Low-density braided fabric strengthening device based on node constraint and surface modification

Abstract

The utility model relates to the technical field of fiber reinforcement, in particular to a low-density braided fabric reinforcement device based on node constraint and surface modification. A low-density braided fabric strengthening device based on node constraint and surface modification comprises a fiber strengthening bin, a waste liquid bin and a vacuum pump. The fiber reinforcement bin is used for placing a fiber skeleton, the waste liquid bin is located at the bottom of the fiber reinforcement bin, the waste liquid bin is connected with the fiber reinforcement bin in an openable and closable mode, and the fiber reinforcement bin is connected with the vacuum pump and the outside through two pipelines. The two pipelines are respectively provided with a first valve and a second valve to realize opening and closing of the pipelines, the waste liquid bin is provided with a liquid pumping valve and a liquid discharging valve, the liquid pumping valve is used for realizing opening and closing connection between the waste liquid bin and the vacuum pump, and the liquid discharging valve is used for controlling opening and closing connection between the waste liquid bin and the outside. The embodiment of the utility model provides a low-density braided fabric strengthening device based on node constraint and surface modification, which can be used for preparing high-strength fiber composite materials.

Description

Technical Field

[0001] The utility model relates to the technical field of fiber reinforcement, in particular to a low-density braided fabric reinforcement device based on node constraint and surface modification. Background Art

[0002] Fibers and fiber products have been widely used in the field of composite materials. Due to their wide variety and various weaving methods, they can adapt to different application scenarios and scopes, resulting in inorganic fiber systems represented by carbon fiber, quartz fiber, mullite fiber, etc., as well as organic fibers represented by polyethylene, polyimide, etc. Selecting appropriate fibers as the reinforcing phase of composite materials can effectively improve the mechanical properties of composite materials, enable many high-performance materials to exert greater application potential and economic value, and also play an important role in aerospace, people's livelihood, medical and other fields.

[0003] In the prior art, since fibers and fiber products require the use of sizing agents as connections between fiber bundles in the preparation process in order to obtain better weaving performance, the fiber surface reactive sites are reduced due to the influence of the fiber sizing agent, and no effective connection is formed between the bundles, resulting in limited improvement in the mechanical properties of the composite material, while still retaining the original flexible fiber properties, which greatly reduces the fiber reinforcement effect.

[0004] Therefore, in view of the above-mentioned shortcomings, there is an urgent need for a low-density braid reinforcement device based on node constraint and surface modification, which can prepare high-strength fiber composite materials. Utility Model Content

[0005] The embodiment of the utility model provides a low-density braided fabric reinforcement device based on node constraints and surface modification, which can prepare high-strength fiber composite materials.

[0006] The embodiment of the utility model provides a low-density braid reinforcement device based on node constraint and surface modification, including a fiber reinforcement bin, a waste liquid bin and a vacuum pump;

[0007] The fiber reinforced bin is used for placing the fiber skeleton, the waste liquid bin is located at the bottom of the fiber reinforced bin, the waste liquid bin and the fiber reinforced bin can be connected in an openable and closable manner, the fiber reinforced bin is connected to the vacuum pump and the outside world through two pipes respectively, the two pipes are respectively equipped with a first valve and a second valve to realize the opening and closing of the pipes, the waste liquid bin is provided with a liquid extraction valve and a liquid discharge valve, the liquid extraction valve is used to realize the opening and closing connection between the waste liquid bin and the vacuum pump, and the liquid discharge valve is used to control the opening and closing connection between the waste liquid bin and the outside world.

[0008] In a possible design, the fiber-reinforced bin includes an upper cylindrical portion and a lower funnel portion, and the bottom of the funnel portion is connected to the waste liquid bin.

[0009] In a possible design, a porous plate is provided at the bottom of the cylindrical body, and the porous plate is used to support the fiber skeleton and allow the resin to pass through the porous plate along the holes.

[0010] In a possible design, an opening and closing plate is provided at the bottom of the porous plate, and the opening and closing plate can enter and exit the cylinder part along the slot reserved on the shell of the cylinder part to close or open the connection between the fiber reinforced bin and the waste liquid bin.

[0011] In a possible design, the fiber reinforcement bin is provided with a vacuum gauge to measure the vacuum degree in the fiber reinforcement bin.

[0012] In a possible design, the pipeline connecting the fiber reinforcement bin and the outside is provided with a third valve, and the waste liquid bin is provided with a circulation pipeline, and the circulation pipeline connects the pipeline section between the second valve and the third valve.

[0013] In a possible design, the circulation pipeline is provided with a one-way valve.

[0014] In a possible design, the fiber-reinforced bunker is provided with a glass window for observing the conditions inside.

[0015] Compared with the prior art, the utility model has at least the following beneficial effects:

[0016] When strengthening, open the first valve, close the connection between the waste liquid bin and the fiber strengthening bin, and close the liquid extraction valve. Turn on the vacuum pump to put the fiber strengthening bin and the fiber skeleton inside it in a vacuum environment, for example, it can be 1 to 20 kPa. The pipe connecting the fiber strengthening bin to the outside world is passed into the resin glue barrel, and the second valve is opened to allow the resin in the resin glue barrel to enter the fiber strengthening bin. After the fiber skeleton is completely immersed in the resin, close the second valve and stay for 10 to 30 minutes. Then close the first valve and the second valve, open the liquid extraction valve, open the connection between the fiber strengthening bin and the waste liquid bin, turn on the vacuum pump, allow the resin to fully impregnate the fiber skeleton, and extract the excess resin in the fiber strengthening bin into the waste liquid bin. The resin is an organic solvent, and the impregnation process can allow the resin to take away the sizing agent on the surface of the fiber skeleton. After removing the sizing agent, the resin that continues to be impregnated can also strengthen the fiber skeleton to obtain a fiber-reinforced composite material.

[0017] The utility model is used to strengthen the interface of low-density woven fabrics, which can greatly improve the bonding strength of the fiber skeleton, form a solidified resin shell at the fiber connection point, stabilize the three-dimensional structure of the fiber skeleton, and provide enhanced mechanical properties. In addition, the fiber surface can be uniformly chemically modified to provide a good interface with the subsequent further composite matrix. The filtration process is beneficial to control the concentration, impregnation amount and uniformity of the impregnation glue. Compared with the natural drying of the impregnation, the filtration process can only retain the resin glue on the fiber surface, avoiding the formation of local resin accumulation and unnecessary weight gain. The strength after filtration can be increased by 5% to 20%, and the density can be increased by 0.08-0.2g / cm 3 The strength of the composite material prepared by the on-demand regulation without the filtration process is not significantly improved, but the density is increased by 0.2-0.4g / cm 3 And uncontrollable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a low-density braided fabric reinforcement device based on node constraint and surface modification provided by an embodiment of the utility model;

[0020] Figure 2 It is a partial cross-sectional schematic diagram of a low-density braid reinforcement device based on node constraint and surface modification provided by an embodiment of the utility model.

[0021] In the figure:

[0022] 1-Fiber reinforced warehouse;

[0023] 11- first valve;

[0024] 12- second valve;

[0025] 13- the third valve;

[0026] 14- Vacuum gauge;

[0027] 2- Waste liquid tank;

[0028] 21-liquid extraction valve;

[0029] 22-drain valve;

[0030] 3- Vacuum pump;

[0031] 101- porous plate;

[0032] 102-Opening and closing plate. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the description of this specification, it is necessary to understand that the directional words such as "upper" and "lower" described in the embodiments of the utility model are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the utility model. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0036] like Figure 1 and Figure 2 As shown, the embodiment of the utility model provides a low-density braid reinforcement device based on node constraint and surface modification, including a fiber reinforcement bin 1, a waste liquid bin 2 and a vacuum pump 3;

[0037] The fiber reinforced bin 1 is used to place the fiber skeleton, the waste liquid bin 2 is located at the bottom of the fiber reinforced bin 1, the waste liquid bin 2 and the fiber reinforced bin 1 can be connected in an openable and closable manner, the fiber reinforced bin 1 is connected to the vacuum pump 3 and the outside world through two pipes respectively, the two pipes are respectively equipped with a first valve 11 and a second valve 12 to realize the opening and closing of the pipes, the waste liquid bin 2 is provided with a liquid extraction valve 21 and a liquid discharge valve 22, the liquid extraction valve 21 is used to realize the opening and closing connection between the waste liquid bin 2 and the vacuum pump 3, and the liquid discharge valve 22 is used to control the opening and closing connection between the waste liquid bin 2 and the outside world.

[0038] When strengthening, open the first valve 11, close the connection between the waste liquid bin 2 and the fiber reinforcement bin 1, and close the liquid extraction valve 21. Turn on the vacuum pump 3 to put the fiber reinforcement bin 1 and the fiber skeleton inside it in a vacuum environment, for example, it can be 1 to 20 kPa. The pipe connecting the fiber reinforcement bin 1 to the outside world is passed into the resin glue barrel, and the second valve 12 is opened to allow the resin in the resin glue barrel to enter the fiber reinforcement bin 1. After the fiber skeleton is completely immersed in the resin, close the second valve 12 and stay for 10 to 30 minutes. Then close the first valve 11 and the second valve 12, open the liquid extraction valve 21, open the connection between the fiber reinforcement bin 1 and the waste liquid bin 2, turn on the vacuum pump 3, allow the resin to fully impregnate the fiber skeleton, and pump the excess resin in the fiber reinforcement bin 1 into the waste liquid bin 2. The resin is an organic solvent, and the impregnation process can allow the resin to take away the sizing agent on the surface of the fiber skeleton. After removing the sizing agent, the resin that continues to be impregnated can also strengthen the fiber skeleton to obtain a fiber-reinforced composite material.

[0039] In one embodiment of the present invention, the fiber-reinforced bin includes an upper cylindrical portion and a lower funnel portion, and the bottom of the funnel portion is connected to the waste liquid bin 2 .

[0040] In the embodiment of the utility model, the barrel is used to place the fiber skeleton and is the place where the fiber skeleton is impregnated with resin. The funnel is used to collect the resin liquid passing through the fiber skeleton and guide it into the waste liquid bin 2.

[0041] In one embodiment of the present invention, a porous plate 101 is disposed at the bottom of the cylinder, and the porous plate 101 is used to support the fiber skeleton and allow the resin to pass through the porous plate 101 along the holes.

[0042] In one embodiment of the present invention, an opening and closing plate 102 is provided at the bottom of the porous plate 101. The opening and closing plate 102 can enter and exit the cylinder along the slot reserved on the cylinder shell to close or open the connection between the fiber reinforced bin 1 and the waste liquid bin 2.

[0043] In this embodiment, a seal can be provided at the edge of the opening and closing plate 102 so that it is sealed and connected to the inner wall of the barrel portion after being inserted into the slot. A seal can be provided at the edge of the slot so that the opening and closing plate 102 and the slot are sealed and connected.

[0044] In one embodiment of the present invention, the fiber reinforcement chamber 1 is provided with a vacuum gauge 14 to measure the vacuum degree in the fiber reinforcement chamber 1 .

[0045] In one embodiment of the utility model, the pipeline connecting the fiber reinforcement bin 1 with the outside is provided with a third valve 13 , and the waste liquid bin 2 is provided with a circulation pipeline connecting the pipeline portion between the second valve 12 and the third valve 13 .

[0046] In this embodiment, after the fiber reinforcement chamber 1 is evacuated, the second valve 12 can be opened, the third valve 13 can be closed, and the resin in the waste liquid chamber 2 can be reused to complete the impregnation.

[0047] In one embodiment of the present invention, the circulation pipeline is provided with a one-way valve.

[0048] In one embodiment of the present invention, the fiber reinforced bin 1 is provided with a glass window for observing the internal conditions thereof.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A low-density braid reinforcement device based on node constraints and surface modification, characterized in that: Includes fiber reinforcement chamber, waste liquid chamber and vacuum pump; The fiber reinforced bin is used for placing the fiber skeleton, the waste liquid bin is located at the bottom of the fiber reinforced bin, the waste liquid bin and the fiber reinforced bin can be connected in an openable and closable manner, the fiber reinforced bin is connected to the vacuum pump and the outside world through two pipes respectively, the two pipes are respectively equipped with a first valve and a second valve to realize the opening and closing of the pipes, the waste liquid bin is provided with a liquid extraction valve and a liquid discharge valve, the liquid extraction valve is used to realize the opening and closing connection between the waste liquid bin and the vacuum pump, and the liquid discharge valve is used to control the opening and closing connection between the waste liquid bin and the outside world.

2. The low-density braided fabric reinforcement device according to claim 1, characterized in that: The fiber-reinforced bin comprises an upper cylindrical portion and a lower funnel portion, and the bottom of the funnel portion is connected to the waste liquid bin.

3. The low-density braided fabric reinforcement device according to claim 2, characterized in that: A porous plate is arranged at the bottom of the cylinder, and the porous plate is used to support the fiber skeleton and allow resin to pass through the porous plate along the holes.

4. The low-density braided fabric reinforcement device according to claim 3, characterized in that: An opening and closing plate is arranged at the bottom of the porous plate, and the opening and closing plate can enter and exit the cylindrical body along the slot reserved on the shell of the cylindrical body to close or open the connection between the fiber reinforcement bin and the waste liquid bin.

5. The low-density braided fabric reinforcement device according to claim 1, characterized in that: The fiber reinforcement chamber is provided with a vacuum gauge to measure the vacuum degree in the fiber reinforcement chamber.

6. The low-density braided fabric reinforcement device according to claim 1, characterized in that: The pipeline connecting the fiber reinforcement bin and the outside is provided with a third valve, and the waste liquid bin is provided with a circulation pipeline, and the circulation pipeline connects the pipeline part between the second valve and the third valve.

7. The low-density braided fabric reinforcement device according to claim 6, characterized in that: The circulation pipeline is provided with a one-way valve.

8. The low-density braided fabric reinforcement device according to claim 1, characterized in that: The fiber reinforced warehouse is provided with a glass window for observing the internal conditions thereof.

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