Expandable moisture-activated sealing element

Abstract

A sealing element having elastic expansibility when absorbing moisture, designed to effectively seal holes drilled into roofs, terraces and walls, for securing objects to prevent permeation of building materials or buildings themselves by moisture or moisture. The invention relates to a composite hydrophilic expandable TPE (thermoplastic elastomer) made of a hydrophilic expandable material, such as bentonite, or a composite hydrophilic expandable TPE mixed with a composite material having elastic properties. The sealing element is produced by melting and mixing a hydrophilic expandable material and a composite material with an elastic property for mold injection molding, or injection molding a plastic material to form a plug, and then injection molding a composite material containing the hydrophilic expandable material.

Description

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202580006108.8 (22) Application Date 2025.06.02 (30) Priority Data 24217280.7 2024.12.03 EP 25162997.8 2025.03.11 EP 20240100410 2024.06.03 GR (85) PCT International Application Entering National Phase Date 2026.05.19 (86) PCT International Application Application Data PCT / EP2025 / 065209 2025.06.02 (87) PCT International Application Publication Data WO2025 / 252676 EN 2025.12.11 (71) Applicant: Vasilios Tilpass Address: Saroneda, Greece (72) Inventors: Vasilios Tilpass, Michael Tilpass (74) Patent Agency: Beijing Beixin Zhicheng Intellectual Property Agency Co., Ltd. 11100 Patent Attorneys: Zhang Jing, Zhou Jiaxin (51) Int.Cl. F16B 13 / 00 (2006.01) F16B 43 / 00 (2006.01) (54) Invention Title: Expandable Humidity-Activated Sealing Element (57) Abstract: A sealing element that expands elastically when absorbing moisture is designed to effectively seal holes drilled into roofs, terraces, and walls for securing objects to prevent moisture or water penetration into building materials or the building itself. It is made of a hydrophilic expandable material, such as bentonite, or a composite hydrophilic expandable TPE mixed with a composite material having elastic properties. The sealing element is produced by injection molding a mold by melt-mixing a hydrophilic expandable material with a composite material having elastic properties, or by first injection molding a plastic material to form a plug, and then injection molding a composite material containing the hydrophilic expandable material. Claims 1 page, Description 5 pages, Drawings 4 pages, Claims amended according to Article 19 of the Treaty 1 page CN 122228399 A 2026.06.16 CN 1 22 22 83 99 A 1. A sealing element (1, 11) for sealing a hole (6) in a plate (9) for fixing an object on the plate, characterized in that: it comprises a composite hydrophilic expandable material. 2. The sealing element (1, 11) according to claim 1, characterized in that: it is cylindrical. 3. The sealing element (1, 11) according to claim 1, characterized in that: it is conical or truncated conical. 4. The sealing element (1, 11) according to claims 1 to 3, characterized in that: it comprises elongated protrusions.5. The sealing element (1, 11) according to claims 1 to 3, characterized in that it comprises at least one circumferential flange. 6. The sealing element (1, 11) according to claims 1 to 5, characterized in that it comprises a lip (2a, 2b). 7. The sealing element (1, 11) according to claims 1 to 6, characterized in that the composite hydrophilic expandable material comprises expandable hydrophilic particles of bentonite or sodium polyacrylate. 8. The sealing element (1, 11) according to claims 1 to 7, characterized in that it is in the form of a universal plastic anchor (5, 51). 9. The sealing element (1, 11) according to claims 1 to 7, characterized in that it comprises a universal plastic anchor (5) or a universal metal anchor, and an outer layer made of the composite hydrophilic expandable material applied to the universal plastic anchor (5) or universal metal anchor. 10. A method for producing the sealing element (1, 11) according to claims 1 to 8, characterized in that it comprises the step of: injection molding a molten mixture of a composite hydrophilic expandable material. 11. The method for producing the sealing element (1, 11) according to claim 10, characterized in that: continuous injection molding comprises first injection molding a plastic material to form a plug (5), and then injection molding a composite hydrophilic expandable material having hydrophilic expandable properties. 12. The method for producing the sealing element (1, 11) according to claim 11, characterized in that: the composite hydrophilic expandable material is applied to at least a portion of a general-purpose plastic anchor. 13. The method for producing the sealing element (1, 11) according to claim 12, characterized in that: the composite hydrophilic expandable material is applied to the outer portion of the general-purpose plastic anchor by injection molding, covering at least a portion of the inner surface of the general-purpose plastic anchor (51) on the outer surface of the general-purpose plastic anchor and through a hole (52). 14. The method for producing sealing elements (1, 11) according to claim 13, characterized in that: the application of the composite hydrophilic expandable material is performed by: injection molding the composite hydrophilic expandable material onto at least a portion of the general-purpose plastic anchor, or spraying the composite hydrophilic expandable material onto at least a portion of the general-purpose plastic anchor, or immersing at least a portion of the general-purpose plastic anchor in the composite hydrophilic expandable material. 15. The use of the sealing elements (1, 11) according to claims 1 to 9, which are used to seal holes (6) opened on the surface of a plate (9) to resist water or moisture.Claims 1 / 1 Page 2 CN 122228399 A Expandable Humidity-Activated Sealing Element Technical Field

[0001] This disclosure relates to sealing devices for holes in building structures, and more particularly to an expandable sealing element, a method of manufacturing the same, and a method of sealing holes drilled in sheet metal or other building elements using the sealing element. Background Art

[0002] In building structures, sealing holes is critical for construction and maintenance, particularly roofs, terraces, and walls. These holes are typically necessary for securing various fixtures such as insulation materials, antennas, air conditioning units, solar panels, railings, and other equipment. However, these holes also create potential vulnerabilities for moisture penetration, which can lead to significant structural damage over time.

[0003] Traditionally, methods for sealing such holes typically involve applying silicone, tar, or other sealants around and over the fasteners used to secure the fixtures. These methods are designed to create a barrier to prevent water from entering the borehole and potentially damaging the underlying structure. However, these conventional sealing techniques are costly in terms of manpower and material usage and are often insufficient to cope with challenging environmental conditions.

[0004] Furthermore, the effectiveness of conventional sealants is affected by a variety of factors. Extreme temperature fluctuations and prolonged exposure to ultraviolet radiation can cause the material to expand and contract, potentially creating cracks and gaps in the sealant and reducing its effectiveness over time. Additionally, water accumulation (especially on flat roofs or terraces) can test the limits of these sealing methods. Therefore, moisture penetration remains a persistent problem, leading to concrete deterioration, steel corrosion, and increased humidity within the building structure.

[0005] Another challenge of conventional sealing methods is their lack of adaptability. Once applied, these sealants typically remain stationary, making changes such as antenna relocation difficult, and their response to changes in environmental conditions or structural movement is problematic. This stationary nature can lead to seal failure, particularly in structures affected by settlement or areas with significant temperature variations.

[0006] Therefore, the related art requires a dynamically responsive sealing solution to overcome at least one of the aforementioned problems. Summary of the Invention

[0007] The sealing element of the present invention is hydrophilic and expandable, meaning that it can elastically expand or swell when it absorbs moisture. The sealing element of this invention is designed to seal holes drilled in roofs, terraces, and walls to prevent moisture or water penetration into the building structure or the building itself. It is made of an innovative composite material that expands upon contact with water. Due to its lack of exposure to sunlight, it has a long service life and excellent durability. It is also designed to withstand high compressive forces.

[0008] This expandable sealing element can also be used in automotive applications to seal the housings of electrical components, as many electrical components are exposed to moisture and temperature fluctuations. In the marine industry, the sealing element can be used for waterproofing boats and ship deck fittings.In the aerospace industry, this expandable sealing element can be used to seal fasteners on aircraft panels. Aircraft are exposed to extreme temperature variations and humidity conditions at different altitudes. By integrating a sealing element around the panel fasteners, manufacturers can make aircraft more resistant to water intrusion and the potential water corrosion problems that result.

[0009] The hydrophilic expandable material in the sealing element can be bentonite or contain bentonite. Using bentonite as a hydrophilic material takes advantage of its ability to naturally absorb water and expand. Bentonite is a natural clay composed primarily of montmorillonite minerals, typically formed from the decomposition of volcanic ash or tuff. Bentonite can shrink or expand significantly when water is removed or added. When bentonite absorbs water, it expands to about 100% of its original volume and shrinks to about 50% of its volume when water is removed. Specification 1 / 5 pages 3 CN 122228399 A

[0010] Alternatively, the hydrophilic expandable material in the sealing element can be a composite material. The use of composite hydrophilic expandable materials allows for greater control over the expansion performance of sealing elements, providing improved performance under specific environmental conditions or applications, such as higher UV resistance, temperature variation resistance, and so on. This composite material can expand from 50% to up to 1000% of its original volume. Technicians will choose materials with low water absorption expansion rates when the substrate is soft, weak, or even brittle and prone to deformation or cracking, and materials with high water absorption expansion rates when the substrate is strong and not easily altered. Materials commonly used in this application are TPE, EPDM, PVC, PU, ​​or any other thermoplastic elastomer containing expandable hydrophilic particles (such as sodium polyacrylate (ACR, ASAP, or PAAS)), the sodium salt of polyacrylic acid, with the chemical formula [-CH2-CH(CO2Na)]n. The "expansion rate," "water absorption expansion rate," or "water absorption expansion ratio" of the above polymers ranges from 100% to 1000%.

[0011] The water absorption expansion ratio is calculated according to the following formula: Expansion rate (%) = ((Awet - Adry) / Adry) × 100 where Adry and Awet are the areas of the dry and wet samples, respectively.

[0012] According to a preferred embodiment of the invention, the sealing element also has a lip at the top that covers the periphery of the hole, holding the sealing element in a stable position when the screw is tightened. The tightening screw passes through the sealing element and is then anchored to a plug that may have been placed in the hole.

[0013] Alternatively, an expandable sealing element may be provided near the hole entrance before or after the threaded rod is inserted into the hole containing chemical anchoring adhesive. The chemical anchoring adhesive holds the threaded rod in a stable position, and then the bolt of the threaded rod is tightened at the other free end, so that the sealing element effectively seals the opening.

[0014] In addition, the expandable sealing element is placed near the entrance of a wall through-hole for a wire rope or cable to pass through.

[0015] The sealing element of the present invention can be manufactured for any aperture and can have different shapes, forms, and sizes, and can be customized to fit the anchor point for a perfect seal in construction. Preferably, the sealing element can be cylindrical and form a ring (with an opening in the middle), with various thicknesses, diameters, and lengths. It can also be conical for easy insertion into the hole, or have a truncated conical form.

[0016] The sealing element of the present invention can be a stand-alone component in the form of a Universal Plastic Anchor (UPA), or a simplified form of a UPA. It can also be a metal anchor when greater stability and resistance to greater forces are required. Making the sealing element in the form of a UPA integrates new sealing functionality with familiar and widely used anchors, simplifies the installation process, and enhances compatibility with existing construction projects.

[0017] The method of manufacturing the sealing element of the present invention involves a one-time injection molding of a melt mixture of a hydrophilic expandable material and a compatible synthetic material (such as rubber). This production method ensures that the hydrophilic expandable and elastic material is uniformly distributed in the sealing element, thereby achieving consistent performance and reliable sealing performance.

[0018] Another method of manufacturing a sealing element involves first injection molding a plastic material to form a UPA, and then injection molding, spraying, or impregnating a hydrophilic expandable material onto the entire UPA or at least a portion thereof. Preferably, to optimize the use of the hydrophilic expandable element, the material is applied only to the “outer portion” of the plug, i.e., the portion near the hole opening when the plug is positioned and ready to receive a screw. This subsequently added hydrophilic expandable material may comprise natural materials such as bentonite, or composite materials comprising hydrophilic expandable materials with elastic properties, or any suitable combination thereof.

[0019] This two-step injection molding process allows for the creation of elements with different layers, providing enhanced structural integrity or specialized functionality at different portions of the sealing element.

[0020] If a metal anchor is used, the same process is performed: a layer of hydrophilic expandable material is applied to the entire surface of the anchor bolt, or only to the inner and outer surfaces of the outer portion of the anchor bolt. The outer portion of the anchor bolt is the portion that enters the hole last and is close to the plate surface.

[0021] The application of this sealing element addresses the urgent need for effective waterproofing in buildings, particularly in scenarios where structures or devices must be secured to roofs, walls, or other building surfaces to prevent moisture penetration and associated structural damage.

[0022] In the following text, several terms are used: “hydrophilic” refers to a material that not only absorbs moisture but also expands in volume upon absorbing moisture.

[0023] “expandable” and “swellable” should be considered synonyms.

[0024] “universal plastic anchor”, “UPA”, and “plug” should be considered synonyms. Brief Description of the Drawings

[0025] Embodiments of the invention will be described by way of example with reference to the following drawings: Figure 1 shows three different versions of the sealing element.

[0026] Figure 2 shows a cross-sectional view of a sealing assembly with a plug.

[0027] Figure 3 shows a cross-sectional view of a sealing assembly with chemical anchoring adhesive.

[0028] Figure 4 shows a cross-sectional view of a separate assembly with a sealing element.

[0029] Figure 5 shows a cross-sectional view of a wall fitted with a sealing element.

[0030] Figure 6 shows a cross-sectional view of a separate assembly with an integrated sealing element. Detailed Description

[0031] Figures 1a, 1b, and 1c show three different versions of the sealing element, wherein Figure 1a shows a perspective view of a basic sealing element, Figure 1b shows a perspective view of a sealing element with a square or rectangular lip, and Figure 1c shows a perspective view of a device with a circular lip.

[0032] According to a basic embodiment of the invention (as shown in Figure 1a), the sealing element 1 is cylindrical. Despite its simplicity, when placed in the correct position, the cylindrical body of the sealing element 1 effectively seals the borehole, preventing moisture penetration and potential damage to the building structure.

[0033] According to another embodiment of the invention (as shown in Figures 1b and 1c), the sealing element 1 also has lips 2a, 2b (Figures 1b, 1c) at the top, which prevent the sealing element 1 from further entering the hole when the sealing element is placed in the hole, while covering a larger area outside the periphery of the hole 6, keeping the sealing element 1 in a stable position when the plug and screw are fixed. The lip can be circular (Figure 1c) and have a perforated disc shape, or rectangular (Figure 1b) with a hole in its central area, or other suitable shapes. In this form, the sealing element is designed to cover a larger area around the drilled hole when the sealing element is installed, providing additional sealing surface and stability of the sealing element position. Preferably, the lips 2a, 2b (Figures 1b, 1c) are made of the same material as the cylindrical body, so that they can also expand when in contact with water and contract when the water evaporates.

[0034] Figure 2 shows the most common use of the invention, in which a hole 6 is drilled in concrete or other slab 9, a known type of plug 5 (such as a general-purpose plastic or metal anchor) is placed deep within the hole 6, a sealing element 1 is placed at the opening of the hole 6, optionally with its lips 2a, 2b extending beyond the periphery of the hole, insulation material 8 or a metal plate 8 is placed on top of the sealing element 1, and finally a known type of screw, such as a fastening screw, comprising a screw head 4 and a screw 3, is screwed in. The screw passes through the sealing element 1 and is then anchored to the plug 5 (such as the general-purpose plastic or metal anchor) that may have been placed in the hole 6. A conventional metal element 7 may be placed between the top layer of insulation material 8 or metal plate 8 and the screw head 4 to better secure the screw. Due to its property of expanding upon contact with water, the sealing element 1 will cover any gaps that are present or created by potential expansion, contraction, or vibration in the structure.After expansion, once the water in the area evaporates, the sealing element 1 will return to its original form without losing its ability to expand again when water or humidity reappears.

[0035] Figure 3 shows another method of sealing the hole 6, in which the threaded rod 31 is placed in the hole 6 containing chemical anchoring adhesive. The sealing element 1 (optionally with lip 2 - specifically lip 2a or 2b as shown in Figures 1b and 1c) is first placed on top of the hole 6, and then the threaded rod 31 is inserted into the middle of the hole 6. The hole 6 already contains chemical anchoring adhesive 10, which surrounds the threaded rod 31 and securely fixes the threaded rod 31 after drying. Technicians can first place chemical anchoring adhesive 10 in hole 6, then insert threaded rod 31. After the chemical anchoring adhesive 10 dries, add sealing element 1 (optionally with lip 2 - specifically lip 2a or 2b shown in Figures 1b and 1c), then place top layer insulation material 8 or metal plate 8, conventional metal element 7 (such as metal ring), and finally tighten bolt 41 of threaded rod 31.

[0036] Figure 4 shows a further embodiment of the invention, wherein the independent component, in the form of a plug, comprises a conventional plug and a sealing element. The plug consists of two embedded parts, the first part 51 being a conventional plug, such as a general-purpose plastic anchor, typically made of polypropylene, polyethylene, nylon or other plastic materials, and having a known form (not shown in detail in Figure 4), and the second part 11 being the sealing element of the invention.

[0037] This independent component can be produced by continuous injection molding, first injection molding the conventional plug of the first part 51, and then injection molding the sealing element of the second part 11. This independent component is easy to manufacture in a single mold, combining the advantages of conventional plugs (e.g., general-purpose plastic anchors) that can securely fasten screws to walls or plates with the advantage of using a sealing element made of a hydrophilic, expandable material to seal the opening of hole 6.

[0038] Furthermore, according to a variation of the foregoing embodiment in FIG. 4, the plug 5 is a conventional plug made of nylon, polyethylene, or metal, the outer portion of which is surrounded by the sealing element of the present invention, which is processed after the plug is manufactured.

[0039] Alternatively, the sealing element may take the form of another independent plug, which is a separate component made by co-injection molding or simultaneous injection molding of two different materials (pre-mixed or mixed during injection molding). The first material is a hydrophilic, expandable material as described above, and the second material is a composite material with elastic properties. The final product takes the shape of the mold design. This co-injection molding method is achieved using a plastic elastomer production machine, which has a lower cost for the final product (plug) due to its high production capacity.

[0040] Furthermore, according to a further variation of the aforementioned embodiment of FIG. 4 (as shown in FIG. 5 and FIG. 6), the conventional plug of the first part 51 is a common plug made of nylon or polyethylene or even metal, the outer portion of which (i.e., the portion near the opening of the hole 6 after the plug is fully inserted into the hole 6) contains openings or holes 52 of appropriate shape, size, and number to allow subsequent application of a liquid composite material and to allow the composite material to permeate from one side to the other (to form the sealing element of the second part 11).

[0041] After the first injection molding of the plastic material used to manufacture the conventional plug (such as a general plastic anchor), a second application of a hydrophilic expandable material is then performed, which is applied only to the outer portion of the plug. The application of the composite material (i.e., the aforementioned hydrophilic expandable material in liquid form) can be accomplished by conventional injection molding. The openings or holes 52 appropriately provided on the outer portion of the plug allow the hydrophilic material to permeate from one part of the injection-molded material (most often the outer surface of the plug) to another part (in this example, the inner surface).

[0042] Alternatively, the liquid composite hydrophilic expandable material can be sprayed onto a general-purpose plastic or metal anchor, while another method is to partially immerse the outer portion of the plug 5 in the liquid composite hydrophilic expandable material.

[0043] These manufacturing methods produce a plug that possesses all the characteristics of a conventional plug, such as rigidity upon hammering into the orifice, and also includes a built-in sealing element that expands upon absorbing moisture and provides an airtight seal to the orifice, preventing water or moisture penetration.

[0044] The sealing element 1 of this disclosure, or a freestanding plug of a variant thereof, may include a flange or flange as well as elongated protrusions and grooves to accommodate a wider range of orifice diameters and stabilize the plug's position within the orifice when a screw is inserted.

[0045] The sealing element of the present invention is made of a hydrophilic expandable material that expands upon contact with water, which may optionally be mixed with a plastic material having elastic properties. According to one embodiment of the invention, the hydrophilic expandable material is a natural material such as bentonite (see page 4 / 5 of CN 122228399 A), which can be mixed with an elastic material (such as an elastomer) to form a sealing element (or the second part 11).

[0046] The sealing element may alternatively be made of an artificially manufactured composite material containing a hydrophilic expandable material and an elastic material, such as a thermoplastic elastomer (TPE). Thus, the final product possesses both hydrophilic expandability and elasticity.

[0047] The sealing element of the present invention has a long service life and durability because it is essentially placed inside the hole and therefore not exposed to sunlight. It is also designed to withstand high compressive forces.Instruction manual 5 / 5 page 7 CN 122228399 A Figure 1a Figure 1b Figure 1c Instruction manual drawing 1 / 4 page 8 CN 122228399 A Figure 2 Figure 3 Instruction manual drawing 2 / 4 page 9 CN 122228399 A Figure 4 Figure 5 Instruction manual drawing 3 / 4 page 10 CN 122228399 A Figure 6 Instruction manual drawing 4 / 4 page 11 CN 122228399 A 1. A sealing element (11) for sealing a hole (6) for fixing an object on a plate (9), comprising a composite hydrophilic expandable material, characterized in that: it has the form of a universal plastic anchor (5, 51), a simplified form of a universal plastic anchor, a form of a metal anchor, or comprises a universal plastic anchor or a universal metal anchor (5) and an outer layer and an inner layer made of the composite hydrophilic expandable material applied to the universal plastic anchor or the universal metal anchor. 2. The sealing element (11) according to claim 1, characterized in that it is cylindrical. 3. The sealing element (11) according to claim 1, characterized in that it is conical or truncated conical. 4. The sealing element (11) according to claims 1 to 3, characterized in that it comprises elongated protrusions. 5. The sealing element (11) according to claims 1 to 3, characterized in that it comprises at least one circumferential flange. 6. The sealing element (11) according to claims 1 to 5, characterized in that it comprises lips (2a, 2b). 7. The sealing element (11) according to claims 1 to 6, characterized in that the composite hydrophilic expandable material comprises bentonite, or the composite hydrophilic expandable material is a composite material, particularly TPE, EPDM, PVC, PU, ​​or any other thermoplastic elastomer containing expandable hydrophilic particles, particularly sodium polyacrylate. 8. A method for producing the sealing element (11) according to claims 1 to 7, characterized in that: continuous mold injection, comprising first injection molding a plastic material to form a plug (5), and then injection molding a composite hydrophilic expandable material having hydrophilic expandable properties. 9. A method for producing the sealing element (11) according to claims 1 to 7, characterized in that: the composite hydrophilic expandable material is applied to at least a portion of a general-purpose plastic anchor or general-purpose metal anchor (5). 10. A method for producing the sealing element (11) according to claim 9, characterized in that: the composite hydrophilic expandable material is applied to the outer portion of the general-purpose plastic anchor or general-purpose metal anchor and passes through a hole (52) to cover at least a portion of the inner surface of the general-purpose plastic anchor or general-purpose metal anchor.11. The method for producing a sealing element (11) according to claim 10, characterized in that: the application of the composite hydrophilic expandable material is performed by: injection molding the composite hydrophilic expandable material onto at least a portion of the general-purpose plastic anchor or general-purpose metal anchor, or spraying the composite hydrophilic expandable material onto at least a portion of the general-purpose plastic anchor or general-purpose metal anchor, or immersing at least a portion of the general-purpose plastic anchor or general-purpose metal anchor in the composite hydrophilic expandable material. 12. A method for producing a sealing element (11) according to claims 1-7, wherein the sealing element (11) is in the form of a general-purpose plastic anchor (5, 51) or a simplified form of a general-purpose plastic anchor, characterized in that: the sealing element is made by co-injection molding or simultaneous injection molding of two different materials premixed or mixed during injection molding, the first material being a hydrophilic expandable material and the second material being a composite material with elastic properties. 13. Use of the sealing element (11) according to claims 1 to 7, which is used to seal holes (6) opened on the surface of the plate (9) to resist water or moisture. Claims amended according to Article 19 of the Treaty, page 1 / 1, CN 122228399 A.

Claims

1. A sealing element (1, 11) for sealing a hole (6) in a plate (9) for fixing an object to the plate, characterized in that: It contains composite hydrophilic expandable materials.

2. The sealing element (1, 11) according to claim 1, characterized in that: It is cylindrical.

3. The sealing element (1, 11) according to claim 1, characterized in that: It is conical or truncated conical.

4. The sealing element (1, 11) according to claims 1 to 3, characterized in that: It contains elongated protrusions.

5. The sealing element (1, 11) according to claims 1 to 3, characterized in that: It contains at least one circumferential flange.

6. The sealing element (1, 11) according to claims 1 to 5, characterized in that: It includes the lip area (2a, 2b).

7. The sealing element (1, 11) according to claims 1 to 6, characterized in that: The composite hydrophilic expandable material comprises expandable hydrophilic particles of bentonite or sodium polyacrylate.

8. The sealing element (1, 11) according to claims 1 to 7, characterized in that: It is available in the form of a general-purpose plastic anchor (5, 51).

9. The sealing element (1, 11) according to claims 1 to 7, characterized in that: It comprises a universal plastic anchor (5) or a universal metal anchor, and an outer layer made of the composite hydrophilic expandable material applied to the universal plastic anchor (5) or the universal metal anchor.

10. A method for producing the sealing element (1, 11) according to claims 1 to 8, characterized in that... The process includes the following steps: injection molding a molten mixture of composite hydrophilic expandable materials.

11. The method for producing the sealing elements (1, 11) according to claim 10, characterized in that: Continuous mold injection, including first injection molding of plastic material to form a plug (5), and then injection molding of a composite hydrophilic expandable material with hydrophilic expandable properties.

12. The method for producing sealing elements (1, 11) according to claim 11, characterized in that: A composite hydrophilic expandable material is applied to at least a portion of a general-purpose plastic anchor.

13. The method for producing sealing elements (1, 11) according to claim 12, characterized in that: The composite hydrophilic expandable material is applied to the outer portion of the general plastic anchor by injection molding through a mold, covering at least a portion of the inner surface of the general plastic anchor (51) on the outer surface of the general plastic anchor and through the hole (52).

14. The method for producing sealing elements (1, 11) according to claim 13, characterized in that: The application of the composite hydrophilic expandable material is carried out in the following manner: The composite hydrophilic expandable material is injection molded onto at least a portion of the general-purpose plastic anchor, or The composite hydrophilic expandable material is sprayed onto at least a portion of the general-purpose plastic anchor, or At least a portion of the general-purpose plastic anchor is immersed in the composite hydrophilic expandable material.

15. Use of the sealing element (1, 11) according to claims 1 to 9, which is used to seal holes (6) opened on the surface of the plate (9) to resist water or moisture.

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