Fiber prepreg surface coating liquid coating device and use method thereof

Abstract

The present invention discloses a device for applying a liquid coating to a fiber prepreg surface, relating to the technical field of fiber composite materials. The device comprises a stoppered pear-shaped funnel, an impregnation device, and a flexible rubber roller. The flexible rubber roller is disposed at the rear end of the impregnation device. The impregnation device has a liquid inlet at its lower end, which is connected to a fiber impregnation groove disposed within the impregnation device. The lower end of the stoppered pear-shaped funnel is connected to the liquid inlet of the impregnation device via a U-shaped tube, wherein the U-shaped tube also has a flow control valve for adjusting the liquid flow rate. The device enables a volatile functional liquid to continuously flow upward from the bottom of the fiber impregnation groove and overflow, thereby resolving problems such as clogging, skinning, and coagulation during the coating process of a volatile functional material solution.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber composite materials, in particular to a fiber prepreg surface coating liquid coating device and a use method thereof. Background Art

[0002] Fiber prepregs are a combination of a resin matrix and a reinforcing material. Depending on the resin matrix, prepregs can be categorized as thermosetting and thermoplastic. At room temperature, thermosetting resins are highly viscous, resulting in a sticky surface and making them unsuitable for composite forming processes such as weaving, winding, fiber placement, and 3D printing. Furthermore, thermoplastic resins commonly used in thermoplastic prepregs, such as polypropylene, polyetheretherketone, and polyetherketoneketone, are relatively rigid at room temperature and have high heat deformation temperatures, making them difficult to use in these mechanized composite forming processes. To address this issue, patent applications CN201811392801.1, "A Method for Preparing Prepreg Fiber Bundles for Three-Dimensional Weaving," and CN202010688783.2, "A Method for Sizing Prepreg Fiber Bundles for Three-Dimensional Weaving Using Thermoplastic Resins," successfully prepared prepregs suitable for mechanized and automated composite forming by modifying the thermosetting resin matrix. In order to protect the surface of such fiber prepregs, a functional coating coating method is proposed that can both protect the yarn and play a role in interlayer toughening.

[0003] The fiber prepreg production process requires rapid drying of the functional coating, so the functional coating can only be completed by using a solution prepared with a volatile low-boiling point solvent. However, during the spraying process, volatile solutions often cause problems such as pipe blockage and nozzle blockage due to the rapid evaporation of the solvent, which makes it difficult to proceed with production smoothly. If a volatile solution is used to impregnate the fiber prepreg, problems such as crusting on the surface of the solution tank and uneven coating of the functional coating will occur. If the fiber prepreg is coated with a solution by conveying a solution flow from the top of the fiber prepreg, the functional material will condense and gradually clog the pipeline due to solvent volatilization at the outlet of the conveying pipeline. Therefore, it is necessary to design and develop a volatile functional liquid coating device to solve the problem of coating a volatile functional material solution on the surface of the fiber prepreg, so as to obtain a continuous fiber prepreg that can be evenly coated and has a certain thickness of functional coating. Summary of the Invention

[0004] The object of the present invention is to provide a fiber prepreg surface coating liquid coating device and a use method thereof to solve the problems raised in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A fiber prepreg surface coating liquid coating device includes a stoppered pear-shaped funnel, an impregnation device and a flexible rubber roller. The flexible rubber roller is arranged at the rear end of the impregnation device. A liquid inlet is provided at the lower end of the impregnation device, and the liquid inlet is connected to a fiber impregnation groove arranged inside the impregnation device. The lower end of the stoppered pear-shaped funnel is connected to the liquid inlet of the impregnation device through a U-shaped tube, wherein the U-shaped tube is also equipped with a flow control valve for adjusting the liquid flow rate.

[0007] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In an optional solution: a gap communicating with the outside air is provided on the top side of the pear-shaped funnel with a stopper, and a speed-adjustable opening glass stopper device is installed at the gap.

[0009] A method for using the above-mentioned fiber prepreg surface coating liquid coating device comprises the following steps:

[0010] Step 1: The fiber prepreg is passed through the guide rail into the impregnation device and the flexible rubber roller, the volatile functional liquid is placed in the pear-shaped funnel with a stopper, and the speed-adjustable opening glass stopper device is closed;

[0011] Step 2: Control the prepreg movement speed as required, and adjust the liquid flow rate through the adjustable speed opening glass plug device and the flow control valve, so that the functional liquid flows into the fiber impregnation groove at a reasonable flow rate to coat the fiber prepreg surface;

[0012] Step 3: The fiber prepreg coated with the functional coating enters the flexible rubber roller to remove excess functional liquid;

[0013] Step 4: drying the volatile solvent contained in the fiber prepreg functional coating, and obtaining the functional coating on the surface of the fiber prepreg after cooling;

[0014] Step 5: Roll up.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The embodiment of the present invention uses a pear-shaped funnel with a stopper to prevent the volatile functional material solution from volatilizing and clogging the container and pipeline, and can adjust the liquid flow rate; a U-shaped tube is used to transport the functional liquid to the fiber impregnation groove to gush out from the bottom to the top, and excess liquid continuously flows out from both ends of the upper surface of the fiber impregnation groove, forming a stably flowing functional liquid thin layer in the fiber impregnation groove, and a functional coating is obtained when the fiber prepreg passes through the functional liquid thin layer; the device can make the volatile functional liquid continuously flow from the bottom to the top and overflow in the fiber impregnation groove, which can solve the problems of easy clogging, easy skinning, and easy coagulation during the coating process of the volatile functional material solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the fiber impregnation device of the present invention.

[0018] Notes on the accompanying drawings: pear-shaped funnel with stopper 1, glass stopper device with adjustable speed opening 101, flow control valve 2, U-shaped tube 3, impregnation device 4, liquid inlet 401, fiber impregnation groove 402, flexible rubber roller 5. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. In the drawings or descriptions, similar or identical parts are denoted by the same reference numerals, and in actual applications, the shape, thickness, or height of each component may be enlarged or reduced. The various embodiments listed in the present invention are merely illustrative of the present invention and are not intended to limit the scope of the present invention. Any obvious modifications or changes made to the present invention do not depart from the spirit and scope of the present invention.

[0020] In one embodiment, Figure 1 As shown, a fiber prepreg surface coating liquid coating device includes a stoppered pear-shaped funnel 1, an impregnation device 4, and a flexible rubber roller 5. The flexible rubber roller 5 is disposed on one side of the impregnation device 4. The impregnation device 4 has a liquid inlet 401, and the liquid inlet 401 is connected to a fiber impregnation groove 402 disposed inside the impregnation device 4. One end of the stoppered pear-shaped funnel 1 is connected to the liquid inlet 401 via a U-shaped tube 3. The U-shaped tube 3 also has a flow control valve 2 for adjusting the liquid flow rate.

[0021] In an embodiment of the present invention, a volatile functional material solution is contained in a stoppered pear-shaped funnel 1. The material solution gradually flows toward a liquid inlet 401 through a U-shaped tube 3 and then into a fiber impregnation groove 402. The liquid flow rate is regulated by a flow control valve 2. The fiber prepreg passes between an impregnation device 4 and a flexible rubber roller 5. The impregnation device 4 and the flexible rubber roller 5 cooperate to apply a functional coating to the surface of the fiber prepreg. The liquid flow rate is regulated by a flow control valve 2 to achieve thickness control and uniformity. After rapid drying in an oven, the fiber prepreg coated with the functional coating is obtained.

[0022] In one embodiment, Figure 1 As shown, the top side of the stoppered pear-shaped funnel 1 is provided with a gap connected to the outside air and an adjustable speed opening glass stopper device 101 is installed at the gap; in an embodiment of the present invention, the use of the stoppered pear-shaped funnel 1 can prevent the volatile functional material solution from volatilizing and clogging the container and pipeline; the use of the adjustable speed opening glass stopper device 101 can adjust the liquid flow rate.

[0023] A method for using the above-mentioned fiber prepreg surface coating liquid coating device comprises the following steps:

[0024] Step 1: The fiber prepreg is passed through the guide rail into the impregnation device and the flexible rubber roller, the volatile functional liquid is placed in the pear-shaped funnel with a stopper, and the speed-adjustable opening glass stopper device is closed;

[0025] Step 2: Control the prepreg movement speed as required, and adjust the liquid flow rate through the adjustable speed opening glass plug device and the flow control valve, so that the functional liquid flows into the fiber impregnation groove at a reasonable flow rate to coat the fiber prepreg surface;

[0026] Step 3: The fiber prepreg coated with the functional coating enters the flexible rubber roller to remove excess functional liquid;

[0027] Step 4: drying the volatile solvent contained in the fiber prepreg functional coating, and obtaining the functional coating on the surface of the fiber prepreg after cooling;

[0028] Step 5: Roll up.

[0029] The embodiment of the present invention uses a stoppered pear-shaped funnel 1 to prevent the volatile functional material solution from volatilizing and clogging the container and pipeline, and can adjust the liquid flow rate; the U-shaped tube 3 is used to transport the functional liquid to the fiber impregnation groove 402 and gush out from the bottom to the top, and the excess liquid continuously flows out from both ends of the upper surface of the fiber impregnation groove 402, forming a stably flowing functional liquid thin layer in the fiber impregnation groove 402, and a functional coating is obtained when the fiber prepreg passes through the functional liquid thin layer; the device can make the volatile functional liquid continuously flow from the bottom to the top and overflow in the fiber impregnation groove 402, which can solve the problems of easy clogging, easy skinning, and easy coagulation during the coating process of the volatile functional material solution.

[0030] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A fiber prepreg surface coating liquid coating device, comprising a stoppered pear-shaped funnel, an impregnation device and a flexible rubber roller, characterized in that: The flexible rubber roller is arranged at the rear end of the impregnation device. The lower end of the impregnation device is provided with a liquid inlet and the liquid inlet is connected to the fiber impregnation groove provided inside the impregnation device. The lower end of the pear-shaped funnel with a stopper is connected to the liquid inlet of the impregnation device through a U-shaped tube, wherein the U-shaped tube is also provided with a flow control valve for adjusting the liquid flow rate. The top side of the pear-shaped funnel with a stopper is provided with a gap connected to the outside air, and a glass stopper device with an adjustable speed opening is installed at the gap; The use of a pear-shaped funnel with a stopper can prevent the volatile functional material solution from evaporating and clogging the container and pipeline, and can also adjust the liquid flow rate; a U-shaped tube is used to transport the functional liquid to the fiber impregnation groove to gush out from the bottom to the top, and excess liquid continuously flows out from both ends of the upper surface of the fiber impregnation groove, forming a stably flowing functional liquid thin layer in the fiber impregnation groove. When the fiber prepreg passes through the functional liquid thin layer, a functional coating is obtained; the device can make the volatile functional liquid continuously flow from the bottom to the top and overflow in the fiber impregnation groove, which can solve the problems of easy clogging, easy skinning, and easy coagulation during the coating process of the volatile functional material solution.

2. A method for using the fiber prepreg surface coating liquid coating device according to claim 1, characterized in that: The following steps are involved: Step 1: The fiber prepreg is passed through the impregnation device and the flexible rubber roller through the guide rail, the volatile functional liquid is placed in the pear-shaped funnel with a stopper, and the speed-adjustable opening glass stopper device is closed; Step 2: Control the prepreg movement speed as required, and adjust the liquid flow rate through the adjustable speed opening glass plug device and the flow control valve, so that the functional liquid flows into the fiber impregnation groove at a reasonable flow rate to apply the functional coating to the surface of the fiber prepreg; Step 3: The fiber prepreg coated with the functional coating enters the flexible rubber roller to remove excess functional liquid; Step 4: drying the volatile solvent contained in the fiber prepreg functional coating, and obtaining the functional coating on the surface of the fiber prepreg after cooling; Step 5: Roll up.

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