A mold for preparing fiberglass reinforced plastic and a method for preparing fiberglass reinforced plastic

Abstract

The present invention relates to the technical field of molds and their use methods, and discloses a mold for preparing fiberglass and a method for preparing fiberglass; the mold includes an upper mold and a lower mold, a lower mold cavity is arranged in the lower mold, a glue injection seat is arranged in the middle of the upper mold, the glue injection seat is communicated with a plurality of glue injection grooves respectively arranged on the upper surface of the upper mold, the plurality of glue injection grooves are respectively communicated with the lower mold cavity, and the plurality of glue injection grooves extend radially towards the edge of the upper mold, and a plurality of air extraction holes communicated with the lower mold cavity are arranged at the edge of the upper mold; by arranging the glue injection seat and the glue injection grooves, the resin can be quickly and evenly infiltrated into the fiberglass cloth, and the use is convenient. The preparation method includes laying fiberglass cloth, prefabricated parts, a diversion net and a demolding cloth, closing the mold, evacuating, injecting resin, and curing; it can realize the smooth demolding of fiberglass and rapid molding in a short time.

Description

Technical Field

[0001] The present invention relates to the technical field of molds and their usage methods, and particularly to a mold for preparing fiberglass reinforced plastics and a method for preparing fiberglass reinforced plastics. Background Art

[0002] Tunnel composite doors generally consist of fiberglass reinforced plastics, steel plates, perlite layers, steel plates, and fiberglass reinforced plastics. Both the fiberglass reinforced plastics and the steel plates are used to enhance the structural rigidity of the tunnel protection door, and the perlite layer is used to improve the fire and heat insulation capabilities of the tunnel protection door to achieve the fire safety level.

[0003] The existing methods for preparing fiberglass reinforced plastics are generally vacuum infusion processes. That is, by placing a fiberglass cloth in the mold cavity of the lower mold, the upper mold and the lower mold are pressed together, and the mold cavity is gradually evacuated by a vacuum device. Then, resin is gradually injected into the mold cavity, and under the action of vacuum, the resin fully infiltrates onto the fiberglass cloth. Then, the injection of resin is stopped, and after it cures, fiberglass reinforced plastics are obtained. The above methods require the cooperation of the upper mold and the lower mold to proceed. For example, a Chinese patent with the publication number CN 112078154 A discloses a mold for producing fiberglass partitions, including an upper mold and a lower mold. At least on the top surface of the lower mold, there is a lower mold cavity, and a circle of inner sealing rings is provided along the edge of the lower mold cavity. The bottom surface of the upper mold and the top surface of the lower mold are hermetically matched through the inner sealing rings; on one half of the upper mold located above the lower mold cavity, there are several air extraction holes, and on the other half, there are several glue injection holes. During use, the air on one side of the lower mold cavity is evacuated through the air extraction holes, so that the resin gradually injects into the lower mold cavity from the glue injection holes on the other side of the lower mold cavity. However, the above structure requires connecting multiple air extraction holes to a vacuum device respectively, and multiple glue injection holes to a glue injection device respectively to ensure that the injected resin can uniformly infiltrate the fiberglass cloth, which is relatively complex to use and the manufacturing process takes a long time.

[0004] It can be seen that the existing technology still needs to be improved. Summary of the Invention

[0005] In view of the deficiencies of the above-mentioned existing technology, the purpose of the present invention is to provide a mold for preparing fiberglass reinforced plastics and a method for preparing fiberglass reinforced plastics, aiming to solve the problem of the complex use of existing molds for fiberglass production.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A fiberglass preparation mold, comprising an upper mold and a lower mold. A lower mold cavity is arranged inside the lower mold, and the upper mold is pressed against the lower mold. A glue injection seat is arranged in the middle of the upper mold. The glue injection seat is communicated with a plurality of glue injection grooves respectively arranged on the upper surface of the upper mold. The plurality of glue injection grooves are respectively communicated with the lower mold cavity, and the plurality of glue injection grooves extend radially towards the edge of the upper mold. A plurality of air extraction holes communicated with the lower mold cavity are arranged at the edge of the upper mold.

[0008] In the fiberglass preparation mold, a plurality of the glue injection grooves are in a "rice" shape; four air extraction holes are arranged, and the four air extraction holes are respectively arranged at four corner positions of the upper mold.

[0009] In the fiberglass preparation mold, the cross-section of the lower mold is concave, the cross-section of the upper mold is T-shaped, the edge of the upper mold is connected with an elastic sealing strip, and the lower end surface of the sealing strip abuts against the upper surface of the edge of the lower mold.

[0010] In the fiberglass preparation mold, the edge of the upper mold is bent downwards to form a bent edge. Two clamping strips extending upwards are arranged on the upper part of the sealing strip. The ends of the two clamping strips gradually approach each other, and an abutting groove is formed between the two clamping strips. The bent edge is inserted into the abutting groove, and the inner sides of the ends of the two clamping strips respectively abut against the two side walls of the bent edge.

[0011] In the fiberglass preparation mold, an encryption strip is arranged on the inner side edge of the inner clamping strip. The encryption strip is inclined downwards, and its end abuts against the inner side wall of the bent edge.

[0012] In the fiberglass preparation mold, a hollow groove is arranged inside the sealing strip. Two extrusion strips symmetrically arranged along the central axis of the sealing strip are arranged on both sides of the lower end surface of the sealing strip. The two extrusion strips respectively abut against the upper surface of the edge of the lower mold.

[0013] In the fiberglass preparation mold, a pre-buried sealing box communicated with the lower mold cavity is arranged on the upper surface of the upper mold.

[0014] In the fiberglass preparation mold, a plurality of reinforcing ribs are arranged on the upper surface of the upper mold. The reinforcing ribs are of a hollow structure, and avoidance holes for avoiding the glue injection grooves are arranged on the reinforcing ribs.

[0015] A method for preparing fiberglass, comprising the following steps:

[0016] Separate the upper mold and the lower mold, and apply release wax to the inner wall of the lower mold cavity; lay multiple layers of fiberglass cloth in the lower mold cavity, insert the preform, and lay a flow guide net and a release cloth on the fiberglass cloth;

[0017] Press the upper mold into the lower mold cavity, connect the vacuum device to the air extraction hole through an air pipe, and start the vacuum device to evacuate the lower mold cavity;

[0018] Connect the glue injection container to the glue injection seat through a pipeline, open the valve on the pipeline, and inject the resin in the glue injection container into the lower mold cavity through the glue injection seat and the glue injection groove;

[0019] Close the valve on the pipeline, maintain the vacuum degree of the lower mold cavity, demold after the resin is cured, and prepare fiberglass.

[0020] The method for preparing fiberglass, wherein the resin includes a modified acrylic resin, a curing agent, and an accelerator, and the resin cures at room temperature.

[0021] Beneficial effects:

[0022] The present invention provides a fiberglass preparation mold. By providing a lower mold cavity for placing raw materials such as fiberglass cloth, a flow guide net, and a release cloth, an upper mold for pressing with the lower mold cavity, a glue injection seat for connecting with a glue injection container, a radially arranged glue injection groove for guiding the resin to quickly and evenly infiltrate into the fiberglass cloth, and an air extraction hole for connecting with a vacuum device, when the lower mold cavity is gradually evacuated, the resin can be evenly covered on the entire width of the fiberglass cloth and quickly infiltrated into its interior. Without setting multiple glue injection holes and air extraction holes, the resin can be quickly and evenly infiltrated into the fiberglass cloth, which is convenient to use.

[0023] The present invention also provides a method for preparing fiberglass. By coating release wax in the lower mold cavity, laying fiberglass cloth, inserting a preform, laying a flow guide net and a release cloth, closing the mold, evacuating the lower mold cavity with a vacuum device, injecting resin, and curing at room temperature; the fiberglass finished product and the preform are integrally formed and smoothly demolded, and can be quickly formed in a short time, which is beneficial to improving production efficiency. Description of the drawings

[0024] Figure 1 It is a schematic structural diagram of the fiberglass preparation mold provided by the present invention.

[0025] Figure 2 It is an exploded view of the fiberglass preparation mold and the fiberglass finished product.

[0026] Figure 3 It is a partial cross-sectional view of the fiberglass preparation mold and the fiberglass product.

[0027] Figure 4 For Figure 3Enlarged view of part A.

[0028] Figure 5 is Figure 4 Enlarged view of part B.

[0029] Figure 6 It is a schematic structural diagram of the upper mold.

[0030] Description of main component symbols: 1 - upper mold, 11 - bending edge, 12 - reinforcing rib, 13 - avoidance hole, 2 - lower mold, 21 - lower mold cavity, 3 - sealing strip, 31 - clamping strip, 32 - abutting groove, 33 - encryption strip, 34 - hollow groove, 35 - extrusion strip, 4 - glue injection seat, 5 - glue injection groove, 6 - air extraction hole, 7 - embedded sealing box, 100 - finished fiberglass product, 101 - prefabricated part. Specific implementation mode

[0031] The present invention provides a fiberglass preparation mold and a method for preparing fiberglass. To make the purpose, technical solution and effect of the present invention clearer and more definite, the following further elaborates the present invention with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the protection scope of the present invention.

[0032] Please refer to Figures 1 - 3 , the present invention provides a fiberglass preparation mold, including an upper mold 1 and a lower mold 2. A lower mold cavity 21 is arranged in the lower mold 2, and the upper mold 1 is pressed against the lower mold 2; a glue injection seat 4 is arranged in the middle of the upper mold 1, and the glue injection seat 4 is communicated with a plurality of glue injection grooves 5 respectively arranged on the upper surface of the upper mold 1. The plurality of glue injection grooves 5 are respectively communicated with the lower mold cavity 21, and the plurality of glue injection grooves 5 extend radially towards the edge of the upper mold 1. A plurality of air extraction holes 6 communicated with the lower mold cavity 21 are arranged at the edge of the upper mold 1.

[0033] In actual use, the upper mold 1 and the lower mold 2 are separated to ensure that there is no debris in the lower mold cavity 21 of the lower mold 2 and the inner wall is smooth. Then, release wax is applied to the inner wall to facilitate the smooth demolding of the fiberglass product 100 from the lower mold 2. The number of layers of fiberglass cloth to be laid is set according to the thickness of the fiberglass product 100. In this embodiment, the number of laid layers is 32, and the thickness of the manufactured fiberglass is 10 mm. It should be noted here that the number of layers of fiberglass cloth laid and the thickness of the finished product are only for illustrating this solution and are not limited. After laying, a flow guide net and a release cloth are laid thereon. Multiple flow guide holes are provided on the flow guide net to facilitate the subsequent injected resin to penetrate into the fiberglass cloth through the flow guide holes. Similarly, through holes are also provided on the release cloth, so the release cloth will not block the penetration of the resin. In this embodiment, the time required to lay the above raw materials is 15 - 25 min. Then, the upper mold 1 is pressed onto the lower mold 2 so that the raw materials are located in the lower mold cavity 21. The air extraction hole 6 on the upper mold 1 has been previously connected to a vacuum device (any device capable of performing vacuum extraction is applicable). Similarly, the glue injection seat 4 on the upper mold 1 has also been previously connected to a glue injection container (which can be a glue injection bucket, a glue injection box, a stirring bucket, etc.). Subsequently, the vacuum device is started to evacuate the lower mold cavity 21. When the vacuum degree of the lower mold cavity 21 reaches -0.08 to 0.10 MPa, resin is injected. Since the lower mold cavity 21 is in a vacuum state, the resin in the glue injection container can be sucked into the glue injection seat 4 through the pipeline, and then through the guidance of the glue injection groove 5, the resin is gradually sucked to the release cloth, the flow guide net, and finally quickly and evenly penetrates into the fiberglass cloth. After stopping the injection of resin, the vacuum is continued to be maintained. After pressure holding for 15 - 25 min (i.e., curing for 15 - 25 min), the upper mold 1 and the lower mold 2 are separated, and the fiberglass product 100 is thus manufactured. Since the release cloth is placed in advance, the upper mold 1 can be smoothly separated from the upper surface of the fiberglass product 100.

[0034] By providing the lower mold cavity 21 for placing raw materials such as fiberglass cloth, flow guide net, and release cloth, the upper mold 1 for pressing with the lower mold cavity 21, the glue injection seat 4 for connecting with the glue injection container, the radially arranged glue injection groove 5 for guiding the resin to quickly and evenly infiltrate into the fiberglass cloth, and the air extraction hole 6 for connecting with the vacuum device, when the lower mold cavity 21 is gradually evacuated, the resin can be evenly covered over the entire width of the fiberglass cloth and quickly infiltrated into its interior. Without setting multiple glue injection holes and air extraction holes 6, the resin can be quickly and evenly infiltrated into the fiberglass cloth, which is convenient to use.

[0035] Please refer to Figure 1, in some embodiments, multiple injection slots 5 are in a "rice" shape; four air extraction holes 6 are provided, and the four air extraction holes 6 are respectively arranged at four corner positions of the upper mold 1. The resin enters from the injection seat 4 located in the middle, is guided by the "rice"-shaped injection slots 5, and the air extraction holes 6 are arranged at the corner positions of the upper mold 1. Therefore, when the vacuum device evacuates the air, the resin diffuses from the center to the edge of the upper mold 1 gradually, so that the resin can quickly cover the entire width of the fiberglass cloth. Compared with the existing molds, the above structure is simpler, and the installation of the air extraction holes 6 and the vacuum device and the connection of the injection seat 4 and the injection container are faster.

[0036] It should be noted here that since the FRP product 100 needs to be applied to the tunnel protection door, only the preparation of a cuboid FRP is shown in this embodiment. In actual application, the lower mold cavity 21 can be made into a cube, a cylinder, a polyhedron, etc. according to the application field of the finished product.

[0037] Please refer to Figure 3 , in some embodiments, the cross-section of the lower mold 2 is concave, the cross-section of the upper mold 1 is T-shaped, the edge of the upper mold 1 is connected with an elastic sealing strip 3, and the lower end surface of the sealing strip 3 abuts against the upper surface of the edge of the lower mold 2. That is, the lower mold cavity 21 of the lower mold 2 is recessed downward, and the upper mold cavity of the upper mold 1 protrudes downward. Under the combined action of the upper mold 1 and the lower mold 2 during mold closing, the raw materials are clamped. Then, under the action of the vacuum device and the deformation of the sealing strip 3, the external atmospheric pressure presses the upper mold 1 to move downward gradually, so as to compact the raw materials after injecting the resin, making the cured finished product denser and having better structural rigidity.

[0038] Please refer to Figure 4 and Figure 5 , in some embodiments, the edge of the upper mold 1 is bent downward to form a bent edge 11 integrally formed with the upper mold 1. Two clamping strips 31 extending upward are arranged on the upper part of the sealing strip 3. The ends of the two clamping strips 31 gradually approach each other, and an abutting groove 32 is formed between the two clamping strips 31. The bent edge 11 is inserted into the abutting groove 32, and the inner sides of the ends of the two clamping strips 31 respectively abut against the two side walls of the bent edge 11. During use, align the bent edge 11 with the abutting groove 32, and then insert the two clamping strips 31 into the lower end of the bent edge 11 to complete the installation. Since the ends of the two clamping strips 31 approach each other, when the upper mold 1 moves downward to squeeze the ends of the two clamping strips 31, the clamping of the ends of the two clamping strips 31 on the bent edge 11 can be made tighter.

[0039] Please refer to Figure 4 and Figure 5, in some embodiments, an encryption strip 33 is provided on the inner side edge of the inner clamping strip 31. The encryption strip 33 slopes downward, and its end abuts against the inner side wall of the bending edge 11. During the gradual downward movement of the bending edge 11, the sealing strip 3 deforms. The distance between the lower ends of the two clamping strips 31 increases compared with that before deformation. Thus, by providing the downward-sloping encryption strip 33, the connection between the lower die cavity 21 and the outside is further blocked.

[0040] Please refer to Figure 5 , in some embodiments, a hollow groove 34 is provided inside the sealing strip 3. On both sides of the lower end surface of the sealing strip 3, extrusion strips 35 symmetrically arranged along the central axis of the sealing strip 3 are provided. The two extrusion strips 35 respectively abut against the upper surfaces of the edges of the lower die 2. When the bending edge 11 presses the sealing strip 3 downward from above the sealing strip 3, the setting of the hollow groove 34 enables the sealing strip 3 to have greater deformation ability. Then, the two extrusion strips 35 provided below the sealing strip 3 continuously deform and press the upper surfaces of the edges of the lower die 2 with which they abut, further ensuring the vacuum degree of the lower die cavity 21.

[0041] Please refer to Figures 1 - 3 and Figure 6 , in certain embodiments, a pre-buried sealing box 7 communicating with the lower die cavity 21 is provided on the upper surface of the upper die 1. When laying the fiberglass cloth, the prefabricated part 101 is buried in the fiberglass cloth, and its upper part protrudes from the fiberglass cloth. Therefore, when the upper die 1 and the lower die 2 are closed, the prefabricated part 101 needs to be avoided while ensuring the vacuum degree of the lower die cavity 21. Thus, the pre-buried sealing box 7 is provided on the surface of the upper die 1. The obtained fiberglass product 100 can fix the prefabricated part 101 on the finished product, realizing integrated production; and because the prefabricated part 101 is formed and fixed synchronously with the fiberglass cloth and resin, it is beneficial to improve the structural rigidity of the prefabricated part 101 and the fiberglass product 100, thereby improving the structural rigidity of the tunnel protection door.

[0042] Please refer to Figure 1 and Figure 3 , in some embodiments, a plurality of reinforcing ribs 12 are provided on the upper surface of the upper die 1. The reinforcing ribs 12 are provided with a hollow structure, and avoidance holes 13 for avoiding the glue injection groove 5 are provided on the reinforcing ribs 12. The first reinforcing rib and the second reinforcing rib perpendicular to the first reinforcing rib are provided, and the two ends of the first reinforcing rib and the second reinforcing rib are respectively connected to the edge of the upper die 1, so as to improve the strength of the frame of the upper die 1 and prevent the flatness of the upper die cavity from being affected after the upper die 1 is deformed, thereby ensuring the flatness of the upper surface of the fiberglass product 100.

[0043] The present invention also provides a method for preparing fiberglass, including the following steps:

[0044] (1) Separate the upper mold 1 and the lower mold 2, and apply mold release wax on the inner wall of the lower mold cavity 21; lay multiple layers of fiberglass cloth in the lower mold cavity 21, insert the preform 101, and lay a flow guiding net and a mold release cloth on the fiberglass cloth;

[0045] (2) Press the upper mold 1 into the lower mold cavity 21, connect the vacuum device to the air extraction hole 6 through an air pipe, and start the vacuum device to evacuate the lower mold cavity 21;

[0046] (3) Connect the glue injection container to the glue injection seat 4 through a pipeline, open the valve on the pipeline, and enable the resin in the glue injection container to be injected into the lower mold cavity 21 through the glue injection seat 4 and the glue injection groove 5;

[0047] (4) Close the valve on the pipeline, maintain the vacuum degree of the lower mold cavity 21, demold after the resin is cured, and prepare the glass fiber reinforced plastic.

[0048] The steps for preparing the glass fiber reinforced plastic are basically the same as the usage method of the glass fiber reinforced plastic preparation mold mentioned above. The step of inserting the preform 101 is added during the process of laying the raw materials, which will not be elaborated here.

[0049] In some embodiments, the resin includes a modified acrylic resin, a curing agent, and an accelerator, and the resin cures at room temperature. Specifically, the modified acrylic resin is the modified acrylic resin with a flame retardancy of 120° from Fuchen Chemical Industry. The curing agent is an organic peroxide curing agent, specifically methyl ethyl ketone peroxide. The accelerator is an accelerator for curing unsaturated polyester resin at room temperature, specifically T-8.

[0050] Taking the production of a product with dimensions of width × length × height of 1255×2115×78 mm as an example, the resin, calculated by weight, includes 29 - 31 parts of modified acrylic resin, a curing agent accounting for 1.5% - 2.0% of the weight of the modified acrylic resin, and an accelerator accounting for 1.5% - 2.0% of the weight of the modified acrylic resin, and cures under the conditions of a temperature of 16 - 32°C and a time of 15 - 25 min. When the room temperature is relatively low (16°C), a curing agent not higher than 2.0% of the weight of the modified acrylic resin and an accelerator accounting for 2.0% of the weight of the modified acrylic resin can be used. On the contrary, when the room temperature is 32°C, a curing agent accounting for 1.5% of the weight of the modified acrylic resin and an accelerator accounting for 1.5% of the weight of the modified acrylic resin can be used.

[0051] For the production of the product with the above dimensions, the time required for laying the raw materials is 15 - 25 min, the time-consuming for injecting the resin is about 15 - 20 min, the curing time is 15 - 25 min, and the total time-consuming is about 45 - 70 min, which can shorten the preparation time of the glass fiber reinforced plastic and improve the production efficiency. When the number of layers of fiberglass cloth laid is less than 32 layers, the total time-consuming for producing the glass fiber reinforced plastic will be shortened.

[0052] In summary, the method for preparing a fiberglass mold provided by the present invention includes a lower mold cavity 21 for placing raw materials such as fiberglass cloth, flow guiding net, and demolding cloth, an upper mold 1 for pressing with the lower mold cavity 21, a glue injection seat 4 for connecting with a glue injection container, a radially arranged glue injection groove 5 for guiding the resin to quickly and evenly infiltrate into the fiberglass cloth, and an air extraction hole 6 for connecting with a vacuum device. When the lower mold cavity 21 is gradually evacuated, the resin can be evenly covered on the entire surface of the fiberglass cloth and quickly infiltrated into its interior. Without setting multiple glue injection holes and air extraction holes 6, the resin can be quickly and evenly infiltrated into the fiberglass cloth, which is convenient to use. A sealing strip 3 is provided to improve the connection tightness between the upper mold 1 and the lower mold 2. The clamping strip 31, the encryption strip 33, the hollow groove 34, and the extrusion strip 35 are all used to ensure the vacuum degree of the lower mold cavity 21.

[0053] The method for preparing fiberglass provided by the present invention includes coating a demolding wax on the lower mold cavity 21, laying the fiberglass cloth, inserting a prefabricated part 101, laying the flow guiding net and the demolding cloth, closing the mold, evacuating the lower mold cavity 21 by a vacuum device, injecting resin, and curing at room temperature; realizing the integral molding and smooth demolding of the fiberglass product 100 and the prefabricated part 101, and being able to be quickly molded in a short time, which is beneficial to improving the production efficiency.

[0054] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0055] In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and inventive concepts of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A preparation mold for fiberglass reinforced plastic, comprising an upper mold and a lower mold. A lower mold cavity is arranged in the lower mold, and the upper mold is pressed against the lower mold; it is characterized in that, A glue injection seat is arranged in the middle of the upper mold. The glue injection seat is communicated with a plurality of glue injection grooves respectively arranged on the upper surface of the upper mold. The plurality of glue injection grooves are respectively communicated with the lower mold cavity, and the plurality of glue injection grooves extend radially towards the edge of the upper mold. A plurality of air extraction holes communicated with the lower mold cavity are arranged at the edge of the upper mold; the plurality of glue injection grooves are in a "rice" shape; four air extraction holes are arranged, and the four air extraction holes are respectively arranged at the four corner positions of the upper mold; the cross section of the lower mold is concave, the cross section of the upper mold is T-shaped, the edge of the upper mold is connected with an elastic sealing strip, and the lower end surface of the sealing strip abuts against the upper surface of the edge of the lower mold; the edge of the upper mold is bent downwards to form a bent edge. Two clamping strips extending upwards are arranged on the upper part of the sealing strip. The ends of the two clamping strips gradually approach each other, and an abutting groove is formed between the two clamping strips. The bent edge is inserted into the abutting groove, and the inner sides of the ends of the two clamping strips respectively abut against the two side walls of the bent edge; a reinforcing strip is arranged on the inner side edge of the clamping strip located on the inner side. The reinforcing strip inclines downwards, and its end abuts against the inner side wall of the bent edge.

2. The glass fiber reinforced plastic preparation mold according to claim 1, characterized in that, A hollow groove is arranged in the sealing strip. On both sides of the lower end surface of the sealing strip, extrusion strips symmetrically arranged along the central axis of the sealing strip are arranged. The two extrusion strips respectively abut against the upper surface of the edge of the lower mold.

3. The fiberglass reinforced plastic preparation mold according to claim 1, characterized in that, A pre-buried sealing box communicated with the lower mold cavity is arranged on the upper surface of the upper mold.

4. The glass fiber reinforced plastic preparation mold according to claim 1, characterized in that, A plurality of reinforcing ribs are arranged on the upper surface of the upper mold. The reinforcing ribs are of a hollow structure, and avoiding holes for avoiding the glue injection grooves are arranged on the reinforcing ribs.

5. A method for preparing fiberglass reinforced plastic, characterized in that, The following steps are included: Separate the upper mold and the lower mold in the glass fiber reinforced plastic preparation mold according to any one of claims 1-4. Apply release wax on the inner wall of the lower mold cavity; lay multiple layers of glass fiber cloth in the lower mold cavity, insert a prefabricated part, and lay a flow guiding net and a release cloth on the glass fiber cloth; Press the upper mold into the lower mold cavity. Connect a vacuum device with the air extraction holes through an air pipe, and start the vacuum device to evacuate the lower mold cavity; Connect a glue injection container with the glue injection seat through a pipeline, open the valve on the pipeline, and inject the resin in the glue injection container into the lower mold cavity through the glue injection seat and the glue injection grooves; Close the valve on the pipeline, maintain the vacuum degree of the lower mold cavity, and demold after the resin is cured to prepare glass fiber reinforced plastic.

6. The method for preparing fiberglass reinforced plastic according to claim 5, characterized in that, The resin includes a modified acrylic resin, a curing agent and an accelerator, and the resin cures at room temperature.

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