CN219181748U - LCP composite reinforcement film - Google Patents
LCP composite reinforcement film Download PDFInfo
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- CN219181748U CN219181748U CN202223381235.9U CN202223381235U CN219181748U CN 219181748 U CN219181748 U CN 219181748U CN 202223381235 U CN202223381235 U CN 202223381235U CN 219181748 U CN219181748 U CN 219181748U
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Abstract
The utility model discloses an LCP composite reinforced film, which sequentially comprises an LCP composite film layer and a release paper layer, wherein the LCP composite film layer comprises an LCP film layer and an LCP film bonding layer, and the upper surface and the lower surface of the LCP film bonding layer are combined with the LCP film layer and the release paper layer in a hot-press bonding mode. The utility model adopts the low-melting-point LCP film to replace an adhesive as a bonding phase to bond the high-melting-point film and the release paper together, thereby not only improving the adhesion between the reinforcing film layers and improving the defect that the surface of the reinforcing film is easy to generate bubbles, but also having the advantages of environmental protection and environmental protection. Compared with the traditional PI reinforced film layer, the LCP composite reinforced film has extremely low water absorption rate, and the reliability of a flexible printed circuit is greatly improved.
Description
Technical Field
The utility model belongs to the technical field of flexible printed circuit boards, and particularly relates to an LCP composite reinforcement film for a flexible printed circuit board.
Background
The Flexible Printed Circuit (FPC) has catered to the development trend of electronic products such as light, thin, short and small by virtue of the unique advantages, but the characteristics lead to the defects such as bending, scratch, cracking and the like of the products in the application process, and meanwhile, the flexible printed circuit should have enough supporting strength during welding or plugging. In view of the above, it is necessary to apply a bonding reinforcing treatment to the FPC.
The reinforcing material adopted by the existing high-frequency flexible circuit board is mostly composed of Polyimide (PI) films and adhesives, but the PI films have higher moisture absorption (the water absorption rate is 0.5-2%), the interlayer adhesive force is obviously reduced after moisture absorption, and the peeling strength is reduced. In addition, because the types and the quality of the adhesives are uneven, the surface defects of bubbles, large glue overflow amount and the like on the surface of the reinforcing material are easily caused, and most adhesives used for the PI composite film contain halogen, so that the environment is polluted.
The Liquid Crystal Polymer (LCP) is a novel thermoplastic organic material, has excellent mechanical property, electrical property, heat resistance, extremely low moisture absorption rate and other characteristics, and is widely applied to the fields of electronics, electricity, automobiles, aerospace and the like, and the requirements of films prepared from the liquid crystal polymer on printed circuit boards are more and more strong due to the excellent comprehensive properties.
Disclosure of Invention
The utility model aims to provide an LCP composite reinforced film aiming at the technical problems, and the LCP composite reinforced film has the advantages of low water absorption, high peel strength and environmental protection.
The aim of the utility model can be achieved by the following technical scheme: the utility model provides a LCP composite reinforcement membrane, includes LCP composite film layer and release paper layer in proper order, the LCP composite film layer includes high melting point LCP film layer and low melting point LCP film layer, the upper and lower surface on low melting point LCP film layer through the mode of hot pressing laminating with high melting point LCP film layer with release paper layer combines.
Preferably, the high melting point LCP film layer comprises at least two layers of high melting point LCP film, with the low melting point LCP film layer disposed therebetween.
Preferably, the thickness of the high melting LCP film layer is 25-75 μm.
Further preferably, the thickness of the high melting point LCP film layer is 50 μm.
Preferably, the thickness of the low melting LCP film layer is from 10 to 50 μm.
Further preferably, the thickness of the low melting LCP film layer is 25 μm.
Preferably, the thickness of the release paper layer is 100-150 μm.
Further preferably, the thickness of the release paper layer is 120 μm.
Preferably, the melting point of the high melting point LCP film layer is at least 20 ℃ higher than the melting point of the low melting point LCP film layer.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model adopts the low-melting-point LCP film to replace an adhesive as a bonding phase to bond the high-melting-point film and the release paper together, thereby not only improving the adhesion between the reinforcing film layers and improving the defect that the surface of the reinforcing film is easy to generate bubbles, but also having the advantages of environmental protection and environmental protection.
2. Compared with the traditional PI reinforcing film layer, the LCP composite reinforcing film has extremely low water absorption rate, and can greatly improve the stability and reliability of FPC products.
Drawings
Fig. 1: schematic structural diagram of LCP composite reinforced film in example 1;
fig. 2: schematic structural diagram of LCP composite reinforced film in example 2;
fig. 3: the PI composite reinforced film structure of comparative example 1 is schematically shown.
Detailed Description
In the description of the present utility model, it should be understood that the terms "thickness," "upper," "lower," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
The utility model provides a LCP composite reinforcement membrane, includes LCP composite film layer and release paper layer in proper order, the LCP composite film layer includes high melting point LCP film layer and low melting point LCP film layer, the upper and lower surface on low melting point LCP film layer through the mode of hot pressing laminating with high melting point LCP film layer with release paper layer combines.
Preferably, the high melting point LCP film layer comprises at least two high melting point LCP films, with a low melting point LCP film layer disposed therebetween.
Preferably, the thickness of the high melting LCP film layer is 25-75 μm.
Further preferably, the thickness of the high melting point LCP film layer is 50 μm.
Preferably, the thickness of the low melting LCP film layer is from 10 to 50 μm.
Further preferably, the thickness of the low melting LCP film layer is 25 μm.
Preferably, the thickness of the release paper layer is 100-150 μm.
Further preferably, the thickness of the release paper layer is 120 μm.
Preferably, the melting point of the high melting point LCP film layer is at least 20 ℃ higher than the melting point of the low melting point LCP film layer.
Preferably, the LCP composite reinforced film is made by the following method: laminating a high-melting-point LCP film layer, a low-melting-point LCP film layer and a release paper layer in sequence from top to bottom, respectively hot-pressing aluminum foils on two side surfaces of a laminated substrate, wherein the lamination temperature is-10 ℃ of the melting point of the low-melting-point LCP film layer, the time is 2-10 min, and the pressure is 1-4 Mpa; and then peeling the aluminum foil from the laminated substrate to obtain the LCP composite reinforced film.
Example 1
As shown in FIG. 1, the LCP composite reinforced film comprises a high-melting-point LCP film layer 1, a low-melting-point LCP film layer 2 and a release paper layer 3 from top to bottom, wherein the thickness of the LCP film layer 1 is 50 mu m, the melting point is 310 ℃, the thickness of the LCP film layer 2 is 25 mu m, the melting point is 280 ℃, and the thickness of the release paper layer 3 is 120 mu m.
The preparation method of the LCP composite reinforced film comprises the following steps: laminating the high-melting-point LCP film layer 1, the low-melting-point LCP film layer 2 and the release paper layer 3 in sequence from top to bottom, and then respectively hot-pressing aluminum foils on two side surfaces of a laminated substrate, wherein the lamination temperature is 270 ℃, the time is 5min, and the pressure is 2Mpa; and then peeling the aluminum foil from the laminated substrate to obtain the LCP composite reinforced film.
Example 2
As shown in fig. 2, an LCP composite reinforcing film comprises, from top to bottom, a high melting point LCP film layer 1a, a low melting point LCP film layer 2a, a high melting point LCP film layer 1b, a low melting point LCP film layer 2b, and a release paper layer 3, wherein the thickness of the high melting point LCP film layer 1a and the high melting point LCP film layer 1b is 25 μm, the melting point is 310 ℃, the melting point of the low melting point LCP film layer 2a and the low melting point LCP film layer 2b is 280 ℃, the thickness is 25 μm, and the thickness of the release paper layer 3 is 120 μm.
The preparation method of the LCP composite reinforced film comprises the following steps: laminating a high-melting-point LCP film layer 1a, a low-melting-point LCP film layer 2a, a high-melting-point LCP film layer 1b, a low-melting-point LCP film layer 2b and a release paper layer 3 in sequence from top to bottom, and then respectively hot-pressing aluminum foils on two side surfaces of a laminated substrate at 270 ℃ for 5min under 2Mpa; and then peeling the aluminum foil from the laminated substrate to obtain the LCP composite reinforced film.
Example 3
The only difference from example 1 is that the LCP composite reinforced film is made by: laminating the high-melting-point LCP film layer 1, the low-melting-point LCP film layer 2 and the release paper layer 3 in sequence from top to bottom, and then respectively hot-pressing aluminum foils on two side surfaces of a laminated substrate at the laminating temperature of 280 for 2min under the pressure of 4Mpa; and then peeling the aluminum foil from the laminated substrate to obtain the LCP composite reinforced film.
Example 4
The only difference from example 1 is that the LCP composite reinforced film is made by: laminating the high-melting-point LCP film layer 1, the low-melting-point LCP film layer 2 and the release paper layer 3 in sequence from top to bottom, respectively hot-pressing aluminum foils on two side surfaces of a laminated substrate, wherein the lamination temperature is 290 ℃ of the melting point of the LCP film bonding layer, the time is 10min, and the pressure is 1Mpa; and then peeling the aluminum foil from the laminated substrate to obtain the LCP composite reinforced film.
Comparative example 1
The difference from the embodiment 1 is that the composite reinforced film comprises a PI film layer 1, an epoxy resin adhesive layer 2 and a release paper layer 3 from top to bottom in sequence, as shown in figure 3;
the preparation method of the composite reinforced film comprises the following steps: coating an epoxy adhesive 2 on one side of a PI film 1 at 60 ℃, pre-drying at 80 ℃ for 20min after coating, pressing for 5min at 180 ℃ under 2Mpa, attaching release paper 3 to the PI film 1 with the epoxy adhesive layer 2 pressed, and baking at 140 ℃ for 1h to obtain the PI composite reinforced film.
The composite reinforced films obtained in examples 1 to 4 and comparative example 1 were subjected to water absorption and bonding force and surface quality tests as follows, and the test results are shown in Table 1.
1. Water absorption rate: the GB/T6284 2008 method is used for testing;
2. peel strength: testing according to GB 2792-81 method;
3. apparent mass: and observing whether the surface of the reinforced film is smooth or not by naked eyes.
TABLE 1
As can be seen from Table 1, the LCP composite reinforced film obtained by the technical scheme of the utility model has water absorption rate lower than 0.03%, peel strength higher than 0.63N/mm and good apparent mass, is obviously superior to the PI reinforced film in the prior art, and is beneficial to greatly improving the stability and reliability of FPC products.
The utility model adopts the low-melting-point LCP film to replace the traditional adhesive as the bonding phase, controls the hot-pressing temperature to be in a molten state and has certain viscosity when the melting point of the low-melting-point LCP film is between-10 ℃ and the pressure is between 1 and 4Mpa, and the high-melting-point film still keeps a solid crystalline state, and the high-melting-point film and the release paper are bonded to be integrated by the molten-state low-melting-point LCP film, thereby not only improving the adhesion between the reinforcing film layers and improving the defect that the surface of the reinforcing film is easy to generate bubbles, but also having the advantages of environmental protection and environmental protection. In addition, compared with the traditional PI reinforcing film layer, the LCP composite reinforcing film has extremely low water absorption rate, and can greatly improve the stability and reliability of FPC products.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.
Claims (5)
1. The LCP composite reinforced film is characterized by sequentially comprising an LCP composite film layer and a release paper layer, wherein the LCP composite film layer comprises a high-melting-point LCP film layer and a low-melting-point LCP film layer, and the upper surface and the lower surface of the low-melting-point LCP film layer are combined with the high-melting-point LCP film layer and the release paper layer in a hot-pressing laminating mode.
2. The LCP composite reinforced film of claim 1, wherein the high melting LCP film layer comprises at least two high melting LCP films, the low melting LCP film layer disposed between the high melting LCP films.
3. An LCP composite reinforced film according to claim 1, wherein the thickness of the high melting LCP film layer is 25-75 μm.
4. The LCP composite reinforced film of claim 1, wherein the low melting LCP film layer has a thickness of 10-50 μιη.
5. The LCP composite reinforced film of claim 1, wherein the release paper layer has a thickness of 100-150 μιη.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223381235.9U CN219181748U (en) | 2022-12-16 | 2022-12-16 | LCP composite reinforcement film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223381235.9U CN219181748U (en) | 2022-12-16 | 2022-12-16 | LCP composite reinforcement film |
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| CN219181748U true CN219181748U (en) | 2023-06-13 |
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| CN202223381235.9U Active CN219181748U (en) | 2022-12-16 | 2022-12-16 | LCP composite reinforcement film |
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| CN (1) | CN219181748U (en) |
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