the requirements of various practical applications for strength and air permeability.

[0028] Finally, it should be noted that the above is only the preferred embodiment of the present application and is not intended to limit the present application. Although the present application 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 modification, equivalent substitution, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A novel crosslinked structure breathable film, characterized by: The present application relates to a functional coating layer for a substrate, and more particularly to a functional coating layer for a substrate, which comprises a base layer (1) and a cross-linking layer (2) provided on at least one surface of the base layer (1) and formed by cross-linking the polymer molecules of the surface of the base layer (1) with a cross-linking agent.

2. A breathable film of novel cross-linked structure according to claim 1, characterized by: The base layer (1) is made of polyethylene terephthalate, polyethylene naphthalate or polycarbonate, and the thickness of the base layer (1) is set to 10-50 micrometers.

3. A breathable film of novel crosslinked structure according to claim 1, characterized by: The cross-linking agent is a multi-functional acrylate compound or an isocyanate compound, and the thickness of the cross-linking layer (2) is set to 5-20 micrometers.

4. The breathable film of claim 1, wherein: The functional coating layer (3) provided on the surface of the cross-linking layer (2) is one or a combination of an antistatic coating layer, an antibacterial coating layer or a hydrophobic coating layer.

5. A breathable film of novel crosslinked structure according to claim 4, characterized by: The thickness of the antistatic coating layer is set to 1-5 micrometers, the thickness of the antibacterial coating layer is set to 0.5-3 micrometers, and the thickness of the hydrophobic coating layer is set to 1-3 micrometers.

Images