A continuous preparation device for conductive micro-nano material modified prepreg

Abstract

The present invention discloses a device for continuously preparing prepregs modified with conductive micro-nano materials, comprising a fiber bundle unfolding device, a fiber impregnation tank, a prepreg thickness adjustment roller group, a high-voltage DC power supply, and a prepreg winding device. An ultrasonic probe is provided in the fiber impregnation tank, primarily to achieve uniform dispersion of the conductive micro-nano materials in the resin glue solution; the high-voltage DC power supply is primarily used to construct a high-intensity uniform electric field, and utilizes an electric field orientation method to achieve directional manipulation of the conductive micro-nano materials. While increasing the output of conductive micro-nano materials / fiber-reinforced thermosetting resin-based prepregs, the present invention solves the problems of agglomeration and random dispersion of conductive micro-nano materials in the resin, and has a positive effect on improving the performance of composite materials.

Description

Technical Field

[0001] The invention belongs to the field of preparation of micro-nano modified composite materials, and in particular relates to a device for continuously preparing conductive micro-nano material modified prepreg. Background Art

[0002] Fiber-reinforced resin-based unidirectional composites exhibit excellent mechanical properties in the fiber direction. However, due to constraints imposed by the resin matrix and the fiber-resin interface properties, unidirectional composites suffer from low strength and weak impact damage resistance in the direction perpendicular to the fibers. This significantly reduces the design flexibility of composites and restricts their application in multifunctional engineering components. Modifying fiber-reinforced resin-based prepregs, the basic building blocks of unidirectional laminates, is key to optimizing and improving the overall performance of composites.

[0003] Chinese patent CN205631113U and patent CN106738447A both disclose continuous fiber reinforced resin-based prepreg preparation devices, but both devices are only used to improve the wetting effect between the fiber and the resin glue. In order to further improve the performance of fiber reinforced resin-based composite materials, the transformation of the composite system from a two-phase to a three-phase or even multi-phase composite system has become one of the important research directions in this field. Among them, conductive micro-nano materials such as carbon nanotubes, graphene, and graphite microsheets have excellent physical and chemical properties. After being compounded with polymers, they can greatly improve the mechanical properties, electrical and thermal conductivity, and stability of the materials. They are one of the most promising reinforcing phase materials for current advanced resin-based composite materials and have become a hot topic of research at home and abroad. However, there is currently no existing technology involving a continuous preparation device for modified prepregs of conductive micro-nano materials. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device for continuously preparing prepreg modified with conductive micro-nano materials.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A device for continuously preparing conductive micro-nano material modified prepreg comprises, in sequence along the forward direction of the fiber, a fiber bundle unfolding device, a first conveying and pressing roller group, a fiber impregnation glue tank, a prepreg thickness adjustment roller group, a heating device, a second conveying and pressing roller group, a cooling device, a traction roller and a prepreg winding device; a release paper traction roller is also provided below the second conveying and pressing roller group, and a release paper winding roller is provided to the lower right of the release paper traction roller; a conductive micro-nano material / resin glue solution and an impregnation glue tank roller group are provided in the fiber impregnation glue tank, and the impregnation glue tank roller group is at least partially immersed in the conductive micro-nano material / resin glue solution. The device is characterized in that it also includes an electric field device, which is located directly above the heating device and consists of a high-voltage DC power supply, a positive electrode plate, a negative electrode plate and a power switch, and the spacing between the positive electrode plate and the negative electrode plate is 2-10 cm; the impregnation glue tank roller group consists of 1-5 corrosion-resistant guide rollers.

[0007] The present invention relates to a device for continuously preparing conductive micro-nano material modified prepreg, which is characterized in that four ultrasonic probes are arranged in the fiber impregnation glue tank.

[0008] The present invention relates to a continuous preparation device for conductive micro-nano material modified prepreg, which is characterized in that the impregnation tank roller group consists of two horizontally placed corrosion-resistant guide rollers.

[0009] The present invention relates to a continuous preparation device for conductive micro-nano material modified prepreg, which is characterized in that the impregnation tank roller group consists of three corrosion-resistant guide rollers arranged in a herringbone shape.

[0010] The present invention relates to a continuous preparation device for conductive micro-nano material modified prepreg, which is characterized in that the impregnation groove roller group consists of five corrosion-resistant guide rollers arranged in an M shape.

[0011] The present invention relates to a device for continuously preparing conductive micro-nano material modified prepreg, which is characterized in that the guide rollers of the impregnation groove roller group are made of glass or ceramic.

[0012] The present invention relates to a continuous preparation device for conductive micro-nano material modified prepreg, which is characterized in that the prepreg thickness adjustment roller group consists of 1-5 groups of pressure rollers with adjustable spacing of 0.1-1.5 mm.

[0013] The present invention relates to a device for continuously preparing conductive micro-nano material modified prepreg, which is characterized in that the positive electrode plate and the negative electrode plate are made of metal materials with good electrical conductivity.

[0014] The present invention relates to a device for continuously preparing a conductive micro-nano material modified prepreg, which is characterized in that the material of the positive electrode plate and the negative electrode plate is metal aluminum or copper.

[0015] The present invention provides a continuous preparation device for conductive micro-nano material modified prepregs. An ultrasonic probe is provided in the fiber impregnation tank thereof. The conductive micro-nano material can be uniformly dispersed in the resin glue by adjusting the ultrasonic power and frequency, thereby solving the problem of agglomeration of the conductive micro-nano material in the prepreg and having a positive effect on improving the comprehensive performance of the composite material. The present invention is provided with a high-voltage DC power supply, and during the prepreg heating and precuring molding process, a high-intensity uniform electric field is constructed for the conductive micro-nano material. The electric field orientation method is used to achieve directional distribution of the conductive micro-nano material in the prepreg, thereby solving the problem of random dispersion of the conductive micro-nano material in the prepreg and having a positive effect on effectively improving the reinforcement efficiency of the conductive micro-nano material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the device for continuously preparing directional conductive micro-nano material / fiber-reinforced resin-based prepreg of the present invention;

[0017] Figure 2 for Figure 1 A local enlarged view of the uniform electric field part.

[0018] In the figure, 1-fiber bundle winding roller, 2-fiber bundle, 3-fiber conveying guide roller, 4-fiber bundle unfolding device, 5-first conveying pressure roller group, 6-impregnation glue tank roller group, 7-fiber impregnation glue tank, 8-ultrasonic probe, 9-prepreg thickness adjustment roller group, 10-high voltage DC power supply, 11-positive electrode plate, 12-negative electrode plate, 13-release paper traction roller, 14-release paper winding roller, 15-second conveying pressure roller group, 16-traction roller group, 17-prepreg winding device, 18-conductive micro-nano material / resin glue, 19-heating device, 20-cooling device. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the technical solution.

[0020] Example 1

[0021] like Figure 1 As shown, the continuous preparation device for oriented conductive micro-nano materials / fiber-reinforced resin-based prepregs of the present invention is a horizontally arranged structure, including a fiber bundle winding roller 1, a fiber conveying guide roller 3, a fiber bundle unfolding device 4, a first conveying pressure roller group 5, a fiber impregnation device, a prepreg thickness adjustment roller group 9, an electric field device, a heating device 19, a release paper traction roller 13, a release paper winding roller 14, a second conveying pressure roller group 15, a cooling device 20, a traction roller group 16 and a winding device 17.

[0022] The fiber impregnation device includes a fiber impregnation tank 7, an impregnation roller assembly 6, an ultrasonic probe 8, and a conductive micro-nano material / resin solution 18. The conductive micro-nano material / resin solution 18 is a mixture of carbon nanotubes with a diameter of 5-30 nm and a length of 20-150 μm and epoxy resin. The fiber impregnation tank 7 is a square tank with an open top, measuring 500 mm x 300 mm x 100 mm. The impregnation roller assembly 6, ultrasonic probe 8, and conductive micro-nano material / resin solution 18 are placed inside the fiber impregnation tank 7. The impregnation roller assembly 6 consists of two ceramic guide rollers positioned horizontally at equal heights with an axial spacing of 100 mm. Four ultrasonic probes 8 are located at the four corners of the bottom of the fiber impregnation tank 7, 100 mm from each adjacent inner wall. The impregnation roller assembly 6 is completely immersed in the conductive micro-nano material / resin solution 18.

[0023] The electric field device consists of a high-voltage DC power supply 10, a positive electrode plate 11, a negative electrode plate 12 and a power switch. The positive electrode plate 11 and the negative electrode plate 12 are 20 cm long, the same width as the prepreg, with a spacing of 2 cm, and are made of aluminum.

[0024] The prepreg thickness adjustment roller group 9, the second conveying roller group 15 and the pulling roller group 16 are all one group, consisting of two rollers placed one above the other with an adjustable spacing of 0.1-1.5 mm.

[0025] The heating device 19 is an infrared lamp located directly below the negative electrode plate 12. The size of the heating area is equal to that of the electrode plate, and the temperature of the heating area is controllable within the range of room temperature to 200°C.

[0026] The cooling device 20 is a ceiling fan, which is located above the fiber tow 2 between the second conveying roller group 15 and the pulling roller group 16 and 300 mm away from the upper surface of the fiber tow 2.

[0027] A uniform electric field is constructed by a high voltage DC power supply 10, a positive electrode plate 11 and a negative electrode plate 12. Figure 2 As shown, the fiber bundle 2 impregnated with the conductive micro-nano material / resin glue 18 is located in a uniform electric field between the positive electrode plate 11 and the negative electrode plate 12, and the electric field force is used to realize the orientation control of the conductive micro-nano material.

[0028] When preparing oriented carbon nanotube / glass fiber reinforced epoxy resin-based prepreg, first, set the ultrasonic frequency of the ultrasonic probe 8 to 40KHz and the power to 200W, the temperature of the heating device 9 to 80°C, and the speed of the cooling device 20 to 80rpm; then start the heating device 9 and the cooling device 20, and after the temperature of the heating device 9 reaches the predetermined value, pour the carbon nanotube / epoxy resin glue into the fiber impregnation tank 7, and then start the ultrasonic probe 8 and the power switch in turn, and apply a voltage of 600V to the electrode plate; the fiber bundle 2 is drawn out from the fiber bundle winding roller 1 at a speed of 2mm / s, passes through the fiber conveying guide roller 3 and enters the fiber bundle unfolding device 4. After the fiber bundle is unfolded and thinned, it passes through the first conveying pressure roller group 5 into the fiber impregnation tank 7, and passes through the impregnation tank roller group 6 in turn. After the fiber bundle is fully impregnated with the carbon nanotube / epoxy resin glue, it enters the prepreg thickness adjustment roller group 9. After the prepreg, adjusted to a thickness of 0.15 mm, is placed between the positive electrode plate 11 and the negative electrode plate 12, its carbon nanotubes are oriented under the action of the electric field, and the resin glue is pre-cured and formed. It then enters the second conveyor roller group 15. The release paper is drawn from the release paper roll 14, passes through the release paper traction roller 13, enters the second conveyor roller group 15, and is bonded to the prepreg. After being cooled by the cooling device 20, it enters the traction roller group 16 and is reeled up by the prepreg reeling device 17.

[0029] Example 2

[0030] The difference from Example 1 is that:

[0031] The dipping glue tank roller group 6 is composed of three glass guide rollers arranged in a herringbone shape, and the distance between adjacent guide rollers is 90 mm.

[0032] There are three prepreg thickness adjustment roller groups 9 .

[0033] The electric field device, the positive electrode plate 11 and the negative electrode plate 12 have a length of 150 cm, a width the same as the width of the prepreg, a spacing of 10 cm, and are made of copper.

[0034] Example 3

[0035] The difference from Example 1 is that:

[0036] The dipping glue tank roller group 6 consists of five glass guide rollers arranged in an M shape, and the distance between adjacent guide rollers is 80 mm.

[0037] There are five prepreg thickness adjustment roller groups 9 .

Claims

1. A continuous preparation device for conductive micro-nano material modified prepreg, comprising, in order along the fiber forward direction, a fiber tow unwinding device, a first conveying and pressing roller group, a fiber impregnation tank, a prepreg thickness adjustment roller group, a heating device, a second conveying and pressing roller group, a cooling device, a traction roller, and a prepreg winding device, wherein a release paper traction roller is further provided below the second conveying and pressing roller group, and a release paper winding roller is provided to the right below the release paper traction roller; a conductive micro-nano material / resin glue solution and an impregnation tank roller group are provided in the fiber impregnation tank, and the impregnation tank roller group is at least partially immersed in the conductive micro-nano material / resin glue solution, characterized in that: The device also includes an electric field device, which is located directly above the heating device (19) and consists of a high-voltage DC power supply (10), a positive electrode plate (11), a negative electrode plate (12) and a power switch, wherein the spacing between the positive electrode plate (11) and the negative electrode plate (12) is 2-10 cm; and the dipping glue tank roller group (6) consists of 1-5 corrosion-resistant guide rollers.

2. The device for continuously preparing conductive micro-nano material modified prepreg according to claim 1, characterized in that: Four ultrasonic probes (8) are provided in the fiber impregnation glue tank (7).

3. The continuous preparation device for conductive micro-nano material modified prepreg according to claim 1, characterized in that: The dipping rubber tank roller group (6) consists of two horizontally placed corrosion-resistant guide rollers.

4. The device for continuously preparing conductive micro-nano material modified prepreg according to claim 1, characterized in that: The dipping rubber groove roller group (6) is composed of three corrosion-resistant guide rollers arranged in a herringbone shape.

5. The device for continuously preparing conductive micro-nano material modified prepreg according to claim 1, characterized in that: The dipping rubber groove roller group (6) consists of five corrosion-resistant guide rollers arranged in an M shape.

6. The device for continuously preparing conductive micro-nano material modified prepreg according to any one of claims 1 to 5, characterized in that: The guide rollers of the dipping glue tank roller group (6) are made of glass or ceramic.

7. The device for continuously preparing conductive micro-nano material modified prepreg according to claim 1, characterized in that: The prepreg thickness adjustment roller group (9) is composed of 1 to 5 groups of pressure rollers with adjustable spacing of 0.1 to 1.5 mm.

8. The device for continuously preparing conductive micro-nano material modified prepreg according to claim 1, characterized in that: The positive electrode plate (11) and the negative electrode plate (12) are made of a metal material with good electrical conductivity.

9. The device for continuously preparing conductive micro-nano material modified prepreg according to claim 5, characterized in that: The positive electrode plate (11) and the negative electrode plate (12) are made of metal aluminum or copper.

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