Cold-resistant and attenuation-resistant hot melt adhesive film

Abstract

The utility model relates to the technical field of hot melt adhesive films, in particular to a cold-resistant and attenuation-resistant hot melt adhesive film which comprises a film layer, a high-adhesion polyester adhesive layer and a double-coating layer which are sequentially attached to one another from top to bottom, the double-coating layer comprises a cold-resistant glue layer and an attenuation-resistant glue layer, the lower surface of the high-adhesion polyester glue layer is attached to the upper surface of the cold-resistant glue layer, and the lower surface of the cold-resistant glue layer is attached to the upper surface of the attenuation-resistant glue layer; the thickness of the cold-resistant rubber layer is 6-22 [mu] m, and the thickness of the attenuation-resistant rubber layer is 5-25 [mu] m. According to the cold-resistant and attenuation-resistant hot melt adhesive film provided by the scheme, the cold-resistant performance and attenuation-resistant performance of the hot melt adhesive film can be considered, meanwhile, the hot melt adhesive film also has relatively high metal bonding force, the stability between hierarchical structures is high, and the defects in the prior art can be effectively overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of hot melt adhesive films, in particular to a cold-resistant and decay-resistant hot melt adhesive film. Background Art

[0002] FFC cable, also known as Fexibe Flat Cable (FFC), is a new type of data cable made by pressing two layers of insulating material with tinned flat copper wire sandwiched between them. It has the advantages of being soft and can be bent and folded at will.

[0003] The existing FFC cable uses a hot melt adhesive film to achieve hot melt bonding of the insulating material and the tinned flat copper wire. The hot melt adhesive film is a film with a certain thickness made of a material that can melt and bond the adherends. The hot melt adhesive film is placed between the adherends to achieve hot melt bonding.

[0004] In the existing hot-melt adhesive film products, it is always difficult to achieve a balance between cold resistance and attenuation resistance. Generally speaking, hot-melt adhesive films with better cold resistance generally have poor attenuation resistance, and hot-melt adhesive films with better attenuation resistance generally have poor cold resistance. The above situation greatly limits the overall use value of the hot-melt adhesive film. Therefore, there is an urgent need to develop a new hot-melt adhesive film structure to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a cold-resistant and attenuation-resistant hot-melt adhesive film, which is beneficial to taking into account both the cold-resistant performance and attenuation-resistant performance of the hot-melt adhesive film, and at the same time has a higher metal adhesion force and high stability between the hierarchical structures, which can effectively overcome the shortcomings of the prior art.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A cold-resistant and decay-resistant hot-melt adhesive film, comprising a film layer, a high-adhesion polyester adhesive layer and a double coating layer which are sequentially attached to each other from top to bottom;

[0008] The double coating layer includes a cold-resistant adhesive layer and a decay-resistant adhesive layer, and the lower surface of the high-adhesion polyester adhesive layer is bonded to the upper surface of the cold-resistant adhesive layer, and the lower surface of the cold-resistant adhesive layer is bonded to the upper surface of the decay-resistant adhesive layer;

[0009] The thickness of the cold-resistant adhesive layer is 6 to 22 μm, and the thickness of the attenuation-resistant adhesive layer is 5 to 25 μm.

[0010] Preferably, the thickness of the double coating layer is 25-42 μm.

[0011] Preferably, the adhesion of the high-adhesion polyester adhesive layer to the film layer is ≥1.5kg / 25.4mm, and the adhesion of the high-adhesion polyester adhesive layer to the cold-resistant adhesive layer is ≥2.5kg / 25.4mm.

[0012] Preferably, the thickness of the cold-resistant adhesive layer is 15 μm, and the thickness of the attenuation-resistant adhesive layer is 19 μm.

[0013] Preferably, the thickness of the high-adhesion polyester adhesive layer is 1 to 5 μm.

[0014] Preferably, the film layer has a thickness of 10 to 65 μm.

[0015] Preferably, the film layer is a PET film.

[0016] The technical solution provided by the embodiment of the utility model may have the following beneficial effects:

[0017] 1. By setting a double coating layer with cold-resistant and attenuation-resistant functions on the lower surface of the high-adhesion polyester adhesive layer, not only can the cold-resistant and attenuation-resistant properties of the hot-melt adhesive film be taken into account, but also the metal adhesion of the hot-melt adhesive film can be effectively improved.

[0018] 2. The thickness of the cold-resistant adhesive layer and the attenuation-resistant adhesive layer is limited to ensure the adhesion between the double coating layer and the high-adhesion polyester adhesive layer, making the two difficult to separate. Not only can the metal adhesion of the hot-melt adhesive film reach more than 35 grams, and the cold-resistant and attenuation-resistant performances are significantly enhanced, but it can also effectively improve the adhesion between the various hierarchical structures in the hot-melt adhesive film, thereby enhancing the stability of the overall structure and extending the service life of the hot-melt adhesive film. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a cold-resistant and decay-resistant hot-melt adhesive film of the utility model.

[0020] Among them: a film layer 1, a high-adhesion polyester adhesive layer 2, a double coating layer 3, a cold-resistant adhesive layer 31, and an attenuation-resistant adhesive layer 32. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] The technical solution provides a cold-resistant and decay-resistant hot-melt adhesive film, comprising a film layer 1, a high-adhesion polyester adhesive layer 2 and a double coating layer 3 which are sequentially bonded to each other from top to bottom;

[0023] The double coating layer 3 includes a cold-resistant adhesive layer 31 and a decay-resistant adhesive layer 32, and the lower surface of the high-adhesion polyester adhesive layer 2 is bonded to the upper surface of the cold-resistant adhesive layer 31, and the lower surface of the cold-resistant adhesive layer 31 is bonded to the upper surface of the decay-resistant adhesive layer 32;

[0024] The thickness of the cold-resistant adhesive layer 31 is 6 to 22 μm, and the thickness of the attenuation-resistant adhesive layer 32 is 5 to 25 μm.

[0025] In existing hot-melt adhesive film products, cold resistance and attenuation resistance are two properties that are difficult to balance. Generally speaking, hot-melt adhesive films with better cold resistance generally have poor attenuation resistance, and hot-melt adhesive films with better attenuation resistance generally have poor cold resistance. The above situation greatly limits the overall use value of the hot-melt adhesive film.

[0026] Therefore, in order to solve the above technical problems, the present technical solution proposes a cold-resistant and decay-resistant hot melt adhesive film, such as Figure 1 As shown, by arranging a double coating layer 3 with cold resistance and attenuation resistance functions on the lower surface of the high-adhesion polyester adhesive layer 2, not only can the cold resistance and attenuation resistance of the hot melt adhesive film be taken into account, but also the metal adhesion of the hot melt adhesive film can be effectively improved. At the same time, this solution further limits the thickness of the cold-resistant adhesive layer 31 and the attenuation-resistant adhesive layer 32 to ensure the adhesion between the double coating layer 3 and the high-adhesion polyester adhesive layer 2, so that the two are not easy to separate, not only the metal adhesion of the hot melt adhesive film can reach more than 35 grams, the cold resistance and attenuation resistance performance are significantly enhanced, but also the adhesion between the various hierarchical structures in the hot melt adhesive film can be effectively improved, thereby enhancing the stability of the overall structure and extending the service life of the hot melt adhesive film.

[0027] It should be noted that the cold-resistant adhesive layer 31 of the present scheme is a pre-coating layer with cold-resistant properties in the prior art, which can be coated by the cold-resistant pre-coating agent in the Chinese invention patent with publication number CN109535944A; in addition, the attenuation-resistant adhesive layer 32 of the present scheme is also a pre-coating layer with attenuation-resistant properties in the prior art, which can be the adhesive layer in the Chinese invention patent with publication number CN108682495A.

[0028] To further illustrate, the thickness of the double coating layer 3 is 25-42 μm.

[0029] In a preferred embodiment of the present technical solution, the total thickness of the double coating layer 3 is optimized, which is more conducive to making the overall structure of the hot melt adhesive film lighter while taking into account the cold resistance and attenuation resistance performance.

[0030] To further illustrate, the adhesion of the high-adhesion polyester adhesive layer 2 to the film layer 1 is ≥1.5kg / 25.4mm, and the adhesion of the high-adhesion polyester adhesive layer 2 to the cold-resistant adhesive layer 31 is ≥2.5kg / 25.4mm.

[0031] In addition, in order to further improve the adhesion between the various hierarchical structures in the hot melt adhesive film, thereby enhancing the stability of the overall structure of the hot melt adhesive film, this scheme also optimizes the adhesion of the high adhesion polyester adhesive layer 2 to the film layer 1 bonded to its upper and lower surfaces and the adhesion of the cold-resistant adhesive layer 31.

[0032] To further illustrate, the thickness of the cold-resistant adhesive layer 31 is 15 μm, and the thickness of the attenuation-resistant adhesive layer 32 is 19 μm.

[0033] To further illustrate, the thickness of the high-adhesion polyester adhesive layer 2 is 1-5 μm.

[0034] In another preferred embodiment of the present technical solution, the thickness of the high-adhesion polyester adhesive layer 2 is also optimized, which is more conducive to taking into account both the adhesion and thickness of the high-adhesion polyester adhesive layer 2.

[0035] To further illustrate, the film layer 1 has a thickness of 10 to 65 μm.

[0036] To further explain, the film layer 1 is a PET film.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0039] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0041] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0043] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A cold-resistant and decay-resistant hot melt adhesive film, characterized in that: It includes a film layer, a high-adhesion polyester adhesive layer and a double coating layer which are sequentially laminated to each other from top to bottom; The double coating layer includes a cold-resistant adhesive layer and a decay-resistant adhesive layer, and the lower surface of the high-adhesion polyester adhesive layer is bonded to the upper surface of the cold-resistant adhesive layer, and the lower surface of the cold-resistant adhesive layer is bonded to the upper surface of the decay-resistant adhesive layer; The thickness of the cold-resistant adhesive layer is 6 to 22 μm, and the thickness of the attenuation-resistant adhesive layer is 5 to 25 μm.

2. The cold-resistant and decay-resistant hot melt adhesive film according to claim 1, characterized in that: The thickness of the double coating layer is 25-42 μm.

3. The cold-resistant and decay-resistant hot melt adhesive film according to claim 1, characterized in that: The adhesion of the high-adhesion polyester adhesive layer to the film layer is ≥1.5kg / 25.4mm, and the adhesion of the high-adhesion polyester adhesive layer to the cold-resistant adhesive layer is ≥2.5kg / 25.4mm.

4. The cold-resistant and decay-resistant hot melt adhesive film according to claim 2, characterized in that: The thickness of the cold-resistant adhesive layer is 15 μm, and the thickness of the attenuation-resistant adhesive layer is 19 μm.

5. The cold-resistant and decay-resistant hot melt adhesive film according to claim 1, characterized in that: The thickness of the high-adhesion polyester adhesive layer is 1-5 μm.

6. The cold-resistant and decay-resistant hot melt adhesive film according to claim 1, characterized in that: The thickness of the film layer is 10-65 μm.

7. The cold-resistant and decay-resistant hot melt adhesive film according to claim 1, characterized in that: The film layer is a PET film.

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