Gum dipping equipment for preparing large-tow prepreg

Abstract

The utility model discloses gum dipping equipment for preparing large-tow prepreg in the technical field of composite material production, which comprises a gum dipping tank with a heating function, the bottom surface of the gum dipping tank is an inclined surface, a gum inlet hole is arranged on the gum dipping tank close to the high end of the inclined surface, and a gum outlet hole is arranged on the gum dipping tank close to the low end of the inclined surface. According to the large-tow carbon fiber impregnation device, the problem that existing large-tow carbon fiber impregnation is not sufficient is solved, and the large-tow carbon fiber impregnation device can be used in large-tow prepreg preparation.

Description

Technical Field

[0001] The utility model relates to the technical field of composite material production, in particular to a prepreg dipping device. Background Art

[0002] Small tow (low K number) carbon fiber such as 3K, 6K, 12K has been the preferred reinforcement material for aviation, aerospace, and defense industries for many years. The raw yarn of large tow carbon fiber (48K and above) belongs to the civilian category, and its purchase is not restricted by the blockade. The price is only 40%~60% of that of small tow carbon fiber, but it has been limited by its lower mechanical properties and can only be used in large quantities in the civilian field. my country began to develop carbon fiber with the main purpose of developing aviation, and production is still dominated by small tow carbon fiber. With the significant progress made in large tow carbon fiber technology, its tensile strength has exceeded 3600MPa. my country is catching up with the international advanced level and exploring the potential of large tow carbon fiber and large tow carbon fiber prepreg in the military field.

[0003] The preparation method of thermosetting prepreg is mainly the hot melt method, which is to melt the resin at high temperature, directly dip the fiber through the dipping tank containing the molten resin, and then dry and roll it up; the prepreg prepared by the hot melt method has high control accuracy of resin content, low volatile matter, and good appearance. Especially the two-step method, it also has the unique advantages of flexibility, high efficiency and small thickness deviation.

[0004] The tows of large-tow carbon fiber are relatively thick, and it is not easy to spread them evenly when making prepregs, which increases the thickness of the single layer. On the one hand, it is difficult for the resin to penetrate the fiber bundles, and the impregnation is not sufficient, resulting in pores between single fibers. On the other hand, it is easy for the resin to be enriched inside the fibers. Ultimately, it affects the performance of the composite material and restricts the higher-end application of large-tow carbon fiber prepregs. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a dipping device for preparing large-tow prepreg, which solves the problem of insufficient dipping of existing large-tow carbon fibers.

[0006] The purpose of the utility model is achieved as follows: a glue dipping device for preparing large-tow prepreg, comprising a glue dipping tank with a self-heating function, the bottom surface of the glue dipping tank is an inclined surface, a glue inlet hole is provided on the glue dipping tank near the high end of the inclined surface, and a glue outlet hole is provided on the glue dipping tank near the low end of the inclined surface, the glue inlet hole is connected to a glue storage tank through a glue inlet pipe and a delivery pump, and the glue outlet hole is connected to the glue storage tank through a glue outlet pipe.

[0007] Furthermore, the interior of the glue dipping tank is a cavity structure, a heating element is arranged in the cavity structure and the cavity structure is filled with water, and a water inlet communicating with the cavity structure is opened on the side of the glue dipping tank.

[0008] Furthermore, a support assembly is provided at the bottom of the dipping tank, and the support assembly is a plurality of screw support feet.

[0009] Furthermore, the inner circumference of the dipping tank is a sloped structure.

[0010] Furthermore, the rubber inlet pipe and the rubber outlet pipe are both soft pipes.

[0011] Furthermore, the glue inlet pipe is connected to the lower part of the side of the glue storage tank, and the glue outlet pipe is connected to the top of the glue storage tank.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the equipment of the utility model realizes the lateral flow of molten resin in the impregnation tank, and utilizes the shear force brought by the resin flow to help disperse the fiber bundles, which is beneficial for the molten resin to fully penetrate the inside of the fiber bundles and reduce resin enrichment; utilizes the thixotropic characteristics of the resin fluid to reduce the consistency of the molten resin during the impregnation process, which is beneficial for resin dispersion and resin impregnation of the fibers, and in disguise reduces the requirements for temperature control in the impregnation process; thereby solving the problems of uneven fiber dispersion, resin infiltration and resin enrichment in the preparation process of large-tow carbon fiber prepregs, improving the appearance smoothness of the prepregs, reducing the defect rate of molded composite products, and improving the stability and uniformity of mechanical properties related to the interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the structure of the utility model.

[0015] Figure 2 It is a side view of the utility model.

[0016] Among them, 100 is a glue dipping tank, 101 is a glue inlet hole, 102 is a glue outlet hole, 103 is a cavity structure, 104 is a heating element, 105 is a water outlet, 106 is a bottom surface, 200 is a glue inlet hose, 300 is a delivery pump, 400 is a glue outlet hose, 500 is a glue storage tank, and 600 is a screw support foot. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1-2 The glue dipping equipment shown in the figure for preparing large-tow prepreg includes a glue dipping tank 100 with a built-in heating function. The bottom surface 106 of the glue dipping tank 100 is an inclined surface. A glue inlet hole 101 is provided on the glue dipping tank 100 near the high end of the inclined surface, and a glue outlet hole 102 is provided on the glue dipping tank 100 near the low end of the inclined surface. The glue inlet hole 101 is connected to a glue storage tank 500 through a glue inlet pipe 200 and a delivery pump 300, and the glue outlet hole 102 is connected to the glue storage tank 500 through a glue outlet pipe 400.

[0019] Specifically, the glue dipping tank 100 is a square structure, and the glue inlet hole 101 and the glue outlet hole 102 are respectively arranged on both sides of the glue dipping tank 100, and the opening position in the tank is located close to the bottom surface 106. The glue storage tank 500 can be installed on the supporting platform as needed, and at least two glue inlet holes 101 and glue outlet holes 102 are arranged.

[0020] During operation, the delivery pump 300 is turned on, and the delivery pump 300 draws the glue liquid from the glue storage tank 500 through the glue inlet pipe 200 and the glue inlet hole 101 into the glue dipping tank 100. The glue liquid flows in the glue dipping tank 100 and enters the glue storage tank 500 from the glue outlet hole 102 through the glue outlet pipe 400, thus completing the circulation of the glue liquid. The heating function of the glue dipping tank 100 can maintain the fluidity of the glue liquid in the glue dipping tank 100.

[0021] Furthermore, the interior of the dipping tank 100 is a cavity structure 103 , in which a heating element 104 is provided and filled with water, and a water inlet 105 communicating with the cavity structure 103 is opened on the side of the dipping tank 100 .

[0022] Specifically, the heating element 104 is an electric heater, and the inlet and outlet water share a water inlet 105 .

[0023] It should be noted that the water bath effect is achieved through this structure to heat the glue liquid in the glue dipping tank 100.

[0024] Furthermore, a support assembly is provided at the bottom of the dipping tank 100 , and the support assembly is a plurality of screw support feet 600 .

[0025] Specifically, four screw support legs 600 are provided.

[0026] It should be noted that the dipping tank 100 is supported by four screw support legs 600 and the horizontal / inclination is adjusted.

[0027] Furthermore, the inner circumference of the dipping tank 100 is a slope structure.

[0028] Furthermore, both the rubber inlet pipe 200 and the rubber outlet pipe 400 are soft pipes.

[0029] It should be noted that the design of the hose facilitates the connection of pipelines.

[0030] Furthermore, the glue inlet pipe 200 is connected to the lower side of the glue storage tank 500 , and the glue outlet pipe 400 is connected to the top of the glue storage tank 500 .

[0031] It should be noted that such a design makes the entry and exit of glue smoother.

[0032] In the prior art, large-tow carbon fibers are not easy to be evenly unfolded. In order to improve production efficiency and avoid carbon fiber bending, the traction tension of the carbon fibers is usually set high, which aggravates this problem. Large-tow carbon fiber prepregs are prone to resin infiltration and resin enrichment problems, which will lead to many internal defects in the composite materials after molding and limit their application.

[0033] The utility model solves the problem by utilizing the lateral flow of molten resin in the dipping tank 100 (with the pulling direction of the fiber bundle as the longitudinal direction). There are two working principles: 1) utilizing the lateral shear force brought by the resin flow to help disperse the fiber bundle, which is conducive to the molten resin fully permeating the fiber bundle and reducing resin enrichment; 2) utilizing the thixotropic characteristics of the resin fluid to reduce the consistency of the molten resin during the dipping process, which is conducive to the dispersion of the resin and the resin infiltration of the fiber, thereby reducing the temperature control requirements of the dipping process in disguised form.

[0034] In order to achieve the lateral flow of molten resin in the dipping tank 100, the utility model uses a water bath to heat the resin, uses a screw support foot to adjust the horizontal / inclined degree of the internal dipping tank 100, uses a resin delivery pump 300 to control the resin flow rate, and combines the design of the inclined bottom plate of the internal dipping tank 100 to jointly achieve coarse and fine adjustment of the resin flow state.

[0035] The above embodiments are only used to help understand the method and core idea of ​​the utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A dipping device for preparing large-tow prepreg, characterized in that: The invention comprises a glue dipping tank (100) with a self-heating function, wherein the bottom surface (106) of the glue dipping tank (100) is an inclined surface, a glue inlet hole (101) is provided on the glue dipping tank (100) near the upper end of the inclined surface, and a glue outlet hole (102) is provided on the glue dipping tank (100) near the lower end of the inclined surface, the glue inlet hole (101) is connected to a glue storage tank (500) via a glue inlet pipe (200) in conjunction with a delivery pump (300), and the glue outlet hole (102) is connected to the glue storage tank (500) via a glue outlet pipe (400).

2. The dipping equipment for preparing large-tow prepreg according to claim 1, characterized in that: The interior of the dipping tank (100) is a cavity structure (103), a heating element (104) is arranged in the cavity structure (103) and the cavity structure (103) is filled with water, and a water inlet (105) communicating with the cavity structure (103) is provided on the side of the dipping tank (100).

3. A dipping device for preparing large-tow prepreg according to claim 1 or 2, characterized in that: A support component is provided at the bottom of the dipping tank (100), and the support component is a plurality of screw rod support feet (600).

4. A dipping device for preparing large-tow prepreg according to claim 1 or 2, characterized in that: The inner circumference of the dipping tank (100) is a sloped structure.

5. A dipping device for preparing large-tow prepreg according to claim 1 or 2, characterized in that: The rubber inlet pipe (200) and the rubber outlet pipe (400) are both soft pipes.

6. A dipping device for preparing large-tow prepreg according to claim 1 or 2, characterized in that: The glue inlet pipe (200) is connected to the lower part of the side of the glue storage tank (500), and the glue outlet pipe (400) is connected to the top of the glue storage tank (500).

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