A self-healing waterproof membrane

Abstract

This invention provides a self-healing waterproof membrane, comprising a first adhesive layer, a polymer film layer, a second adhesive layer, and a waterproof bonding sand layer arranged sequentially. The self-healing waterproof membrane of this invention features a rational structural design. The waterproof bonding sand layer serves as a rigid waterproof layer on its own, forming a rigid-flexible self-healing waterproof structure together with the polymer film layer. This results in excellent waterproofing performance and has promising prospects for large-scale application.

Description

Technical Field

[0001] This utility model relates to the field of waterproof membrane technology, and in particular to a self-healing waterproof membrane. Background Technology

[0002] Waterproofing materials are an indispensable part of buildings and bridges, preventing rainwater, domestic water, groundwater, and moisture from eroding building materials and avoiding a decrease in structural strength and a shortened service life. Waterproofing materials can be divided into inorganic and organic types based on their composition. Organic waterproofing materials offer the best waterproofing effect and dominate the waterproofing field. Organic waterproofing materials can be broadly categorized into bitumen-based waterproof membranes, polymer waterproof membranes, and waterproof coatings.

[0003] CN110744882A discloses a method for preparing an asphalt-based waterproof membrane. The method uses slag as raw material, water glass as an alkaline activator, and carbon fiber cloth as a reinforcing material, and combines it with cement to prepare an inorganic cementitious material as a filler. The method also uses thermoplastic polyurethane-modified EVA resin and asphalt as raw materials to prepare an asphalt-based waterproof membrane. The carbon fiber filaments exhibit good high-temperature mechanical properties under oxygen-free conditions, with a melting point reaching approximately 4000℃. The alkaline activator can cause the glassy structure of the slag to dissociate and rearrange, generating hydrated calcium silicate gel and hydrated calcium aluminate, thus giving the prepared asphalt-based waterproof membrane good high-temperature resistance.

[0004] CN108274846A discloses a durable modified bitumen waterproof building membrane and its preparation method. The method involves mixing super-adsorption fibers with a penetrating crystallizing masterbatch and then contacting the mixture with a sizing agent to obtain composite fibers. These composite fibers are then added to bitumen and dispersed evenly to obtain a waterproof bitumen material. This material is then extruded and thermally bonded with a matrix material to obtain the durable modified bitumen waterproof building membrane. This method utilizes high-load-rate composite fibers to protect the penetrating crystallizing masterbatch from detachment. Furthermore, the penetrating crystallizing particles sink through the internal pores of the bitumen and bond with the cement matrix, resulting in high adhesion between the mineral particles and the membrane during use, thus ensuring the waterproof membrane's impermeability.

[0005] CN112900651A discloses a multi-layer composite waterproof membrane and its preparation method. The multi-layer composite waterproof membrane includes a pressure layer and a self-healing layer stacked on top of the pressure layer. The pressure layer comprises bentonite composite rubber and water-absorbing resin. The self-healing layer includes an encapsulating material and an encapsulated material. The encapsulated material includes a non-curing asphalt waterproofing material and penetrating crystalline waterproofing microcapsules. The penetrating crystalline waterproofing microcapsules have a core-shell structure, with the shell material being a water-soluble polymer and the core material being a cement-based waterproofing repair material. When water flows to the membrane, the pressure layer absorbs water and expands, compressing the self-healing layer. The adhesive material in the self-healing layer flows to the damaged area of ​​the membrane, sealing the gaps. Furthermore, the penetrating crystalline waterproofing microcapsules embedded in the self-healing layer can enter concrete cracks with the water flow, improving the waterproofing effect. After the pressure layer dehydrates, it shrinks back, avoiding continuous compression of the self-healing layer. Upon subsequent contact with water, it re-expands, giving the membrane a continuous healing ability.

[0006] However, the aforementioned waterproof membranes still have problems such as complex structure, high manufacturing cost, easy aging of the asphalt material, and need to further improve service life. Utility Model Content

[0007] In view of the problems existing in the prior art, this utility model provides a self-healing waterproof membrane, which uses a polymer film layer as the main waterproof layer, and sets a first adhesive layer and a second adhesive layer on both sides of the polymer film layer, and sets a waterproof bonding sand layer on the second adhesive layer. The waterproof bonding sand penetrates into the concrete to form a crystallized layer, realizing the self-repair of small defects in the concrete. At the same time, the waterproof bonding sand layer can form a rigid waterproof layer on its own. The self-healing waterproof membrane has a reasonable structural design, forming a rigid + flexible self-healing waterproof structure, which can effectively improve the waterproof effect and enhance the service life of the waterproof membrane.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] This utility model provides a self-healing waterproof membrane, which includes a first adhesive layer, a polymer film layer, a second adhesive layer, and a waterproof bonding sand layer arranged in sequence.

[0010] The first adhesive layer of the self-healing waterproof membrane described in this invention can be laid loosely or bonded to the substrate through a primer. The polymer membrane is a flexible waterproof material that provides strength to the membrane, such as tensile and tear resistance. The waterproof bonding sand layer is a waterproof bonding layer with penetrating crystallization function, which can stand alone as a rigid waterproof layer. Together with the polymer membrane layer, it forms a rigid and flexible double waterproof layer, significantly improving the service life of the waterproof membrane. It can form two layers of waterproofing in one construction, meeting national standards. After the waterproof bonding sand layer on the second adhesive layer comes into contact with the concrete, the activated components in the waterproof bonding sand layer diffuse and penetrate into the concrete to form a crystalline layer, which can achieve self-repair of minor defects in the concrete structure.

[0011] The colors of the second adhesive layer and the waterproof bonding sand layer in the self-healing waterproof membrane of this invention can be set to red or other colors.

[0012] Preferably, the first adhesive layer comprises a self-adhesive rubber modified asphalt adhesive layer.

[0013] This invention does not specifically limit the composition of the self-adhesive rubber modified asphalt adhesive layer; any existing self-adhesive rubber modified asphalt adhesive in the art can be used.

[0014] Preferably, the thickness of the self-adhesive rubber modified asphalt compound layer is 0.7 to 1.2 mm, for example, it can be 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 1.0 mm or 1.2 mm, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0015] Preferably, the thickness of the polymer film layer is 0.25 to 0.35 mm, for example, it can be 0.25 mm, 0.27 mm, 0.3 mm, 0.31 mm, 0.33 mm, 0.34 mm or 0.35 mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0016] Preferably, the number of polymer film layers is 2 to 8, for example, it can be 2, 3, 4, 5, 6, 7 or 8 layers, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0017] Preferably, the second adhesive layer comprises a non-asphalt-based self-adhesive layer.

[0018] This invention does not specifically limit the composition of the non-asphalt-based self-adhesive layer; any existing non-asphalt-based self-adhesive material in the art can be used.

[0019] Preferably, the thickness of the non-asphalt-based self-adhesive layer is 0.3 to 0.6 mm, for example, it can be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm or 0.6 mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0020] Preferably, the waterproof bonding sand layer comprises a penetrating crystalline waterproof bonding sand layer.

[0021] This invention does not specifically limit the composition of the penetrating crystalline waterproof bonding sand layer; any existing penetrating crystalline waterproof bonding sand in the field can be used.

[0022] Preferably, the sand particle size in the waterproof bonding sand layer is 0.5 to 1.5 mm, for example, it can be 0.5 mm, 0.7 mm, 0.9 mm, 1.0 mm, 1.2 mm, 1.4 mm or 1.5 mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0023] Preferably, the thickness of the waterproof adhesive sand layer is 0.2 to 2.0 mm, for example, it can be 0.2 mm, 0.25 mm, 0.3 mm, 0.5 mm, 1.0 mm, 1.5 mm or 2.0 mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0024] The preferred thickness of the waterproof bonding sand layer in this invention is 0.2 to 2.0 mm. This ensures that the activated components in the sufficient amount of waterproof bonding sand diffuse into the concrete to repair minor defects in the concrete structure. The waterproof bonding sand layer of a specific thickness forms a suitable rigid waterproof layer structure. It also ensures that the manufacturing cost of the waterproof membrane is low, the unit weight is light, and it is easy to transport and use.

[0025] The self-healing waterproof membrane provided by this utility model, when in use, has a waterproof bonding sand layer in contact with the concrete and a first adhesive layer in contact with other membranes, achieving excellent and efficient waterproofing. The storage temperature of the self-healing waterproof membrane should not exceed 45℃. During transportation, it should be protected from tilting or lateral pressure, and covered with a tarpaulin if necessary.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] The self-healing waterproof membrane provided by this utility model has a simple and reasonable structural design. After the waterproof bonding sand layer comes into contact with the concrete, it penetrates into the concrete to form a crystalline layer, realizing the self-repair of minor defects in the concrete. At the same time, the waterproof bonding sand layer forms a rigid waterproof layer on its own. Together with the polymer membrane layer, it forms a rigid + flexible self-healing waterproof structure, which can effectively improve the waterproof effect and enhance the service life of the waterproof membrane. It is suitable for widespread application in the construction field. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of the self-healing waterproof membrane in Embodiment 1 of this utility model.

[0029] Figure 2 This is a schematic diagram of the structure of the self-healing waterproof membrane in Embodiment 2 of this utility model.

[0030] In the diagram: 1-First adhesive layer; 2-Polymer film layer; 3-Second adhesive layer; 4-Waterproof bonding sand layer. Detailed Implementation

[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be determined by the claims.

[0033] It should be understood that in the description of this utility model, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Example 1

[0036] This embodiment provides a self-healing waterproof membrane, the structural diagram of which is shown below. Figure 1 As shown.

[0037] The self-healing waterproof membrane includes a first adhesive layer 1, a polymer film layer 2, a second adhesive layer 3, and a waterproof bonding sand layer 4 arranged sequentially.

[0038] The first adhesive layer 1 is a self-adhesive rubber modified asphalt adhesive layer. The thickness of the self-adhesive rubber modified asphalt adhesive layer is 1.0 mm.

[0039] The thickness of the polymer film layer 2 is 0.3 mm.

[0040] The polymer membrane layer 2 has 3 layers.

[0041] The second adhesive layer 3 is a non-asphalt-based self-adhesive layer. The thickness of the non-asphalt-based self-adhesive layer is 0.4 mm.

[0042] The waterproof bonding sand layer 4 is a penetrating crystalline waterproof bonding sand layer.

[0043] The sand particles in the waterproof bonding sand layer 4 have a diameter of 1.0 mm.

[0044] The thickness of the waterproof bonding sand layer 4 is 1.3 mm.

[0045] Example 2

[0046] This embodiment provides a self-healing waterproof membrane, the structural diagram of which is shown below. Figure 2 As shown.

[0047] The self-healing waterproof membrane includes a first adhesive layer 1, a polymer film layer 2, a second adhesive layer 3, and a waterproof bonding sand layer 4 arranged sequentially.

[0048] The first adhesive layer 1 is a self-adhesive rubber-modified asphalt adhesive layer. The thickness of the self-adhesive rubber-modified asphalt adhesive layer is 0.7 mm.

[0049] The thickness of the polymer film layer 2 is 0.35 mm.

[0050] The polymer membrane layer 2 has 5 layers.

[0051] The second adhesive layer 3 is a non-asphalt-based self-adhesive layer. The thickness of the non-asphalt-based self-adhesive layer is 0.3 mm.

[0052] The waterproof bonding sand layer 4 is a penetrating crystalline waterproof bonding sand layer.

[0053] The sand particles in the waterproof bonding sand layer 4 have a diameter of 1.5 mm.

[0054] The thickness of the waterproof bonding sand layer 4 is 2.0 mm.

[0055] Example 3

[0056] This embodiment provides a self-healing waterproof membrane, which includes a first adhesive layer, a polymer film layer, a second adhesive layer, and a waterproof bonding sand layer arranged sequentially.

[0057] The first adhesive layer is a self-adhesive rubber-modified asphalt adhesive layer. The thickness of the self-adhesive rubber-modified asphalt adhesive layer is 0.7 mm.

[0058] The thickness of the polymer film is 0.35 mm.

[0059] The polymer film has two layers.

[0060] The second adhesive layer is a non-asphalt-based self-adhesive layer. The thickness of the non-asphalt-based self-adhesive layer is 0.3 mm.

[0061] The waterproof bonding sand layer is a penetrating crystalline waterproof bonding sand layer.

[0062] The sand particles in the waterproof bonding sand layer have a diameter of 0.5 mm.

[0063] The thickness of the waterproof bonding sand layer is 1.8 mm.

[0064] Example 4

[0065] This embodiment provides a self-healing waterproof membrane, which includes a first adhesive layer, a polymer film layer, a second adhesive layer, and a waterproof bonding sand layer arranged sequentially.

[0066] The first adhesive layer is a self-adhesive rubber-modified asphalt adhesive layer. The thickness of the self-adhesive rubber-modified asphalt adhesive layer is 1.2 mm.

[0067] The thickness of the polymer film is 0.25 mm.

[0068] The polymer film has 8 layers.

[0069] The second adhesive layer is a non-asphalt-based self-adhesive layer. The thickness of the non-asphalt-based self-adhesive layer is 0.6 mm.

[0070] The waterproof bonding sand layer is a penetrating crystalline waterproof bonding sand layer.

[0071] The sand particles in the waterproof bonding sand layer have a diameter of 0.7 mm.

[0072] The thickness of the waterproof bonding sand layer is 0.8 mm.

[0073] Tensile properties and water resistance were tested on the self-healing waterproof membranes in Examples 1 to 4.

[0074] Five 220mm × 25mm (longitudinal × transverse) self-healing waterproof membrane samples were cut in both the longitudinal and transverse directions, and tensile properties were tested according to section 5.8.1 of GB / T 35467-2017. The results showed that the self-healing waterproof membranes in Examples 1-4 did not exhibit separation between the adhesive layer and the core material during tensile testing, and the elongation at break was ≥200%.

[0075] Three 100mm × 70mm (longitudinal × transverse) self-healing waterproof membrane sheets were cut and subjected to water resistance testing according to section 6 of T / CWA 302-2023. The results showed that the self-healing waterproof membrane sheets in Examples 1-4 exhibited no cracks, delamination, blistering, or breakage, and had a water absorption rate of ≤4%.

[0076] Example 5

[0077] This embodiment provides a self-healing waterproof membrane, which is the same as that in Embodiment 1 except that the thickness of the waterproof bonding sand layer is 0.1 mm.

[0078] In this embodiment, due to the small thickness of the waterproof bonding sand layer, there are fewer activating components that diffuse into the concrete and self-repair the concrete structure, resulting in a poor effect on self-repairing minor defects in the concrete structure. Moreover, the rigid waterproof layer formed by the waterproof bonding sand layer is relatively thin, which leads to a reduction in the waterproof performance of the self-healing waterproof membrane and a shortened service life.

[0079] Example 6

[0080] This embodiment provides a self-healing waterproof membrane, which is the same as that in Embodiment 1 except that the thickness of the waterproof bonding sand layer is 2.5mm.

[0081] In this embodiment, the greater thickness of the waterproof bonding sand layer increases the manufacturing cost of the self-healing waterproof membrane, and also increases the unit mass of the self-healing waterproof membrane, affecting subsequent transportation and use.

[0082] Comparative Example 1

[0083] This comparative example provides a waterproof membrane, which is identical to Example 1 except that it does not have a waterproof bonding sand layer.

[0084] Because this comparative example does not have a waterproof bonding sand layer, the second adhesive layer is in direct contact with the concrete and cannot form a rigid waterproof layer. As a result, the waterproof performance of the entire waterproof membrane is greatly reduced, and its service life is also greatly shortened.

[0085] In summary, the self-healing waterproof membrane structure provided by this utility model has a simple and reasonable design. The waterproof bonding sand layer forms a rigid waterproof layer, which together with the polymer membrane layer forms a rigid + flexible self-healing waterproof structure with excellent waterproof effect and has the prospect of large-scale promotion and application.

[0086] The applicant declares that the detailed structural features of this utility model are illustrated through the above embodiments, but this utility model is not limited to the above detailed structural features, that is, it does not mean that this utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to this utility model, equivalent substitutions of selected components, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this utility model.

[0087] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A self-repairing waterproofing membrane, characterized in that, The self-healing waterproof membrane comprises a first adhesive layer, a polymer film layer, a second adhesive layer, and a waterproof bonding sand layer arranged sequentially.

2. The self-healing waterproofing membrane of claim 1, wherein, The first adhesive layer includes a self-adhesive rubber modified asphalt adhesive layer.

3. The self-healing waterproofing membrane of claim 2, wherein, The thickness of the self-adhesive rubber-modified asphalt compound layer is 0.7–1.2 mm.

4. The self-healing waterproofing membrane of claim 1, wherein, The thickness of the polymer film is 0.25–0.35 mm.

5. The self-healing waterproofing membrane of claim 1, wherein, The polymer film has 2 to 8 layers.

6. The self-healing waterproofing membrane of claim 1, wherein, The second adhesive layer includes a non-asphalt-based self-adhesive layer.

7. The self-healing waterproof membrane according to claim 6, characterized in that, The thickness of the non-asphalt-based self-adhesive layer is 0.3–0.6 mm.

8. The self-healing waterproofing membrane of claim 1, wherein, The waterproof bonding sand layer includes a penetrating crystalline waterproof bonding sand layer.

9. The self-healing waterproofing membrane of claim 1, wherein, The sand particle size in the waterproof bonding sand layer is 0.5 to 1.5 mm.

10. The self-healing waterproofing membrane of claim 1, wherein, The thickness of the waterproof bonding sand layer is 0.2 to 2.0 mm.

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