A reusable integrated vacuum self-sealing silicone bag film and its preparation method

Abstract

The present invention provides a reusable integrated vacuum self-sealing silicone bag film and a preparation method thereof. The preparation method of the reusable integrated vacuum self-sealing silicone bag film comprises the following steps: cleaning the surface of a mold; placing a cavity preform, a flow guiding net, a pipeline preform, a baffle and a connection preform on the mold, wherein the pipeline preform comprises a pipeline glue inlet preform and a pipeline seal preform; forming a vacuum sealing mechanism, a glue inlet pipeline, a flow guiding passage and a plug; forming the bag body of the silicone bag film; demolding; and performing airtight inspection. For the preparation method of the reusable integrated vacuum self-sealing silicone bag film of the present invention, firstly, the silicone bag film can be reused, reducing the material cost of vacuum-assisted molding; secondly, a vacuum sealing mechanism, a glue inlet pipeline and a flow guiding passage are integrated on the silicone bag film, and when in use, a flow guiding net and a sealing tape do not need to be used, greatly saving the usage amount of consumables such as glue injection pipelines, flow guiding nets and sealing tapes and improving the encapsulation efficiency.

Description

Technical Field

[0001] The present invention relates to the field of resin matrix composite material forming, and more particularly, to a reusable integrated vacuum self-sealing silicone bag film and a preparation method thereof. Background Art

[0002] The current mainstream vacuum assisted forming process generally uses plastic film as the bag film for product sealing, which has some obvious disadvantages and deficiencies: plastic film is extremely vulnerable to environmental interface and operation methods, resulting in damage, affecting the sealing effect, and even causing product quality problems; using plastic film for fabric encapsulation requires certain skills, has high requirements for the skills of operators, and the encapsulation process is complex with a large amount of labor; plastic film has limited high temperature tolerance and cannot meet the requirements of some thermosetting resin perfusion molding; plastic film and its accompanying sealing tape are disposable consumables with high manufacturing costs; a large amount of solid waste formed after product curing and demolding needs to be treated, increasing production costs. In summary, plastic bag film does not have good economic usability.

[0003] Based on the high toughness, tear resistance and other characteristics of the material itself, compared with plastic vacuum bag film, silicone bag film used for vacuum assisted forming of composite materials has obvious advantages of wear resistance, convenient encapsulation and reusable.

[0004] The patent with publication number CN102632623A in the prior art discloses a method for preparing carbon fiber composite materials by a silicone rubber bag closed mold process, which adopts the following steps: preparation of silicone rubber bag film: using silicone rubber and mesh cloth to prepare silicone rubber bag film on the mold surface for later use; forming of carbon fiber composite materials: laying reinforcing fiber cloth on the mold; closing the mold with silicone rubber bag film; pouring resin material by means of vacuum pumping; maintaining a fixed pressure to form the material; demolding after the material is cured to obtain the product. Although this patent uses silicone rubber film instead of plastic vacuum bag and can be reused, the silicone rubber bag film still needs to be sealed around the silicone film with a sealing tape to close the mold, and the self-sealing of the bag film with the mold under vacuum is not achieved; a flow guiding net still needs to be laid on the fabric surface to guide the resin flow, and the sealing tape and the flow guiding net are disposable consumables, with complex operation and high production costs; moreover, the laying thickness of carbon fiber in this patent is 0.3 - 0.6mm, with limited application range and cannot meet the forming process requirements of composite materials with centimeter or higher thickness.

[0005] In the prior art, the patent with publication number CN110884762A discloses a reusable vacuum bag, which includes a bag body and a bag mouth. The bag body includes silica gel and a reinforced mesh cloth. The bag mouth is arranged at the lower end of the bag body, and sealing mechanisms are symmetrically arranged at the bag mouth. The sealing mechanisms are composed of sealing strips symmetrically arranged on the bag body. The sealing strips are made of silica gel material, and the cross-section of the sealing strips is trapezoidal or D-shaped. The reinforced mesh cloth is a low-density small-hole grid cloth, and the grids of the reinforced mesh cloth are hexagonal grids. The sealing mechanisms and the bag body are combined through a silica gel adhesive to form a reusable vacuum bag. Although this patent enables the vacuum bag to be reusable, each time of encapsulation requires cleaning the bonding interface between the sealing rubber strip and the bag body, and the operation is complicated and not concise. Once the bonding interface is not firm, the sealing function cannot be achieved. In a vacuum state, the silica gel vacuum bag will undergo a small amount of deformation and displacement. With only one circle of sealing mechanism, it is very difficult to achieve a lasting and stable vacuum environment, and the quality of composite material forming cannot be ensured. Moreover, this patent does not integrate a flow guiding medium, etc. on the vacuum bag, and still requires laying a flow guiding net during the use process. From the perspective of operation simplicity and production cost, there are still deficiencies.

[0006] Thus, in the prior art, in the forming solutions of composite material silica gel vacuum bags, none of them integrate the flow guiding medium. Some still need to use sealing tapes for auxiliary sealing, and the material cost cannot be effectively controlled. Some solutions have overly simple sealing mechanisms and require manual bonding, the operation is not concise enough, the labor cost cannot be effectively reduced, and the stability and reliability of the process cannot be guaranteed either.

[0007] In view of this, the present invention is specifically proposed. Summary of the Invention

[0008] The purpose of the present invention is to provide a reusable integrated vacuum self-sealing silica gel bag film and a preparation method thereof, so as to solve the problems in the prior art that in the forming solutions of composite material silica gel vacuum bags, none of them integrate the flow guiding medium. Some still need to use sealing tapes for auxiliary sealing, and the material cost cannot be effectively controlled. Some solutions have overly simple sealing mechanisms and require manual bonding, the operation is not concise enough, the labor cost cannot be effectively reduced, and the stability and reliability of the process cannot be guaranteed either.

[0009] To achieve the above purpose, the technical solution of the present invention is realized as follows:

[0010] A preparation method of a reusable integrated vacuum self-sealing silica gel bag film, the preparation method of the reusable integrated vacuum self-sealing silica gel bag film includes the following steps:

[0011] S1. Clean the surface of the clean mold;

[0012] S2. Place the cavity preform, flow guide net, pipeline preform, baffle, and connection preform on the mold. The pipeline preform includes a pipeline glue inlet preform and a pipeline seal preform.

[0013] S3. Form the vacuum sealing mechanism, glue inlet pipeline, flow guide passage, and pipe plug.

[0014] S4. Form the silica gel bag film body.

[0015] S5. Demold.

[0016] S6. Conduct airtight inspection.

[0017] For the preparation method of the reusable integrated vacuum self-sealing silica gel bag film of the present invention, first, the silica gel bag film can be reused, reducing the material cost of vacuum-assisted molding; second, a vacuum sealing mechanism, a glue inlet pipeline, and a flow guide passage are integrated on the silica gel bag film. When in use, there is no need to lay a flow guide net to guide the resin flow, nor is it necessary to seal the silica gel bag film with a sealing tape, greatly saving the consumption of consumables such as injection pipelines, flow guide nets, and sealing tapes, and improving the encapsulation efficiency.

[0018] Further, step S2 includes the following steps:

[0019] S21. Place the cavity preform on the upper surface of the mold, flatly lay a polyester film on the surface of the cavity preform, and orthogonally lay two layers of flow guide nets on the corresponding area of the cavity on the upper surface of the polyester film.

[0020] S22. Place and fix the pipeline glue inlet preform on the upper surface of the cavity preform, place and fix the pipeline seal preform around the periphery of the cavity preform, set a baffle around the periphery of the pipeline seal preform, and set a connection preform between the pipeline seal preform and the cavity preform.

[0021] Further, step S3 includes the following steps:

[0022] S31. Prepare the first silicone rubber and the second silicone rubber.

[0023] S32. Conduct vacuum degassing on the first silicone rubber and the second silicone rubber.

[0024] S33. Form the vacuum sealing mechanism and the glue inlet pipeline: evenly apply the first silicone rubber on the surface of the pipeline glue inlet preform until the first silicone rubber coating completely covers the pipeline preform to form the glue inlet pipeline, evenly apply the first silicone rubber on the surface of the pipeline seal preform until the first silicone rubber coating completely covers the pipeline preform to form the vacuum sealing mechanism, and the thickness of the first silicone rubber coating ≥ 5 mm.

[0025] S34. Forming the flow guiding passage: Uniformly coat the surface of the flow guiding net with the first silicone rubber until the continuous film completely covers the flow guiding net to form the flow guiding passage. The thickness of the continuous film on the flow guiding net is 0.5 - 1 mm;

[0026] S35. Forming the pipe plug: Fix the sleeve on the pipeline prefabricated part with the first silicone rubber; Pour the second silicone rubber into the sleeve from the upper opening of the sleeve, and then insert the pipe plug prefabricated part into the center of the sleeve, and naturally cure at room temperature for 1 - 2 h to form the pipe plug.

[0027] Further, step S4 specifically includes:

[0028] Disperse and pour the second silicone rubber in the cavity prefabricated part area, the interval area between the pipeline sealing prefabricated part and the cavity prefabricated part, the pipeline sealing prefabricated part area, and the area between the pipeline sealing prefabricated part and the baffle to form a continuous second silicone rubber coating with a thickness of 3 - 6 mm, and naturally cure at room temperature for 2 - 12 h.

[0029] Further, step S5 specifically includes the following steps:

[0030] After sufficient curing, perform overall demolding on the silicone bag film, remove the cavity prefabricated part, the flow guiding net, the pipeline prefabricated part, the baffle, the connection prefabricated part, the sleeve and the pipe plug prefabricated part, and dredge the pipe plug and the pipeline main body.

[0031] Further, step S6 specifically includes the following steps:

[0032] Perform silicone bag film encapsulation on a clean mold. After the pipeline connection is completed, turn on the vacuum pump. After the ultimate vacuum degree ≥ 0.094 MPa, close the vacuum pump valve and keep the pressure for 5 min.

[0033] Further, the pipeline glue inlet prefabricated part includes a first glue inlet pipe prefabricated part and a second glue inlet pipe prefabricated part. The first glue inlet pipe prefabricated part and the second glue inlet pipe prefabricated part are perpendicularly arranged, and the first glue inlet pipe prefabricated part and the second glue inlet pipe prefabricated part are arranged on the center line of the cavity prefabricated part.

[0034] Further, step S31 specifically includes the following steps:

[0035] The first silicone rubber includes a silicone rubber A component and a silicone rubber B component. The mass ratio of the silicone rubber A component to the silicone rubber B component is 1:1. Store the weighed silicone rubber A component and silicone rubber B component in a clean container, stir and mix until the color is uniform; Both the silicone rubber A component and the silicone rubber B component are room temperature condensation type vulcanized silicone rubbers, and the room temperature condensation type vulcanized silicone rubber is one of methyl room temperature vulcanized silicone rubber, methyl bisphenyl room temperature vulcanized silicone rubber, methyl block room temperature vulcanized silicone rubber, and fluorosilicone rubber.

[0036] Further, the first silicone rubber further includes a thickener. The components of the second silicone rubber are the same as those of the first silicone rubber, and the dosage of the thickener in the first silicone rubber is greater than that in the second silicone rubber.

[0037] A reusable integrated vacuum self-sealing silicone bag film, which is prepared by using the preparation method of a reusable integrated vacuum self-sealing silicone bag film described in any one of the above. The reusable integrated vacuum self-sealing silicone bag film includes a silicone bag film body and a silicone bag film cavity. The silicone bag film cavity is arranged at the lower end of the silicone bag film body. An inlet pipeline and a guiding flow passage are arranged on one side of the silicone bag film body close to the silicone bag film cavity. A vacuum sealing mechanism is arranged on the silicone bag film body, and the vacuum sealing mechanism is arranged around the silicone bag film cavity.

[0038] The present invention provides a reusable integrated vacuum self-sealing silicone bag film and a preparation method. Compared with the prior art, the reusable integrated vacuum self-sealing silicone bag film and the preparation method of the present invention have the following beneficial effects:

[0039] 1) For the reusable integrated vacuum self-sealing silicone bag film and the preparation method of the present invention, the present invention provides a new production method for a vacuum self-sealing silicone bag. The obtained silicone bag film can be reused, reducing the material cost of vacuum-assisted molding.

[0040] 2) For the reusable integrated vacuum self-sealing silicone bag film and the preparation method of the present invention, based on the suction cup principle, through the vacuum sealing mechanism, the self-sealing of the silicone bag on the mold surface is realized under the action of vacuum. The integration of the guiding flow function on the silicone bag film is realized by the method of engraving and forming, thereby solving the deficiencies of the existing silicone bag in the composite material molding process, eliminating the use of disposable consumables such as sealing tapes and guiding meshes, further simplifying the packaging operation, reducing the production cost, greatly improving the labor efficiency and the stability of the composite material molding process, and being a feasible molding scheme for silicone vacuum bag film composites, especially having strong practical significance for the production of some small-sized, flat and large-batch composite material products.

[0041] 3) For the reusable integrated vacuum self-sealing silicone bag film and the preparation method of the present invention, the molding and use of the silicone bag film are no longer restricted by the need for a specific mold in the past, and the vacuum bag can be made and used correspondingly on any flat mold, reducing the mold making and processing costs.

[0042] 4) The reusable integrated vacuum self-sealing silica gel bag film and its preparation method according to the present invention are used in vacuum-assisted molding, with convenient and rapid demolding, no generation of a large amount of solid waste, good environmental friendliness, and greatly reduced solid waste treatment costs.

[0043] 5) The reusable integrated vacuum self-sealing silica gel bag film and its preparation method according to the present invention can not only be applied to the vacuum-assisted liquid injection molding process, but also be applied in many scenarios such as material vacuum pre-pressing and bonding and compounding. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 One of the layout top view schematic diagrams of the preparation method of the reusable integrated vacuum self-sealing silica gel bag film according to the embodiment of the present invention;

[0045] Figure 2 The three-dimensional layout schematic diagram of the cavity preform and the flow guide net of the preparation method of the reusable integrated vacuum self-sealing silica gel bag film according to the embodiment of the present invention;

[0046] Figure 3 The three-dimensional schematic diagram of the pipeline preform of the preparation method of the reusable integrated vacuum self-sealing silica gel bag film according to the embodiment of the present invention;

[0047] Figure 4 The side view layout schematic diagram of the sleeve, pipe plug preform and pipeline preform of the preparation method of the reusable integrated vacuum self-sealing silica gel bag film according to the embodiment of the present invention;

[0048] Figure 5 Another layout top view schematic diagram of the preparation method of the reusable integrated vacuum self-sealing silica gel bag film according to the embodiment of the present invention;

[0049] Figure 6 The partial cross-sectional view of the first silicone rubber coating, the second silicone rubber coating, the pipeline preform, the baffle and the cavity preform of the preparation method of the reusable integrated vacuum self-sealing silica gel bag film according to the embodiment of the present invention;

[0050] Figure 7 The three-dimensional schematic diagram of the baffle of the preparation method of the reusable integrated vacuum self-sealing silica gel bag film according to the embodiment of the present invention;

[0051] Figure 8 The three-dimensional schematic diagram of the sleeve of the preparation method of the reusable integrated vacuum self-sealing silica gel bag film according to the embodiment of the present invention;

[0052] Figure 9Stereoscopic schematic diagram of a tube plug prefabricated part of a preparation method of a reusable integrated vacuum self-sealing silica gel bag film according to an embodiment of the present invention;

[0053] Figure 10 Cross-sectional view of a reusable integrated vacuum self-sealing silica gel bag film according to an embodiment of the present invention.

[0054] Explanation of reference numerals:

[0055] 1. Cavity prefabricated part; 2. Flow guiding net; 3. Pipeline prefabricated part; 31. Pipeline glue inlet prefabricated part; 311. First glue inlet pipe prefabricated part; 312. Second glue inlet pipe prefabricated part; 32. Pipeline sealing prefabricated part; 321. First sealing pipe prefabricated part; 322. Second sealing pipe prefabricated part; 323. Third sealing pipe prefabricated part; 4. Baffle; 5. Connecting prefabricated part; 6. Sleeve; 7. Tube plug prefabricated part; 8. Mold; 9. Tube plug; 91. First tube plug; 92. Second tube plug; 10. Vacuum sealing mechanism; 101. First vacuum sealing pipeline; 102. Second vacuum sealing pipeline; 103. Third vacuum sealing pipeline; 11. Silica gel bag film bag body; 12. Glue inlet pipeline; 13. First silicone rubber coating; 14. Second silicone rubber coating; 15. Silica gel bag film cavity. Detailed implementation manners

[0056] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The descriptions such as "first" and "second" mentioned in the embodiments of the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0057] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0058] The present invention provides a preparation method of a reusable integrated vacuum self-sealing silica gel bag film. As Figures 1 to 10 shown, the preparation method of the reusable integrated vacuum self-sealing silica gel bag film includes the steps:

[0059] S1. Clean the surface of the mold 8;

[0060] S2. Place the cavity preform 1, the flow guiding net 2, the pipeline preform 3, the baffle 4 and the connection preform 5 on the mold 8. The pipeline preform 3 includes a pipeline glue inlet preform 31 and a pipeline sealing preform 32;

[0061] S3. The vacuum sealing mechanism 10, the glue inlet pipeline 12, the flow guiding passage and the pipe plug 9 are formed;

[0062] S4. The silica gel bag film body 11 is formed;

[0063] S5. Demould;

[0064] S6. Air tightness inspection.

[0065] For the preparation method of the reusable integrated vacuum self-sealing silica gel bag film described in the present invention, steps S1 to S6 are interrelated and act together. First, the silica gel bag film can be reused, reducing the material cost of vacuum-assisted molding. Second, a vacuum sealing mechanism, a glue inlet pipeline and a flow guiding passage are integrated on the silica gel bag film. When in use, there is no need to lay a flow guiding net to guide the resin flow, nor is it necessary to seal the silica gel bag film with a sealing tape, greatly saving the use amount of consumables such as injection pipelines, flow guiding nets and sealing tapes, and improving the encapsulation efficiency.

[0066] Specifically, in step S1, the size of the mold 8 is larger than the contour size of the silica gel bag film. The mold 8 is placed horizontally, and the surface of the mold 8 is cleaned, wiped and dried.

[0067] More specifically, in step S1, the upper surface of the mold 8 is wiped with acetone and / or ethanol, etc.

[0068] More specifically, the first coating must be completed within 2 hours after the surface of the mold 8 is cleaned. Otherwise, it needs to be cleaned again and ensure that it is dry and free of moisture.

[0069] Specifically, step S2 includes the following steps:

[0070] S21. Place the cavity preform 1 on the upper surface of the mold 8. A polyester film (not shown in the figure) is evenly laid on the surface of the cavity preform 1, and two layers of flow guiding nets 2 are orthogonally laid on the corresponding area of the cavity on the upper surface of the polyester film;

[0071] Laying a polyester film evenly on the surface of the cavity preform 1 is for two reasons. First, it is difficult to clean the surface of the cavity preform 1 completely. If there are sundries, it may cause the silica gel to be poisoned and unable to cure. Laying a polyester film evenly on the surface of the cavity preform 1 can avoid the situation that the silica gel is poisoned and unable to cure due to sundries. Second, after laying a polyester film evenly on the surface of the cavity preform 1, the surface of the polyester film is smooth, clean and dry, which is beneficial to the silica gel casting and curing.

[0072] More specifically, the size of the polyester film is larger than that of the cavity preform 1, and the four corners of the polyester film are cut and fitted to the surface of the mold 8.

[0073] More specifically, the size of the flow guide net 2 is 3 - 5 cm smaller than the size of the cavity.

[0074] S22. As Figure 1 shown, place and fix the pipeline glue inlet preform 31 on the upper surface of the cavity preform 1, place and fix the pipeline sealing preform 32 around the periphery of the cavity preform 1, set the baffle 4 around the periphery of the pipeline sealing preform 32, and set the communication preform 5 between the pipeline sealing preform 32 and the cavity preform 1.

[0075] More specifically, the materials of the preforms such as the cavity preform 1, the pipeline preform 3, and the baffle 4 are not strictly limited, as long as they do not chemically react with the silicone rubber and do not affect the curing of the silicone rubber.

[0076] More specifically, the upper and lower surfaces of the cavity preform 1 are flat and have the same thickness, and the thickness of the cavity preform 1 is 1 mm - 60 mm.

[0077] More specifically, as Figure 3 shown, the pipeline preform 3 is cylindrical, the diameter of the pipeline preform 3 is 10 - 30 mm, and the pipeline preform 3 has a certain flexibility.

[0078] More specifically, as Figure 7 shown, the baffle 4 is a cuboid, and the thickness of the baffle 4 is 3 - 10 mm.

[0079] Specifically, the number of the pipeline glue inlet preforms 31 is not specifically limited.

[0080] More specifically, as Figure 1 and Figure 5 shown, the pipeline glue inlet preform 31 includes a first glue inlet pipe preform 311 and a second glue inlet pipe preform 312.

[0081] Specifically, the positional relationship of the pipeline glue inlet preform 31 is not specifically limited and can be adjusted according to the characteristics such as the size and shape of the product.

[0082] The first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 are vertically arranged, and the first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 are arranged on the center line of the cavity preform 1.

[0083] Specifically, the number of the pipeline sealing preforms 32 is not specifically limited.

[0084] More specifically, the pipeline sealing preform 32 includes at least a first sealing pipe preform 321.

[0085] More specifically, as Figure 1 and Figure 5 shown, a communication preform 5 is provided between the four corners on the side of the cavity preform 1 and the pipeline sealing preform 32;

[0086] The distance between the pipeline sealing preform 32 and the cavity preform 1 is 2 cm to 10 cm; the distance between the baffle 4 and the pipeline sealing preform 32 is 2 cm to 10 cm;

[0087] The pipeline sealing preform 32 is connected end to end around the periphery of the cavity preform 1 to form a closed loop.

[0088] Specifically, step S3 includes the following steps:

[0089] S31. Prepare the first silicone rubber and the second silicone rubber;

[0090] S32. Degas the first silicone rubber and the second silicone rubber;

[0091] S33. Form the vacuum sealing mechanism 10 and the glue inlet pipeline 12: evenly apply the first silicone rubber on the surface of the pipeline glue inlet preform 31 until the first silicone rubber coating 13 completely covers the pipeline glue inlet preform 31 to form the glue inlet pipeline 12, and evenly apply the first silicone rubber on the surface of the pipeline sealing preform 32 until the first silicone rubber coating 13 completely covers the pipeline sealing preform 32 to form the vacuum sealing mechanism 10. The thickness of the first silicone rubber coating 13 is ≥5 mm;

[0092] S34. Form the fluid conduction path: evenly coat the first silicone rubber on the surface of the flow guiding net 2 until the continuous film completely covers the flow guiding net 2 to form the fluid conduction path. The thickness of the continuous film on the flow guiding net 2 is 0.5 - 1 mm;

[0093] S35. Form the pipe plug 9: fix the sleeve 6 on the pipeline preform 3 with the first silicone rubber; pour the second silicone rubber into the inside of the sleeve 6 from the upper opening of the sleeve 6, as Figure 4 shown, and then insert the pipe plug preform 7 into the center of the sleeve 6 and naturally cure at room temperature for 1 - 2 h to form the pipe plug 9.

[0094] More specifically, for step S31, prepare the first silicone rubber and the second silicone rubber: the first silicone rubber includes a silicone rubber A component and a silicone rubber B component, and the mass ratio of the silicone rubber A component to the silicone rubber B component is 1:1. Store the weighed silicone rubber A component and silicone rubber B component in a clean container and stir and mix until the color is uniform.

[0095] More specifically, both the silicone rubber A component and the silicone rubber B component are room-temperature condensation-curing silicone rubbers, and the room-temperature condensation-curing silicone rubber is one of methyl room-temperature vulcanizing silicone rubber, methyl bisphenyl room-temperature vulcanizing silicone rubber, methyl block room-temperature vulcanizing silicone rubber, and fluorosilicone rubber.

[0096] More specifically, in step S31, following the principle of preparing in small amounts and multiple times, the preparation amount of the first silicone rubber per single time is 2000 - 3000 g.

[0097] The first silicone rubber further includes a thickening agent. The components of the second silicone rubber are the same as those of the first silicone rubber. The difference between the second silicone rubber and the first silicone rubber lies only in the thickening agent, and the dosage of the thickening agent in the first silicone rubber is greater than that in the second silicone rubber.

[0098] The first silicone rubber has a high viscosity and poor flowability, which is convenient for brushing on vertical surfaces and areas that need to be piled up, such as pipelines and pipe plugs; the second silicone rubber has a low viscosity and good flowability, which is convenient for brushing on flat areas.

[0099] The first silicone rubber and the second silicone rubber are anti-aging, have high toughness and are resistant to tearing, and the elongation at break is ≥ 200%.

[0100] The environmental conditions for preparing the first silicone rubber and the second silicone rubber are as follows: temperature 15 - 25°C, humidity ≤ 65%. The preparation amount per single time is preferably 2000 - 3000 g. When mixing, the mechanical stirring time is not less than 5 min, and the manual stirring time is not less than 10 min until the appearance is uniform.

[0101] The mixing ratio of the first silicone rubber and the second silicone rubber is both silicone rubber A component: silicone rubber B component = 1:1; at room temperature of 15 - 25°C, the operation time is 30 - 40 min; at room temperature of 25 - 35°C, the operation time is 15 - 25 min.

[0102] More specifically, in step S32, vacuum degassing is performed on the first silicone rubber and the second silicone rubber: the mixed first silicone rubber and second silicone rubber are respectively placed in a vacuum buffer tank, the intake valve is closed, the exhaust valve is connected to the vacuum, the vacuum is turned on. When the vacuum degree reaches 0.090 MPa or above, maintain the vacuum state for 5 - 10 min, observe the bubbling situation of the silicone rubber through the observation window, release the pressure through the intake valve to prevent the silicone rubber bubbles from overflowing, and take it out after the pressure is completely released;

[0103] More specifically, in step S33, a clean brush and a scraper are used to evenly apply the first silicone rubber on the surface of the pipeline preform 3, brushing back and forth to avoid dripping and missed brushing, and try to ensure that the coating thickness is uniform. One layer of reinforcing gauze is applied at intervals of 1-2 mm in the brushing area to increase the strength of the pipeline part after curing until the first silicone rubber coating 13 completely covers the pipeline preform 3 and the thickness of the first silicone rubber coating 13 on the pipeline preform 3 is ≥ 5 mm;

[0104] More specifically, the reinforcing gauze is a high-toughness degreased fiber cotton mesh cloth, and this setting can increase the strength of the pipeline part after curing.

[0105] More specifically, in step S34, forming the flow passage: The first silicone rubber is evenly coated on the surface of the flow guide net 2 until the continuous film completely covers the flow guide net 2, and the thickness of the continuous film on the flow guide net 2 is 0.5-1 mm.

[0106] In step S34, the first silicone rubber has poor fluidity and will be blocked by the flow guide net 2, thus forming a flow channel imprint.

[0107] More specifically, in step S35, the sleeve 6 is fixed on the pipeline preform 3 in the vertical direction using the first silicone rubber; the second silicone rubber is poured into the sleeve 6 from the upper opening of the sleeve 6, and then the pipe plug preform 7 is vertically inserted into the sleeve 6 from top to bottom and fixed at the center of the sleeve 6 to ensure no slipping or floating, and it is naturally cured at room temperature for 1-2 h.

[0108] More specifically, in step S35, the sleeve 6 is fixed on the pipeline preform 3 in the vertical direction using the first silicone rubber, and after 20 min - 30 min, the second silicone rubber is poured into the sleeve 6 from the upper opening of the sleeve 6 to prevent the second silicone rubber from flowing out due to insufficient curing of the first silicone rubber.

[0109] Specifically, the diameter of the pipeline preform 3 and the inner diameter of the sleeve 6 are not specifically limited and can be determined according to the specific scenario of the later use of the silicone bag film.

[0110] Specifically, step S4 specifically includes:

[0111] The second silicone rubber is dispersedly poured in the area of the cavity preform 1, the interval area between the pipeline seal preform 32 and the cavity preform 1, the area of the pipeline seal preform 32, and the area between the pipeline seal preform 32 and the baffle 4 to form a continuous second silicone rubber coating 14 with a thickness of 3-6 mm, and it is naturally cured at room temperature for 1-12 h. Through the natural flow of the second silicone rubber, it is connected to the previous pipeline forming part to form an integral body.

[0112] The dosage of the second silicone rubber is not specifically limited, and the dosage of the second silicone rubber can be calculated according to the flow-casting area, combined with the density of the second silicone rubber and the designed thickness of the bag body of the silicone bag film.

[0113] Specifically, step S5 specifically includes the following steps:

[0114] After sufficient curing, the silicone bag film is demolded as a whole, and the cavity preform 1, the flow guide net 2, the pipeline preform 3, the baffle 4, the communication preform 5, the sleeve 6 and the pipe plug preform 7 are removed, and the pipe plug 9 and the pipeline main body are dredged.

[0115] Step S6 specifically includes the following steps:

[0116] The silicone bag film is encapsulated on the clean mold 8. After the pipeline connection is completed, the vacuum pump is turned on. After the ultimate vacuum degree ≥ 0.094 MPa, the vacuum pump valve is closed and the pressure is maintained for 5 min.

[0117] If there is no pressure drop after maintaining the pressure for 5 min, it is determined that the silicone bag film can meet the process requirements of vacuum-assisted forming.

[0118] The reusable integrated vacuum self-sealing silicone bag film prepared by using the above-mentioned reusable integrated vacuum self-sealing silicone bag film preparation method, as Figure 10 shown, the reusable integrated vacuum self-sealing silicone bag film includes a silicone bag film body 11 and a silicone bag film cavity 15. The silicone bag film cavity 15 is arranged at the lower end of the silicone bag film body 11. On the silicone bag film body 11, a glue inlet pipeline 12 and a flow guide passage are arranged on one side close to the silicone bag film cavity 15. A vacuum sealing mechanism 10 is arranged on the silicone bag film body 11, and the vacuum sealing mechanism 10 is arranged around the silicone bag film cavity 15.

[0119] Example 1

[0120] In this embodiment, the environmental temperature is 25 °C and the humidity is 55%. A silicone bag film with a cavity size of 500 mm × 500 mm × 5 mm is manufactured. The specific steps are as follows:

[0121] S1. Clean the surface of the clean mold 8;

[0122] S2. Place the cavity preform 1, the flow guide net 2, the pipeline preform 3, the baffle 4 and the communication preform 5 on the mold 8. The pipeline preform 3 includes a pipeline glue inlet preform 31 and a pipeline sealing preform 32;

[0123] S3. The vacuum sealing mechanism 10, the glue inlet pipeline 12, the flow guide passage and the pipe plug 9 are formed;

[0124] S4. The silicone bag film body 11 is formed;

[0125] S5. Demold;

[0126] S6. Air tightness inspection.

[0127] Specifically, in step S1, the size of the mold 8 is larger than the contour size of the silicone bag film. The mold 8 is placed horizontally, and the surface of the mold 8 is cleaned, wiped, and dried. The upper surface of the mold 8 is wiped with acetone / ethanol, etc., to ensure that the surface of the mold 8 is dry and clean.

[0128] Specifically, step S2 includes the following steps:

[0129] S21. Place the cavity preform 1 on the mold 8. The size of the cavity preform 1 is 500 mm × 500 mm × 5 mm. Polyester film is laid flat on the surface of the cavity preform 1, and two layers of diversion nets 2 are orthogonally laid on the corresponding area of the cavity on the upper surface of the polyester film;

[0130] S22. Place and fix the pipeline glue inlet preform 31 on the upper surface of the cavity preform 1, place and fix the pipeline seal preform 32 around the periphery of the cavity preform 1, set a baffle 4 around the periphery of the pipeline seal preform 32, and set a communication preform 5 between the pipeline seal preform 32 and the cavity preform 1.

[0131] Specifically, the pipeline preform 3 is a spiral tube with a diameter of 14 mm.

[0132] The pipeline glue inlet preform 31 includes a first glue inlet pipe preform 311 and a second glue inlet pipe preform 312. The first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 are perpendicularly arranged, and the first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 are arranged on the center line of the cavity preform 1.

[0133] In this embodiment, the pipeline seal preform 32 includes a first seal pipe preform 321, a second seal pipe preform 322, and a third seal pipe preform 323.

[0134] The first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 have a diameter of 14 mm and a length of 480 mm. The first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 are fixed at the midline position of the opposite sides of the cavity preform 1 with spray glue and a semi-permeable membrane, and the intersection of the first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 is cut off and spliced.

[0135] The diameters of the first sealed tube preform 321, the second sealed tube preform 322, and the third sealed tube preform 323 are 14 mm. The first sealed tube preform 321 is fixed around the periphery of the cavity preform 1. The second sealed tube preform 322 is fixed around the periphery of the first sealed tube preform 321. The third sealed tube preform 323 is fixed around the periphery of the second sealed tube preform 322. The first sealed tube preform 321, the second sealed tube preform 322, and the third sealed tube preform 323 form three closed-loop pipeline sealing preforms 32.

[0136] The distance between the first sealed tube preform 321 and the cavity preform 1 is 10 mm; the distances between the second sealed tube preform 322 and the first sealed tube preform 321 and the third sealed tube preform 323 are 50 mm;

[0137] Communication preforms 5 are arranged between the four corners on the side of the cavity preform 1 and the first sealed tube preform 321; one ends of the four communication preforms 5 are placed on the polyester films at the four corners on the side of the cavity preform 1, and the other ends of the communication preforms 5 abut against the roots of the first sealed tube preform 321; the communication preforms 5 are cylindrical wooden sticks with a diameter of 3 mm and a length of 20 mm;

[0138] The baffle 4 is fixed around the periphery of the third sealed tube preform 323. The thickness of the baffle 4 is 4 mm, and the distance between the baffle 4 and the third sealed tube preform 323 is 60 mm.

[0139] Specifically, step S3 includes the following steps:

[0140] S31. Prepare the first silicone rubber and the second silicone rubber;

[0141] S32. Degas the first silicone rubber and the second silicone rubber;

[0142] S33. Form the vacuum sealing mechanism 10 and the glue inlet pipeline 12: Evenly apply the first silicone rubber on the surface of the pipeline glue inlet preform 31 until the first silicone rubber coating 13 completely covers the pipeline glue inlet preform 31 to form the glue inlet pipeline 12. Evenly apply the first silicone rubber on the surface of the pipeline sealing preform 32 until the first silicone rubber coating 13 completely covers the pipeline sealing preform 32 to form the vacuum sealing mechanism 10. The thickness of the first silicone rubber coating 13 ≥ 5 mm;

[0143] S34. Form the flow guiding path: Evenly coat the first silicone rubber on the surface of the flow guiding net 2 until the continuous film completely covers the flow guiding net 2 to form the flow guiding path. The thickness of the continuous film on the flow guiding net 2 is 0.5 - 1 mm;

[0144] S35. Forming of the pipe plug 9: Fix the sleeve 6 on the pipeline prefabricated part 3 with the first silicone rubber; Pour the second silicone rubber into the inside of the sleeve 6 from the upper opening of the sleeve 6, then insert the pipe plug prefabricated part 7 into the center of the sleeve 6, and cure it naturally at room temperature for 1 - 2 h to form the pipe plug 9.

[0145] Specifically, the pipe plug 9 includes a first pipe plug 91 and a second pipe plug 92.

[0146] The first pipe plug 91 is arranged at the intersection of the first glue inlet pipe prefabricated part 311 and the second glue inlet pipe prefabricated part 312.

[0147] The second pipe plugs 92 are arranged at the central positions of the pipeline sealing prefabricated parts 32 on the left and right sides of the cavity prefabricated part 1.

[0148] More specifically, in step S31, preparing the first silicone rubber and the second silicone rubber: The first silicone rubber includes a silicone rubber A component and a silicone rubber B component, and the mass ratio of the silicone rubber A component to the silicone rubber B component is 1:1. Store the weighed silicone rubber A component and silicone rubber B component in a clean container, stir and mix until the color is uniform.

[0149] More specifically, both the silicone rubber A component and the silicone rubber B component are room temperature condensation type vulcanized silicone rubbers, and the room temperature condensation type vulcanized silicone rubber is one of methyl room temperature vulcanized silicone rubber, methyl bisphenyl room temperature vulcanized silicone rubber, methyl block room temperature vulcanized silicone rubber, and fluorosilicone rubber.

[0150] More specifically, in step S31, following the preparation principle of small amounts and multiple times, the single - time preparation amount of the first silicone rubber is 2000 g, and a total of 6 times are prepared.

[0151] The first silicone rubber also includes a thickener. The components of the second silicone rubber are the same as those of the first silicone rubber. The difference between the second silicone rubber and the first silicone rubber lies only in the thickener, and the dosage of the thickener in the first silicone rubber is greater than that in the second silicone rubber.

[0152] More specifically, in step S32, performing vacuum degassing on the first silicone rubber and the second silicone rubber: Place the mixed first silicone rubber and second silicone rubber in a vacuum buffer tank respectively, close the air inlet valve, connect the air extraction valve to the vacuum, turn on the vacuum. When the vacuum degree reaches 0.090 MPa and above, maintain the vacuum state for 5 - 10 min, observe the bubbling situation of the silicone rubber through the observation window, release the pressure through the air inlet valve to prevent the silicone rubber bubbles from overflowing, and take it out after complete degassing.

[0153] More specifically, in step S33, a clean brush and a scraper are used to evenly apply the first silicone rubber on the surface of the pipeline glue inlet preform 31, brushing back and forth to avoid dripping and missed brushing, and try to ensure that the coating thickness is uniform. For every 1 mm thickness, 1 layer of reinforcing gauze is applied to the brushing area to increase the strength of the pipeline part after curing, until the first silicone rubber coating 13 completely covers the pipeline glue inlet preform 31 to form the glue inlet pipeline 12. The first silicone rubber is evenly applied on the surface of the pipeline sealing preform 32 until the first silicone rubber coating 13 completely covers the pipeline sealing preform 32 to form the vacuum sealing mechanism 10. The thickness of the first silicone rubber coating 13 is 5 mm.

[0154] More specifically, in step S33, more specifically, in step S33, the first silicone rubber is evenly applied on the surfaces of the first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 until the first silicone rubber coating 13 completely covers the first glue inlet pipe preform 311 and the second glue inlet pipe preform 312 to form the glue inlet pipeline 12. The first silicone rubber is evenly applied on the surface of the first sealing pipe preform 321 until the first silicone rubber coating 13 completely covers the first sealing pipe preform 321 to form the first vacuum sealing pipeline 101. The first silicone rubber is evenly applied on the surface of the second sealing pipe preform 322 until the first silicone rubber coating 13 completely covers the second sealing pipe preform 322 to form the second vacuum sealing pipeline 102. The first silicone rubber is evenly applied on the surface of the third sealing pipe preform 323 until the first silicone rubber coating 13 completely covers the third sealing pipe preform 323 to form the third vacuum sealing pipeline 103.

[0155] More specifically, the reinforcing gauze is a high-toughness degreased fiber cotton mesh cloth, and this setting can increase the strength of the pipeline part after curing.

[0156] More specifically, in step S34, forming the flow guiding passage: 250 g of the first silicone rubber is evenly coated on the surface of the flow guiding net 2 until the continuous film completely covers the flow guiding net 2. The thickness of the continuous film on the flow guiding net 2 is 1 mm.

[0157] In step S34, the first silicone rubber has poor flowability and will be blocked by the flow guiding net 2, thus forming a flow channel imprint.

[0158] More specifically, in step S35, 400 g of the first silicone rubber is used to fix the sleeve 6 vertically on the pipeline preform 3; 700 - 800 g of the second silicone rubber is poured into the sleeve 6 from the upper opening of the sleeve 6, and then the pipe plug preform 7 is vertically inserted into the sleeve 6 from top to bottom and fixed at the center of the sleeve 6 to ensure no slipping and no floating, and it is naturally cured at room temperature for 1 - 2 h.

[0159] As Figure 9 shown, the pipe plug preform 7 is a solid round pipe with a diameter of 6 mm.

[0160] As Figure 8 shown, the sleeve 6 is a hollow plastic pipe with an inner diameter of 30 mm and a height of 50 mm.

[0161] More specifically, in step S35, the sleeve 6 is vertically fixed on the pipeline prefabrication 3 using the first silicone rubber. After 20 min to 30 min, the second silicone rubber is poured into the inside of the sleeve 6 from the upper opening of the sleeve 6 to prevent the second silicone rubber from flowing out due to insufficient curing of the first silicone rubber.

[0162] Specifically, step S4 specifically includes:

[0163] In 5 times, each time 2000 g of the second silicone rubber is dispersedly poured in the area of the cavity prefabrication 1, the interval area between the pipeline seal prefabrication 32 and the cavity prefabrication 1, the area of the pipeline seal prefabrication 32, and the area between the pipeline seal prefabrication 32 and the baffle 4 to form a continuous second silicone rubber coating 14 with a thickness of 4 mm, and it is naturally cured at room temperature for 1 to 2 h. Through the natural flow of the second silicone rubber, it is connected with the previous pipeline forming part to form an integral body.

[0164] In step S4, after the silicone bag film body 11 is formed, the pipe plug 9 is subjected to secondary treatment.

[0165] The secondary treatment of the pipe plug 9 includes the following steps: removing the pipe plug prefabrication 7, using 200 g of the first silicone rubber to reinforce and thicken the root of the installation interface, and curing at 15 - 25 °C for 1 to 2 h.

[0166] Specifically, step S5 specifically includes the following steps:

[0167] After sufficient curing, wear clean disposable gloves, perform overall demolding on the silicone bag film, remove the cavity prefabrication 1, the diversion net 2, the pipeline prefabrication 3, the baffle 4, the connection prefabrication 5, the sleeve 6, and the pipe plug prefabrication 7, and use tools such as scissors to dredge the pipe plug 9 and the pipeline main body.

[0168] Step S6 specifically includes the following steps:

[0169] Perform silicone bag film encapsulation on the clean mold 8. After the pipeline connection is completed, turn on the vacuum pump. After the vacuum degree ≥ 0.094 MPa, close the vacuum pump valve and keep the pressure for 5 min.

[0170] If there is no pressure drop after keeping the pressure for 5 min, it is determined that the silicone bag film can meet the process requirements of vacuum-assisted forming.

[0171] Use the obtained silicone bag film to vacuum-assist in manufacturing a 500 mm × 500 mm × 5 mm fiberglass composite material board.

[0172] The reusable integrated vacuum self-sealing silicone bag film prepared by using the above-mentioned method for preparing a reusable integrated vacuum self-sealing silicone bag film, such as Figure 10 shown, the reusable integrated vacuum self-sealing silicone bag film includes a silicone bag film body 11 and a silicone bag film cavity 15. The silicone bag film cavity 15 is arranged at the lower end of the silicone bag film body 11. On one side of the silicone bag film body 11 close to the silicone bag film cavity 15, a feed pipeline 12 and a flow guiding passage are arranged. A vacuum sealing mechanism 10 is arranged on the silicone bag film body 11, and the vacuum sealing mechanism 10 is arranged around the silicone bag film cavity 15.

[0173] The vacuum sealing mechanism 10 includes a first vacuum sealing pipeline 101, a second vacuum sealing pipeline 102 and a third vacuum sealing pipeline 103.

[0174] A reusable integrated vacuum self-sealing silicone bag film and a preparation method thereof according to this embodiment are based on the suction cup principle. Through three sealing pipelines of the vacuum sealing mechanism 10, self-sealing of the silicone bag on the mold surface is realized under the action of vacuum. The flow guiding function is integrated on the silicone bag film by the method of engraving and forming, so as to solve the deficiencies of the existing silicone bag in the composite material forming process, eliminate the use of disposable consumables such as sealing tapes and flow guiding nets, further simplify the packaging operation, reduce the production cost, greatly improve the labor efficiency and the stability of the composite material forming process, and is a feasible forming scheme for silicone vacuum bag film composites. Especially for the production of some small-sized, flat and large-batch composite material products, it has strong practical significance.

[0175] Embodiment 2

[0176] In this embodiment, different from Embodiment 1, the humidity is 57%, the size of the silicone bag film with a cavity size of 1000mm×1000mm×10mm, the size of the cavity preform 1 is 1000mm×1000mm×10mm, the diameters of the first feed pipe preform 311 and the second feed pipe preform 312 are 14mm and the length is 980mm, the thickness of the baffle 4 is 5mm, and the distance between the baffle 4 and the third sealing pipe preform 323 is 80mm.

[0177] More specifically, in step S31, the preparation amount of the first silicone rubber per time is 3000g. More specifically, in step S35, 1000g of the first silicone rubber is used to fix the sleeve 6 in the vertical direction on the pipeline preform 3.

[0178] Specifically, step S4 specifically includes: dispersing and pouring 2000 g of the second silicone rubber in 8 times, each time forming a continuous silicone rubber film with a thickness of 5 mm in the area of the cavity preform 1, the interval area between the pipeline sealing preform 32 and the cavity preform 1, the area of the pipeline sealing preform 32, and the area between the pipeline sealing preform 32 and the baffle 4, and curing naturally at room temperature for 1 to 2 h.

[0179] The secondary treatment of the pipe plug 9 includes the following steps: removing the pipe plug preform 7, using 250 g of the first silicone rubber to reinforce and thicken the root of the installation interface, and curing at 15 - 25 °C for 1 to 2 h.

[0180] Using the prepared silica gel bag film to fabricate a 1000 mm × 1000 mm × 10 mm glass fiber composite material board by vacuum assistance.

[0181] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A method for preparing a reusable integrated vacuum self-sealing silicone bag film, characterized in that, The preparation method of the reusable integrated vacuum self-sealing silicone bag film comprises the steps: S1. Clean the surface of the mold (8); S2. Place the cavity preform (1), the flow guide net (2), the pipeline preform (3), the baffle (4) and the connection preform (5) on the mold (8). The pipeline preform (3) includes a pipeline glue inlet preform (31) and a pipeline seal preform (32); S3. Mold the vacuum sealing mechanism (10), the glue inlet pipeline (12), the flow guide passage and the pipe plug (9); S4. Mold the silicone bag film body (11); S5. Demold; S6. Conduct airtight inspection; Step S2 includes the following steps: S21. Place the cavity preform (1) on the upper surface of the mold (8), lay the polyester film flat on the surface of the cavity preform (1), and orthogonally lay two layers of flow guide nets (2) on the area corresponding to the cavity on the upper surface of the polyester film; S22. Place and fix the pipeline glue inlet preform (31) on the upper surface of the cavity preform (1), place and fix the pipeline seal preform (32) around the periphery of the cavity preform (1), set the baffle (4) around the periphery of the pipeline seal preform (32), and set the connection preform (5) between the pipeline seal preform (32) and the cavity preform (1); Step S3 includes the following steps: S31. Prepare the first silicone rubber and the second silicone rubber; S32. Conduct vacuum degassing on the first silicone rubber and the second silicone rubber; S33. Mold the vacuum sealing mechanism (10) and the glue inlet pipeline (12): evenly apply the first silicone rubber on the surface of the pipeline glue inlet preform (31) until the first silicone rubber coating (13) completely covers the pipeline glue inlet preform (31) to form the glue inlet pipeline (12), evenly apply the first silicone rubber on the surface of the pipeline seal preform (32) until the first silicone rubber coating (13) completely covers the pipeline seal preform (32) to form the vacuum sealing mechanism (10), and the thickness of the first silicone rubber coating (13) ≥ 5 mm; S34. Mold the flow guide passage: evenly coat the first silicone rubber on the surface of the flow guide net (2) until the continuous film completely covers the flow guide net (2) to form the flow guide passage, and the thickness of the continuous film on the flow guide net (2) is 0.5 - 1 mm; S35. Mold the pipe plug (9): fix the sleeve (6) on the pipeline preform (3) with the first silicone rubber; pour the second silicone rubber into the sleeve (6) from the upper opening of the sleeve (6), then insert the pipe plug preform (7) into the center of the sleeve (6), and naturally cure at room temperature for 1 - 2 h to form the pipe plug (9); Step S4 specifically includes the following steps: Disperse and pour the second silicone rubber in the area of the cavity preform (1), the interval area between the pipeline seal preform (32) and the cavity preform (1), the area of the pipeline seal preform (32), and the area between the pipeline seal preform (32) and the baffle (4) to form a continuous second silicone rubber coating (14) with a thickness of 3 - 6 mm, and naturally cure at room temperature for 2 - 12 h.

2. The method for preparing a reusable integrated vacuum self-sealing silicone bag film according to claim 1, characterized in that, Step S5 specifically includes the following steps: After sufficient curing, the silicone bag film is demolded as a whole, and the cavity preform (1), the flow guide net (2), the pipeline preform (3), the baffle (4), the communication preform (5), the sleeve (6) and the pipe plug preform (7) are removed, and the pipe plug (9) and the pipeline main body are dredged.

3. The method for preparing a reusable integrated vacuum self-sealing silicone bag film according to claim 1, characterized in that, Step S6 specifically includes the following steps: Perform silicone bag film encapsulation on the clean mold (8). After the pipeline connection is completed, turn on the vacuum pump. After the ultimate vacuum degree is ≥ 0.094 MPa, close the vacuum pump valve and keep the pressure for 5 minutes.

4. The method for preparing a reusable integrated vacuum self-sealing silicone bag film according to claim 1, characterized in that, The pipeline glue inlet preform (31) includes a first glue inlet pipe preform (311) and a second glue inlet pipe preform (312). The first glue inlet pipe preform (311) and the second glue inlet pipe preform (312) are vertically arranged, and the first glue inlet pipe preform (311) and the second glue inlet pipe preform (312) are arranged on the center line of the cavity preform (1).

5. The method for preparing a reusable integrated vacuum self-sealing silicone bag film according to claim 1, characterized in that, Step S31 specifically includes the following steps: The first silicone rubber includes a silicone rubber A component and a silicone rubber B component. The mass ratio of the silicone rubber A component to the silicone rubber B component is 1:

1. Store the weighed silicone rubber A component and silicone rubber B component in a clean container and stir and mix until the color is uniform. Both the silicone rubber A component and the silicone rubber B component are room temperature condensation vulcanized silicone rubbers, and the room temperature condensation vulcanized silicone rubber is one of methyl room temperature vulcanized silicone rubber, methyl bisphenyl room temperature vulcanized silicone rubber, methyl block room temperature vulcanized silicone rubber, and fluorosilicone rubber.

6. The method for preparing a reusable integrated vacuum self-sealing silicone bag film according to claim 5, characterized in that, The first silicone rubber further includes a thickener. The components of the second silicone rubber are the same as those of the first silicone rubber, and the dosage of the thickener of the first silicone rubber is greater than that of the thickener of the second silicone rubber.

7. A reusable integrated vacuum self-sealing silicone bag film, characterized in that, The reusable integrated vacuum self-sealing silicone bag film is prepared by using the preparation method of a reusable integrated vacuum self-sealing silicone bag film according to any one of claims 1 to 6. The reusable integrated vacuum self-sealing silicone bag film includes a silicone bag film body (11) and a silicone bag film cavity (15). The silicone bag film cavity (15) is arranged at the lower end of the silicone bag film body (11). An inlet pipeline (12) and a flow guide passage are arranged on one side of the silicone bag film body (11) close to the silicone bag film cavity (15). A vacuum sealing mechanism (10) is arranged on the silicone bag film body (11), and the vacuum sealing mechanism (10) is arranged around the silicone bag film cavity (15).

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