Prepreg tape

Abstract

The utility model relates to the technical field of prepreg tape production, in particular to a prepreg tape. The prepreg tape comprises a toughening and reinforcing type PET foaming core layer and PET film outer layers compounded on the upper surface and the lower surface of the toughening and reinforcing type PET foaming core layer, wherein the surfaces of the PET film outer layers are subjected to low-temperature plasma treatment to form tackifying layers; a fiber skeleton is arranged in the toughened and reinforced PET foaming core layer; the fiber skeleton is a 0-degree fiber reinforcing layer and / or a 90-degree fiber reinforcing layer and / or plain woven fiber mesh cloth; the 0-degree fiber reinforcing layer is composed of a plurality of 0-degree fibers; the 90-degree fiber reinforcing layer is composed of a plurality of 90-degree fibers. The method is used for batch production of the PET foaming composite core material for the fan blade, the tackifying layer is formed by conducting low-temperature plasma treatment on the outer layer of the PET film, the bonding strength between the prepreg tape and the PET foaming base body is effectively improved, and the overall yield of the foaming composite core material for the fan blade is increased.

Description

Technical Field

[0001] This application relates to the field of prepreg tape production technology, and in particular to a prepreg tape. Background Technology

[0002] Prepreg tapes are high-performance structural composite materials used in aerospace, aviation, wind turbine blades, and shipbuilding. A prepreg tape consists of a matrix resin and oriented fiber bundles impregnated in the resin matrix. The matrix resin can be either a thermoplastic polymer or a thermosetting polymer. It's important to note that prepreg tapes with a thermosetting polymer matrix are significantly affected by factors such as time, temperature, and humidity, resulting in a relatively short shelf life. In contrast, prepreg tapes with a thermoplastic polymer matrix have a longer shelf life and a wider range of applications, making them a popular research area.

[0003] In the field of wind turbine blades, prepreg tape is mainly used in the preparation of foamed composite core materials for wind turbine blades. Existing prepreg tapes used in the production of foamed composite core materials for wind turbine blades consist of a thermoplastic PET matrix resin of the same material as the PET foam matrix and glass fiber filaments impregnated in the thermoplastic PET matrix resin and oriented, typically with the glass fiber filaments oriented at 0° (X-axis direction). Although the above-mentioned prepreg tape meets the production requirements of FPET Blocks in PET foamed composite core materials, it has been found in actual processing that the bonding strength between the prepreg tape and the PET foam matrix is ​​relatively weak, affecting the overall yield of the foamed composite core material for wind turbine blades and thus increasing the production cost of wind turbine blades. Therefore, this invention provides a prepreg tape and a roll containing the prepreg tape. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a prepreg tape.

[0005] The prepreg tape provided in this application is achieved through the following technical solution:

[0006] A prepreg tape includes a toughened and reinforced PET foam core layer and a PET film outer layer composited on the upper and lower surfaces of the toughened and reinforced PET foam core layer. The surface of the PET film outer layer facing away from the toughened and reinforced PET foam core layer is treated with low-temperature plasma to form an adhesive layer. A fiber skeleton is provided inside the toughened and reinforced PET foam core layer. The fiber skeleton is a 0° fiber reinforcement layer and / or a 90° fiber reinforcement layer and / or a plain woven fiber mesh. The 0° fiber reinforcement layer is composed of a plurality of 0° fibers. The 90° fiber reinforcement layer is composed of a plurality of 90° fibers.

[0007] This application relates to the mass production of PET foam composite core materials for wind turbine blades. By performing low-temperature plasma treatment on the outer layer of the PET film to form an adhesive layer, the bonding strength between the prepreg tape and the PET foam matrix is ​​effectively improved, increasing the overall yield of the foam composite core material for wind turbine blades and reducing the production cost of wind turbine blades. Furthermore, the prepreg tape rolls prepared with standard FPET Blocks are used in a dedicated mass production system for FPET Blocks, ensuring the bonding stability of the prepared PET foam composite core material and improving its overall mechanical strength for mass production of PET foam composite core materials for wind turbine blades.

[0008] Preferably, the thickness of the outer PET film layer is 25-200 μm; the thickness of the toughened and reinforced PET foam core layer is 150-2000 μm; the toughened and reinforced PET foam core layer is obtained by extrusion melting, casting, stretching and cooling of TPEE toughened and reinforced PET masterbatch; the prepreg tape has a length of 1200 mm, a width of 1000 mm and a thickness of 0.1-2.4 mm.

[0009] Preferably, when the fiber skeleton is a 0° fiber reinforcement layer, the 0° fiber reinforcement layer is laid in the toughened and reinforced PET foam core layer in a multi-layer intermittent laying or a single-layer laying. The 0° fibers in the 0° fiber reinforcement layer include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber distributed along the X-axis direction.

[0010] Preferably, when the fiber skeleton is a 90° fiber reinforcement layer, the 90° fiber reinforcement layer is laid in the toughened and reinforced PET foam core layer in a multi-layer intermittent laying or a single-layer laying. The 90° fibers in the 90° fiber reinforcement layer include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber distributed along the X-axis direction.

[0011] Preferably, when the fiber skeleton is a plain-woven fiber mesh, and the mesh size of the plain-woven fiber mesh includes any one of 1mm*1mm, 2mm*2mm, 3mm*3mm, 5mm*5mm, 10mm*10mm, 15mm*15mm, and 20mm*20mm, the plain-woven fiber mesh is laid in a multi-layer intermittent laying or a single-layer laying in the toughened and reinforced PET foam core layer. The warp yarns of the plain-woven fiber mesh include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber, and the weft yarns of the plain-woven fiber mesh include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber.

[0012] Preferably, when the fiber skeleton is a 0° fiber reinforcement layer and a 90° fiber reinforcement layer, the 0° fiber reinforcement layer and the 90° fiber reinforcement layer are laid in the toughened and reinforced PET foam core layer in the form of 0° fiber reinforcement layer / 90° fiber reinforcement layer / 0° fiber reinforcement layer.

[0013] Preferably, when the fiber skeleton is a 0° fiber reinforcement layer and a plain weave fiber mesh, the 0° fiber reinforcement layer and the plain weave fiber mesh are laid in the toughened and reinforced PET foam core layer in the following manner: 0° fiber reinforcement layer / plain weave fiber mesh / 0° fiber reinforcement layer.

[0014] Preferably, when the fiber skeleton is a 90° fiber reinforcement layer and a plain weave fiber mesh, the 90° fiber reinforcement layer and the plain weave fiber mesh are laid in the toughened and reinforced PET foam core layer in the following manner: 90° fiber reinforcement layer / plain weave fiber mesh / 90° fiber reinforcement layer.

[0015] Preferably, when the fiber skeleton is a 0° fiber reinforcement layer, a 90° fiber reinforcement layer, and a plain woven fiber mesh, the 0° fiber reinforcement layer, the 90° fiber reinforcement layer, and the plain woven fiber mesh are laid in the toughened and reinforced PET foam core layer in the following manner: 0° fiber reinforcement layer / plain woven fiber mesh / 90° fiber reinforcement layer; or the 0° fiber reinforcement layer, the 90° fiber reinforcement layer, and the plain woven fiber mesh are laid in the toughened and reinforced PET foam core layer in the following manner: 0° fiber reinforcement layer / 90° fiber reinforcement layer / plain woven fiber mesh / 90° fiber reinforcement layer / 0° fiber reinforcement layer.

[0016] By adopting the above technical solutions, it can be ensured that the PET foam composite core material prepared by prepreg tape has good overall mechanical strength, which is conducive to the development and breakthrough of large-megawatt wind power generation products.

[0017] A prepreg roll material prepared using the above-mentioned prepreg tape includes a first release paper, a second release paper, and a prepreg tape, wherein the prepreg tape is laminated between the first release paper and the second release paper; the adhesive strength between the prepreg tape and the first release paper is less than the adhesive strength between the second release paper and the prepreg tape.

[0018] By adopting the above technical solutions, continuous production of PET foam composite core material can be guaranteed, thereby improving the production efficiency of PET foam composite core material, reducing the total production cost of wind turbine blades, and facilitating the development and breakthrough of large-megawatt wind power generation products.

[0019] In summary, this application has the following advantages:

[0020] 1. This application is used for the production of PET foam composite core material for wind turbine blades, which can ensure the bonding stability of the prepared PET foam composite core material and improve the overall mechanical strength of the PET foam composite core material.

[0021] 2. The prepreg tape rolls provided in this application can ensure the continuous production of PET foam composite core materials, thereby improving the production efficiency of PET foam composite core materials and reducing the total production cost of wind turbine blades. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the prepreg tape structure in the embodiment.

[0023] Figure 2 This is a schematic diagram of the prepreg tape structure in the embodiment, showing the multi-layer distribution structure of the 0° fiber reinforcement layer.

[0024] Figure 3 This is a schematic diagram of the prepreg tape structure in the embodiment, showing the multi-layer distribution structure of the 90° fiber reinforcement layer.

[0025] Figure 4 This is a schematic diagram of the prepreg tape structure in the embodiment, showing the multi-layer distribution structure of the plain woven fiber mesh.

[0026] Figure 5 This is a schematic diagram of the prepreg tape structure in the embodiment, showing the laying method of the 0° fiber reinforcement layer and the 90° fiber reinforcement layer in the toughened and reinforced PET foam core layer.

[0027] Figure 6 This is a schematic diagram of the prepreg tape structure in the embodiment, showing the laying method of the 0° fiber reinforcement layer and plain woven fiber mesh in the toughened and reinforced PET foam core layer.

[0028] Figure 7 This is a schematic diagram of the prepreg tape structure in the embodiment, showing one of the laying methods of the 90° fiber reinforcement layer 31 and the plain woven fiber mesh in the toughened and reinforced PET foam core layer.

[0029] Figure 8 This is a schematic diagram of the prepreg tape structure in the embodiment, showing the second method of laying the 90° fiber reinforcement layer 31 and the plain woven fiber mesh in the toughened and reinforced PET foam core layer.

[0030] Figure 9 This is a schematic diagram of the prepreg roll structure in the embodiment.

[0031] Figure 10 This is a schematic diagram of the structure of the first release paper and the second release paper in the prepreg roll material in the embodiment.

[0032] In the diagram, 1. Toughened and reinforced PET foam core layer; 2. PET film outer layer; 20. Adhesive layer; 3. Fiber skeleton; 31. 0° fiber reinforcement layer; 32. 90° fiber reinforcement layer; 33. Plain woven fiber mesh; 4. First release paper; 41. Non-silicone oil covered area A; 42. Silicone oil covered area A; 5. Second release paper; 51. Non-silicone oil covered area B; 52. Silicone oil covered area B. Detailed Implementation

[0033] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. Example

[0034] Reference Figure 1 A prepreg tape includes a toughened and reinforced PET foam core layer 1 with a thickness of 150-2000 μm and a PET film outer layer 2 composited on the upper and lower surfaces of the toughened and reinforced PET foam core layer 1, wherein the thickness of the PET film outer layer 2 is 25-200 μm.

[0035] The toughened and reinforced PET foam core layer 1 is prepared by extrusion melting, casting, stretching, and cooling of TPEE toughened and reinforced PET masterbatch. The TPEE toughened and reinforced PET masterbatch is independently developed and produced by the applicant, and its technical solution is specifically disclosed in the invention patent "A method for preparing PET foam composite core material for wind turbine blades". To facilitate understanding of this technical solution, the inventors will again explain the TPEE toughened and reinforced PET masterbatch.

[0036] The first type of TPEE toughening and reinforcing PET masterbatch is made from the following raw materials in the following weight percentages: 35% TPEE resin LN5355HR, 5% compatibilizer - W5F polyester compatibilizer, 1% PET adhesion promoter 9041, 0.8% antioxidant 1024, 0.2% antioxidant 168, 0.8% UV stabilizer - UV-531, 1% lubricant - zinc stearate, 0.5% mold release agent PETS PT100, 5% filler (2000 mesh ultrafine calcium carbonate and zinc oxide whiskers in a mass ratio of 19:1), and the balance is PET resin YS-Y01.

[0037] The second type of TPEE toughening and reinforcing PET masterbatch is made from the following raw materials by weight percentage: 40% TPEE resin LN5355HR, 4% compatibilizer - W5F polyester compatibilizer, 1.5% PET adhesion promoter 9041, 0.8% antioxidant 1024, 0.2% antioxidant 168, 0.8% UV stabilizer - UV-531, 1% lubricant - zinc stearate, 0.5% mold release agent PETS PT100, 8wt% thermally conductive filler (ultrafine spherical alumina and carbon nanotubes in a mass ratio of 19:1), 2% reinforcing filler (2000-mesh ultrafine calcium carbonate and zinc oxide whiskers in a mass ratio of 19:1), and the balance being PET resin YS-Y01. The PEE toughened and reinforced PET composite film prepared using the second type of TPEE toughened and reinforced PET masterbatch has a thermal conductivity of 0.8±0.05W / m·K, which facilitates the production and processing of PET foamed composite core material for wind turbine blades.

[0038] Reference Figure 1 To improve the bonding stability between the prepreg tape and the PET foam substrate in the PET foam composite core material for wind turbine blades, a bonding layer 20 is formed on the surface of the PET film outer layer 2 in the prepreg tape facing away from the toughened and reinforced PET foam core layer 1 after low-temperature plasma treatment. Specifically, the low-temperature plasma treatment parameters are as follows: power 1000W, gas pressure 0.25MPa, working gas is nitrogen, and treatment time is 3min.

[0039] The prepreg tape has dimensions of 1200mm in length, 1000mm in width, and a thickness of 0.10-2.4mm.

[0040] Preferably, the prepreg tape has dimensions of 1200mm in length, 1000mm in width, and 0.48-0.50mm in thickness.

[0041] Reference Figure 1 The toughened and reinforced PET foam core layer 1 contains a fiber skeleton 3, which consists of a 0° fiber reinforcement layer 31 and / or a 90° fiber reinforcement layer 31 and / or a plain weave fiber mesh 33. The 0° fiber reinforcement layer 31 is composed of several 0° fibers. The 90° fiber reinforcement layer 32 is composed of several 90° fibers. The plain weave fiber mesh 33 is woven from warp and weft threads, and its structure is a plain weave.

[0042] Reference Figure 2 When the fiber skeleton is a 0° fiber reinforcement layer 31, the 0° fiber reinforcement layer 31 is laid in the toughened and reinforced PET foam core layer 1 in a multi-layer intermittent laying or a single-layer laying. The laying method of the 0° fiber reinforcement layer 31 is selected according to the different requirements of the customer for the thickness of the prepreg tape. For high-thickness prepreg tapes, a multi-layer 0° fiber reinforcement layer 31 laying method is adopted. Among them, the 0° fibers in the 0° fiber reinforcement layer include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber distributed along the X-axis direction. Preferably, the 0° fibers are 50D-100D Kevlar long fibers.

[0043] Reference Figure 3 When the fiber skeleton is a 90° fiber reinforcement layer 32, the 90° fiber reinforcement layer 32 is laid in the toughened and reinforced PET foam core layer 1 in a multi-layer intermittent laying or a single-layer laying method. The laying method of the 90° fiber reinforcement layer is selected according to the different requirements of the customer for the thickness of the prepreg tape. For thicker prepreg tapes, a multi-layer 90° fiber reinforcement layer 32 laying method is adopted. Among them, the 90° fibers in the 90° fiber reinforcement layer 32 include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber distributed along the X-axis direction. Preferably, the 0° fiber is 50D-100D Kevlar long fiber.

[0044] Reference Figure 4When the fiber skeleton is a plain-woven fiber mesh 33, the mesh size of the plain-woven fiber mesh 33 includes any one of 1mm*1mm, 2mm*2mm, 3mm*3mm, 5mm*5mm, 10mm*10mm, 15mm*15mm, and 20mm*20mm. Preferably, the mesh size of the plain-woven fiber mesh 33 is 1mm*1mm. The plain-woven fiber mesh 33 is laid in the toughened and reinforced PET foam core layer 1 in a multi-layer intermittent laying or a single-layer laying method. The laying method of the plain-woven fiber mesh 33 is selected according to the different requirements of the customer for the thickness of the prepreg tape. For high-thickness prepreg tapes, a multi-layer plain-woven fiber mesh 33 laying method is adopted. The warp yarns of the plain-woven fiber mesh 33 include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber. The weft yarns of the plain-woven fiber mesh 33 include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber. Preferably, the warp yarns in the plain weave fiber mesh 33 consist of alternating layers of bast fiberglass filament yarns (such as styrofoam-alkali-free glass fiber) and 50D-100D Kevlar fibers, with a yarn spacing of 1mm. The weft yarns in the plain weave fiber mesh also consist of alternating layers of bast fiberglass filament yarns (such as styrofoam-alkali-free glass fiber) and 50D-100D Kevlar fibers, with a yarn spacing of 1mm.

[0045] Reference Figure 5 When the fiber skeleton is 0° fiber reinforcement layer 31 and 90° fiber reinforcement layer 32, specifically, the laying method of 0° fiber reinforcement layer 31 and 90° fiber reinforcement layer 32 in the toughened and reinforced PET foam core layer 1 is 0° fiber reinforcement layer 31 / 90° fiber reinforcement layer 32 / 0° fiber reinforcement layer 31.

[0046] Reference Figure 1 When the fiber skeleton is a 0° fiber reinforcement layer 31 and a plain weave fiber mesh 33, specifically, the 0° fiber reinforcement layer 31 and the plain weave fiber mesh 33 are laid in the toughened and reinforced PET foam core layer 1 in the following manner: 0° fiber reinforcement layer 31 / plain weave fiber mesh 33 / 0° fiber reinforcement layer 31.

[0047] Reference Figure 6 When the fiber skeleton is a 90° fiber reinforcement layer 32 and a plain weave fiber mesh 33, the laying method of the 90° fiber reinforcement layer 32 and the plain weave fiber mesh 33 in the toughened and reinforced PET foam core layer 1 is 90° fiber reinforcement layer 32 / plain weave fiber mesh 33 / 90° fiber reinforcement layer 32.

[0048] Reference Figure 7When the fiber skeleton consists of 0° fiber reinforcement layer 31, 90° fiber reinforcement layer 32, and plain weave fiber mesh 33, the laying method of 0° fiber reinforcement layer 31, 90° fiber reinforcement layer 32, and plain weave fiber mesh 33 in the toughened and reinforced PET foam core layer 1 can be 0° fiber reinforcement layer 31 / plain weave fiber mesh 33 / 90° fiber reinforcement layer 33.

[0049] Reference Figure 8 Alternatively, the 0° fiber reinforcement layer 31, 90° fiber reinforcement layer 32, and plain weave fiber mesh 33 can be laid in the toughened and reinforced PET foam core layer 1 in the following manner: 0° fiber reinforcement layer 31 / 90° fiber reinforcement layer 32 / plain weave fiber mesh 33 / 90° fiber reinforcement layer 32 / 0° fiber reinforcement layer 31.

[0050] The preparation method of the prepreg tape has been disclosed in the invention patent "A Preparation Method of PET Foamed Composite Core Material for Wind Turbine Blades". In order to facilitate reading and understanding of this technical solution, the inventor will explain the preparation method of the prepreg tape again. Specifically, the preparation method of the prepreg tape is as follows:

[0051] Step 1, Preparation of toughened and reinforced PET foam core layer 1:

[0052] S1.1 Preparation of the first TPEE toughened and reinforced PET masterbatch: Accurately metered TPEE resin LN5355HR, compatibilizer - W5F polyester compatibilizer, 1PET adhesion promoter 9041, antioxidant 1024, antioxidant 168, UV stabilizer - UV-531, lubricant - zinc stearate, mold release agent PETS PT100, filler (2000 mesh ultrafine calcium carbonate and zinc oxide whiskers in a mass ratio of 19:1), and PET resin YS-Y01 are mixed evenly and placed in a screw extruder for melt extrusion, fiber drawing, cooling, granulation, and drying to obtain the first TPEE toughened and reinforced PET masterbatch;

[0053] Preparation of the second type of TPEE toughened and reinforced PET masterbatch: Accurately metered TPEE resin LN5355HR, compatibilizer - W5F polyester compatibilizer, PET adhesion promoter 9041, antioxidant 1024, antioxidant 168, UV stabilizer - UV-531, lubricant - zinc stearate, release agent PETS PT100, thermally conductive filler (ultrafine spherical alumina and carbon nanotubes in a mass ratio of 19:1), reinforcing filler (2000-mesh ultrafine calcium carbonate and zinc oxide whiskers in a mass ratio of 19:1), and PET resin YS-Y01 are mixed evenly and placed in a screw extruder for melt extrusion, fiber drawing, cooling, granulation, and drying to obtain the second type of TPEE toughened and reinforced PET masterbatch.

[0054] S1.2, the first type of TPEE toughened and reinforced PET masterbatch or the second type of TPEE toughened and reinforced PET masterbatch is placed in a screw extruder for melt extrusion, casting, biaxial stretching, shaping, and cooling to obtain a toughened and reinforced PET core unit film. The film thickness of the obtained toughened and reinforced PET core film can be adjusted by adjusting the biaxial stretching parameters (transverse stretching coefficient and longitudinal stretching coefficient). After biaxial stretching treatment, the thickness of the toughened and reinforced PET core film can be adjusted to 50 / 80 / 100 / 120 / 200μm; the preferred thickness of the toughened and reinforced PET core film is 80μm.

[0055] S1.3, at least one toughened and reinforced PET core film / fiber skeleton 3 / toughened and reinforced PET core film / fiber skeleton 3 / toughened and reinforced PET core film / fiber skeleton 3 / toughened and reinforced PET core film is laid from the bottom of the mold groove to obtain a semi-finished toughened and reinforced PET core film. The hot press plate of the hot press is embedded in the mold groove for hot pressing composite treatment. The surface temperature of the hot press plate is 225℃, the hot pressing pressure is 80N, the hot pressing duration is 200s, and it is cooled to room temperature to obtain a finished toughened and reinforced PET core film with a thickness of 0.40-0.42mm, that is, the toughened and reinforced PET foam core layer 1 of the prepreg tape;

[0056] Step 2: Cover one surface of the finished toughened and reinforced PET core film with a PET film, and then cover the other surface of the finished toughened and reinforced PET core film with another PET film to obtain a semi-finished prepreg tape. The thickness of the PET film can be selected as 50 / 80 / 100 / 120 / 200μm. Preferably, the thickness of the first PET film is 80μm, the thickness of the second PET film is 80μm, and the thickness of the finished toughened and reinforced PET core film is 0.40-0.42mm. The semi-finished prepreg tape is placed in the mold groove of the molding die, and the hot press plate of the hot press is fitted into the mold groove for hot pressing composite treatment. The surface temperature of the hot press plate is 245℃, the pressure applied by the hot press plate is 120N, the hot pressing duration is 120s, and after cooling to room temperature, the finished prepreg tape with a thickness of 0.48-0.5mm is obtained by trimming the edges.

[0057] Reference Figure 9 A prepreg roll material prepared from the aforementioned prepreg tape includes a first release paper 4, a second release paper 5, and a plurality of prepreg tapes spaced apart from each other, with the prepreg tapes laminated between the first release paper 4 and the second release paper 5. The adhesive strength between the prepreg tape and the first release paper 4 is less than the adhesive strength between the second release paper 5 and the first release paper 4.

[0058] Reference Figure 10 Custom requirements for the first release paper 4: The surface of the first release paper 4 in contact with the prepreg tape has a non-silicone oil covered area A41, and the bonding strength between the non-silicone oil covered area A41 of the first release paper 4 and the prepreg tape is greater than the bonding strength between the silicone oil covered area A42 of the first release paper and the prepreg tape.

[0059] Reference Figure 10 Custom requirements for the second release paper 5: The surface of the second release paper 5 in contact with the prepreg tape also has a non-silicone oil covered area B51, and the bonding strength between the non-silicone oil covered area B51 of the second release paper 5 and the prepreg tape is greater than the bonding strength between the silicone oil covered area B52 of the second release paper 5 and the prepreg tape.

[0060] Reference Figure 9 and Figure 10 The area of ​​the non-silicone oil covered area A41 of the first release paper 4 is smaller than the area of ​​the non-silicone oil covered area B51 of the second release paper 5. Preferably, the area of ​​the non-silicone oil covered area B51 of the second release paper 5 is twice the area of ​​the non-silicone oil covered area A41 of the first release paper 4. This ensures that the adhesion strength between the prepreg tape and the first release paper 4 is less than the adhesion strength between the second release paper 5 and the prepreg tape. The first release paper 4 is easy to tear and separate, thereby ensuring continuous production operations in the dedicated mass production FPET Block production system.

[0061] The purpose of the above-mentioned prepreg roll structure design is to facilitate the peeling of the first release paper 4 after the prepreg roll is hot-pressed by the dedicated mass production FPET Block system. During the peeling process of the first release paper 4, the adhesion strength between the second release paper 5 and the prepreg roll is relatively large, so that the second release paper is not peeled off, thereby ensuring the continuous production operation of the dedicated mass production FPET Block system.

[0062] In the prepreg roll, the spacing between adjacent prepreg rolls is equal to the distance between two PET foam substrates transported on the conveyor belt assembly in the PET foam substrate hot-pressing system of the dedicated mass production FPET Block system (disclosed in the invention patent "A method for preparing PET foam composite core material for wind turbine blades"). The distance between the two PET foam substrates is 2.4m, the distance between adjacent prepreg rolls is 2.4m, and the transmission speed V1 of the PET foam substrate is the same as the transmission speed V2 of the prepreg roll. This ensures the mass production and continuous manufacturing of standard FPET Blocks, and the improved production efficiency can effectively reduce the production cost of wind turbine blades.

[0063] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prepreg tape, characterized in that: The product includes a toughened and reinforced PET foam core layer (1) and a PET film outer layer (2) composited on the upper and lower surfaces of the toughened and reinforced PET foam core layer (1). The surface of the PET film outer layer (2) facing away from the toughened and reinforced PET foam core layer (1) is treated with low-temperature plasma to form an adhesive layer (20). A fiber skeleton (3) is provided inside the toughened and reinforced PET foam core layer (1). The fiber skeleton is a 0° fiber reinforcement layer and / or a 90° fiber reinforcement layer and / or a plain woven fiber mesh. The 0° fiber reinforcement layer is composed of several 0° fibers. The 90° fiber reinforcement layer is composed of several 90° fibers.

2. The prepreg tape according to claim 1, characterized in that: The thickness of the outer PET film (2) is 25-200μm; the thickness of the toughened and reinforced PET foam core layer (1) is 50-2000μm; the toughened and reinforced PET foam core layer (1) is made from TPEE toughened and reinforced PET masterbatch by extrusion melting, casting, stretching and cooling; the prepreg tape has a length of 1200mm, a width of 1000mm and a thickness of 0.1-2.4mm.

3. The prepreg tape according to claim 1, characterized in that: When the fiber skeleton is a 0° fiber reinforcement layer, the 0° fiber reinforcement layer is laid in the toughened and reinforced PET foam core layer (1) in a multi-layer intermittent laying or a single-layer laying. The 0° fiber in the 0° fiber reinforcement layer includes at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber and ultra-high molecular weight polyethylene fiber distributed along the X-axis direction.

4. The prepreg tape according to claim 1, characterized in that: When the fiber skeleton is a 90° fiber reinforcement layer, the 90° fiber reinforcement layer is laid in the toughened and reinforced PET foam core layer (1) in a multi-layer intermittent laying or a single-layer laying. The 90° fibers in the 90° fiber reinforcement layer include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber distributed along the X-axis direction.

5. A prepreg tape according to claim 1, characterized in that: When the fiber skeleton is a plain woven fiber mesh, and the mesh size of the plain woven fiber mesh includes any one of 1mm*1mm, 2mm*2mm, 3mm*3mm, 5mm*5mm, 10mm*10mm, 15mm*15mm, and 20mm*20mm, the plain woven fiber mesh is laid in the toughened and reinforced PET foam core layer (1) in a multi-layer intermittent laying or a single-layer laying. The warp yarns of the plain woven fiber mesh include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber. The weft yarns of the plain woven fiber mesh include at least one of glass fiber, carbon fiber, basalt fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber.

6. A prepreg tape according to claim 1, characterized in that: When the fiber skeleton is a 0° fiber reinforcement layer and a 90° fiber reinforcement layer, the 0° fiber reinforcement layer and the 90° fiber reinforcement layer are laid in the toughened and reinforced PET foam core layer (1) in the manner of 0° fiber reinforcement layer / 90° fiber reinforcement layer / 0° fiber reinforcement layer.

7. A prepreg tape according to claim 1, characterized in that: When the fiber skeleton is a 0° fiber reinforcement layer and a plain weave fiber mesh, the 0° fiber reinforcement layer and the plain weave fiber mesh are laid in the toughened and reinforced PET foam core layer (1) in the following manner: 0° fiber reinforcement layer / plain weave fiber mesh / 0° fiber reinforcement layer.

8. A prepreg tape according to claim 1, characterized in that: When the fiber skeleton is a 90° fiber reinforcement layer and a plain weave fiber mesh, the 90° fiber reinforcement layer and the plain weave fiber mesh are laid in the toughened and reinforced PET foam core layer (1) in the following manner: 90° fiber reinforcement layer / plain weave fiber mesh / 90° fiber reinforcement layer.

9. A prepreg tape according to claim 1, characterized in that: When the fiber skeleton is a 0° fiber reinforcement layer, a 90° fiber reinforcement layer, and a plain woven fiber mesh, the 0° fiber reinforcement layer, the 90° fiber reinforcement layer, and the plain woven fiber mesh are laid in the toughened and reinforced PET foam core layer (1) in the following manner: 0° fiber reinforcement layer / plain woven fiber mesh / 90° fiber reinforcement layer; or the 0° fiber reinforcement layer, the 90° fiber reinforcement layer, and the plain woven fiber mesh are laid in the toughened and reinforced PET foam core layer (1) in the following manner: 0° fiber reinforcement layer / 90° fiber reinforcement layer / plain woven fiber mesh / 90° fiber reinforcement layer / 0° fiber reinforcement layer.

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