Vacuum breathable isolation structure

Abstract

The utility model provides a vacuum air-permeable isolation structure which comprises a vacuum bag film layer, an air-permeable layer and an isolation layer which are arranged in a stacked mode, and the vacuum air-permeable isolation structure is used in a pre-compaction process of a prepreg laying layer by compositing the three layers. Compared with the prior art, the pre-compaction device has the advantages that the process of paving three times at ordinary times can be simplified into one time, and the same vacuumizing and bubble discharging effect is realized, so that the pre-compaction time of a prepreg paving layer is effectively saved, the production efficiency is improved, and the production progress of a composite material workpiece is accelerated.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite material molding, and particularly relates to a vacuum breathable isolation structure. Background Art

[0002] With the development of the times and the advancement of science and technology, ordinary metal materials are gradually unable to meet people's needs. Composite materials, with their advantages of light weight and high strength, are gradually replacing metal materials and becoming one of the most widely used materials.

[0003] Prepreg, commonly known as molding compound, is a combination of continuous fibers and fabrics impregnated with resin under strictly controlled conditions. It serves as an intermediate in the manufacture of composite materials. Prepreg layup typically utilizes a pre-compacting process. This means that after each layer of prepreg is laid, a barrier film, breathable felt, and vacuum bagging film are sequentially applied to seal the prepreg between the container and the vacuum bag. The vacuum is then applied for a specified period of time to eliminate air bubbles generated during the prepreg layup process and improve the physical and chemical properties of the resulting composite material after curing.

[0004] However, since the isolation film, breathable felt and vacuum bag film need to be re-laid in sequence before each vacuuming in the pre-compaction process, for large parts or thick composite parts, the laying process will waste a lot of time, delay the production progress, and reduce production efficiency.

[0005] Therefore, in response to the above technical problems, it is urgent to develop a vacuum breathable isolation structure that can be vacuumed by only laying it once. Utility Model Content

[0006] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a vacuum breathable isolation structure, which is used in the pre-compaction process of prepreg plies. It can replace vacuum bag film, breathable felt and isolation film, simplifying the process that usually requires three layings to one, and can achieve the same vacuum extraction and bubble removal effect, thereby effectively saving pre-compaction time, thereby accelerating the production progress of composite material parts.

[0007] In order to achieve the purpose of this utility model, the utility model adopts the following technical solutions:

[0008] In a first aspect, the utility model provides a vacuum breathable isolation structure, which includes a vacuum bag film layer, a breathable layer and an isolation layer that are stacked.

[0009] The vacuum breathable isolation structure provided by the utility model includes a stacked vacuum bag film layer, a breathable layer and an isolation layer. By compounding the above three-layer structure, the obtained vacuum breathable isolation structure is used in the pre-compacting process of prepreg plies. The process that usually requires three laying processes can be simplified to one time, and the same vacuum extraction and bubble removal effect can be achieved, thereby effectively saving the pre-compacting time of the prepreg plies, thereby improving production efficiency and accelerating the production progress of composite material parts.

[0010] It should be noted that when the vacuum breathable isolation structure provided by the present invention is directly laid on the prepreg layer at one time, one side of the isolation layer is arranged close to the prepreg layer.

[0011] It should also be noted that the present invention does not impose any special restrictions on the preparation method of the provided vacuum breathable isolation structure; for example, the vacuum bag film layer, the breathable layer and the isolation layer can be directly bonded in sequence using an adhesive to obtain the vacuum breathable isolation structure.

[0012] As a preferred technical solution of the present invention, the length of the vacuum bag film layer is greater than the length of the isolation layer and greater than the length of the breathable layer, and the width of the vacuum bag film layer is greater than the width of the isolation layer and greater than the width of the breathable layer.

[0013] As a preferred technical solution of the present invention, the thickness of the vacuum bag film is 40 to 80 μm, for example, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm or 80 μm, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the said range.

[0014] As a preferred technical solution of the present invention, the vacuum bag film layer is any one of polyethylene vacuum bag film, polyamide 6 vacuum bag film or polyamide 66 vacuum bag film; and the above vacuum bag films are all existing materials.

[0015] As a preferred technical solution of the present invention, the breathable layer is breathable felt.

[0016] As the preferred technical solution of the present invention, the weight of the breathable felt is 100-400g / m 2 , for example 100g / m 2 , 150g / m 2 , 200g / m 2 , 250g / m 2 , 300g / m 2 , 350g / m 2 or 400g / m 2, as well as specific point values between the above point values. Due to space limitations and for the sake of brevity, this utility model no longer exhaustively lists the specific point values included in the said range.

[0017] As a preferred technical solution of the present invention, the breathable felt is polyester breathable felt or nylon breathable felt.

[0018] As a preferred technical solution of the present invention, the thickness of the isolation layer is 20 to 50 μm, for example, 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 34 μm, 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, 46 μm, 48 μm or 50 μm, as well as specific point values between the above point values. Due to limited space and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the said range.

[0019] As a preferred technical solution of the present invention, the isolation layer is an isolation film.

[0020] As a preferred technical solution of the present invention, the isolation membrane is a porous isolation membrane or a non-porous isolation membrane.

[0021] As a preferred technical solution of the present invention, the isolation membrane is a polyolefin isolation membrane, a polyvinyl formal isolation membrane, a polytetrafluoroethylene isolation membrane or an ethylene-tetrafluoroethylene copolymer isolation membrane, and the above isolation membranes are all existing materials.

[0022] As a preferred technical solution of the present invention, a first adhesive layer is further provided between the vacuum bag film layer and the breathable layer;

[0023] And / or, a second adhesive layer is further provided between the breathable layer and the isolation layer.

[0024] As a preferred technical solution of the present invention, the adhesive amount of the first adhesive layer and the second adhesive layer are independently 3 to 10 g / m 2 , for example 3g / m 2 , 4g / m 2 , 5g / m 2 , 6g / m 2 , 7g / m 2 , 8g / m 2 , 9g / m 2 or 10g / m 2 , as well as specific point values between the above point values. Due to space limitations and for the sake of brevity, this utility model no longer exhaustively lists the specific point values included in the said range.

[0025] For the vacuum breathable isolation structure provided by the present invention, there is no special limitation on the specific type of adhesive used in the first adhesive layer and the second adhesive layer, and existing conventional adhesives can be used; for example, the adhesives used include polyurethane, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polystyrene, polyacrylate, etc.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The vacuum breathable isolation structure provided by the utility model includes a stacked vacuum bag film layer, a breathable layer and an isolation layer. By compounding the above three-layer structure, the obtained vacuum breathable isolation structure is used in the pre-compacting process of prepreg plies. The process that usually requires three laying processes can be simplified to one time, and the same vacuum extraction and bubble removal effect can be achieved, thereby effectively saving the pre-compacting time of the prepreg plies, thereby improving production efficiency and accelerating the production progress of composite material parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic cross-sectional view of the vacuum breathable isolation structure provided by the present invention;

[0029] Among them, 1 is a vacuum bag film layer, 2 is a breathable layer, 3 is an isolation layer, 4 is a first adhesive layer, and 5 is a second adhesive layer. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0031] The following describes embodiments of the present invention in detail. 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0033] In a specific embodiment, the present invention provides a vacuum breathable isolation structure, the cross-sectional structure of which is shown in FIG. Figure 1As shown, it includes a vacuum bag film layer 1, a first adhesive layer 4, a breathable layer 2, a second adhesive layer 5 and an isolation layer 3 that are stacked;

[0034] In the length direction of the vacuum breathable isolation structure ( Figure 1 In the direction indicated by the arrow A), the vacuum bag film layer 1> the isolation layer 3> the breathable layer 2, and in the width direction of the vacuum breathable isolation structure (perpendicular to Figure 1 In the direction shown on the paper), the vacuum bag film layer 1 is larger than the isolation layer 3 and the breathable layer 2; the isolation layer 2 is limited to be larger than the breathable layer 2, so that the breathable layer 2 does not contact the prepreg, ensuring that the prepreg is not contaminated; and the vacuum bag film layer 1 is further limited to be larger than the isolation layer 3, so as to facilitate the pasting of sealing tape on the vacuum bag film layer 1 for vacuuming.

[0035] Wherein, the vacuum bag film layer 1 is a vacuum bag film.

[0036] The breathable layer 2 is a conventional commercially available breathable felt.

[0037] The isolation layer 3 is an isolation film.

[0038] In a preferred embodiment, the thickness of the vacuum bag film is 40 to 80 μm, specifically any one of polyethylene vacuum bag film, polyamide 6 vacuum bag film or polyamide 66 vacuum bag film, all of which are conventional commercially available products.

[0039] In a preferred embodiment, the weight of the breathable felt is 100 to 400 g / m 2 , specifically polyester breathable felt or nylon breathable felt, both of which are conventional commercially available products.

[0040] In a preferred embodiment, the isolation membrane has a thickness of 20 to 50 μm and is a porous isolation membrane or a non-porous isolation membrane, specifically any one of a polyolefin isolation membrane, a polyvinyl formal isolation membrane, a polytetrafluoroethylene isolation membrane or an ethylene-tetrafluoroethylene copolymer isolation membrane, all of which are conventional commercially available products.

[0041] In a preferred embodiment, the adhesive amount of the first adhesive layer 4 and the second adhesive layer 5 is independently 3 to 10 g / m 2 , all can be bonded with existing glue;

[0042] Illustratively, the types of glue used include polyurethane, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polystyrene, polyacrylate, and the like.

[0043] Through the above selection and limitation, the obtained vacuum breathable isolation structure can be used in the pre-compacting process of prepreg plies, which can simplify the laying process that usually requires three times to one time, thereby achieving the same vacuum bubble removal effect, thereby effectively saving the pre-compacting time of the prepreg plies, thereby improving production efficiency and accelerating the production progress of composite material parts.

[0044] Example 1

[0045] A vacuum breathable isolation structure, the cross-sectional structure diagram of which is as follows Figure 1 As shown, it includes a vacuum bag film layer 1, a first adhesive layer 4, a breathable layer 2, a second adhesive layer 5 and an isolation layer 3 that are stacked;

[0046] In the length direction of the vacuum breathable isolation structure ( Figure 1 In the direction indicated by the arrow A), the vacuum bag film layer 1> the isolation layer 3> the breathable layer 2, and in the width direction of the vacuum breathable isolation structure (perpendicular to Figure 1 (direction shown on the paper) the vacuum bag film 1> isolation layer 3> breathable layer 2;

[0047] Wherein, the vacuum bag film layer 1 is a polyethylene vacuum bag film with a thickness of 50 μm;

[0048] The breathable layer 2 has a gram weight of 300g / m 2 Polyester breathable felt;

[0049] The isolation layer 3 is a non-porous polyolefin isolation film with a thickness of 30 μm;

[0050] The first adhesive layer 4 and the second adhesive layer 5 are both polyurethane adhesive layers, and the adhesive amount is 5g / m 2 .

[0051] Performance testing:

[0052] The vacuum breathable isolation structure provided in Example 1 is used in the pre-compacting process of epoxy resin prepreg ply. It can be vacuumed directly after laying it once, and the effect of vacuuming and removing bubbles is the same as that of laying the isolation film, breathable felt and vacuum bag film in sequence.

[0053] It can be seen that the application of the vacuum breathable isolation structure provided by the present invention effectively saves the pre-compacting time of the prepreg layer, thereby improving production efficiency and accelerating the production progress of composite material parts.

[0054] The applicant declares that while the above-described embodiment of the present invention illustrates a vacuum breathable insulation structure, the present invention is not limited to the above-described specific embodiments. This does not imply that the present invention must rely on the above-described specific embodiments in order to be implemented. Persons skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the raw materials used, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A vacuum breathable isolation structure, characterized in that: The vacuum breathable isolation structure comprises a vacuum bag film layer, a breathable layer and an isolation layer which are stacked.

2. The vacuum breathable isolation structure according to claim 1, characterized in that: The length of the vacuum bag film layer is greater than the length of the isolation layer and greater than the length of the breathable layer, and the width of the vacuum bag film layer is greater than the width of the isolation layer and greater than the width of the breathable layer.

3. The vacuum breathable isolation structure according to claim 1, characterized in that: The thickness of the vacuum bag film layer is 40 to 80 μm.

4. The vacuum breathable insulation structure according to claim 1 or 2, characterized in that: The vacuum bag film layer is any one of a polyethylene vacuum bag film, a polyamide 6 vacuum bag film or a polyamide 66 vacuum bag film.

5. The vacuum breathable isolation structure according to claim 1, characterized in that: The breathable layer is breathable felt.

6. The vacuum breathable insulation structure according to claim 5, characterized in that: The air-permeable felt is polyester air-permeable felt or nylon air-permeable felt.

7. The vacuum breathable isolation structure according to claim 1, characterized in that: The thickness of the isolation layer is 20 to 50 μm.

8. The vacuum breathable isolation structure according to claim 7, characterized in that: The isolation layer is an isolation film.

9. The vacuum breathable isolation structure according to claim 8, characterized in that: The isolation film is any one of a polyolefin isolation film, a polyvinyl formal isolation film, a polytetrafluoroethylene isolation film or an ethylene-tetrafluoroethylene copolymer isolation film.

10. The vacuum breathable insulation structure according to claim 1 or 2, characterized in that: A first adhesive layer is also provided between the vacuum bag film layer and the breathable layer. And / or, a second adhesive layer is further provided between the breathable layer and the isolation layer.

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