Preparation method of water-meet-curing anti-sticking waterproof cushion

Abstract

A method for preparing a water-curing, reverse-adhesive waterproof backing includes the following steps: S1, laying a permeable layer, which is a 3D three-dimensional mesh fiber fabric; S2, filling the curing layer by filling the mesh of the permeable layer with a cement mixture, which includes cement, aggregate, and a coagulant; S3, covering the reverse-adhesive layer by covering the surface of the permeable layer with reactive sand, a reactive coating, or a water-soluble film to form the reverse-adhesive layer; S4, covering the healing layer by applying adhesive to the surface of the reverse-adhesive layer to form the healing layer; S5, covering the waterproof layer by covering the surface of the healing layer with a waterproof material to form the waterproof layer; S6, puncture and sew by using needle puncture technology to sew the permeable layer, cement mixture, reverse-adhesive layer, healing layer, and waterproof layer together to form an integral structure. This method innovatively adopts an integral needle puncture technique, which increases the adhesion and strength between the layers and ensures that the backing does not fall off.

Description

Technical Field

[0001] This invention relates to the field of geosynthetic materials technology, specifically to a method for preparing a water-curable, reverse-adhesive waterproof pad. Background Technology

[0002] Concrete waterproofing layers are characterized by simple and quick construction, high strength, and long service life, and have been widely used in projects such as ditches, slope protection, ponds, reservoirs, wetlands, and temporary roads.

[0003] The structure of concrete waterproofing pads is relatively simple. Generally, a cement mixture in the middle is needle-punched in advance to form a whole, and then an impermeable geomembrane is pasted on the bottom. For example, the patent with patent number CN201720445866.2, entitled "A Three-Dimensional Cement-Based Geocomposite Waterproof Pad", discloses such a waterproof pad. First, the cement mixture is needle-punched and compounded with the front and back geotextiles into a whole, and then the waterproof geomembrane is bonded by hot melt adhesive.

[0004] However, this type of waterproof mat has the following problems:

[0005] (1) The adhesive process has certain shortcomings. If the concrete waterproofing layer is always in water or in a humid environment, the adhesive will become less sticky, which will cause the backing of the underlying structure to fall off, affecting the service life and performance of the product.

[0006] (2) Since cement cannot completely prevent water seepage after it has hardened, once the geomembrane falls off again, the underlying structure cannot achieve complete seepage prevention. Summary of the Invention

[0007] To address the technical problems mentioned above, this invention provides a method for preparing a water-curable, anti-adhesive waterproofing layer, achieving a perfect combination of rigid and flexible waterproofing.

[0008] The technical solution of this invention is as follows:

[0009] A method for preparing a water-curing, reverse-adhesive waterproof pad, comprising the following steps:

[0010] S1. Lay out a permeation layer, which is a 3D three-dimensional mesh fiber fabric;

[0011] It has a base fabric on one side and a mesh on the other side, connected by fiber threads in the middle. The base fabric can be made of materials such as PET, PP, or fiberglass, which can prevent material leakage while allowing water to penetrate.

[0012] The mesh size of the permeation layer is generally designed to be between 4mm and 10mm, and the thickness of the permeation layer is between 3mm and 30mm. This size is suitable for general needs. Of course, thicker or thinner permeation layers can also be made by increasing or decreasing the mesh size accordingly. This invention does not impose any limitations on this.

[0013] S2. Filling the curing layer: The cement mixture is filled into the mesh of the penetrating layer to form the curing layer;

[0014] The cement mixture includes cement, aggregate, and coagulant. It is injected from one side of the mesh during filling. The base fabric of the permeable layer prevents the cement mixture from flowing out, and a vibrating device is used to make the cement mixture fill the permeable layer evenly.

[0015] S3. Cover with an anti-adhesion layer: Cover the upper surface of the permeation layer with reactive sand, a reactive coating, or a water-soluble film to form an anti-adhesion layer.

[0016] The main function of the anti-adhesion layer is to react with the cured cement mixture, enhance the adhesion between the cement mixture and the anti-adhesion layer, and make the reaction more thorough.

[0017] The thickness of the anti-adhesion layer is between 0.01mm and 0.5mm.

[0018] When using reactive sand, silica can be used.

[0019] When using reactive coatings, acrylic emulsions can be used.

[0020] When using a water-soluble membrane, polyvinyl alcohol can be used.

[0021] S4. Cover with a healing layer. Apply adhesive to the upper surface of the anti-adhesive layer to form a healing layer.

[0022] The healing layer material is one of pressure-sensitive adhesive, butyl rubber, or asphalt adhesive.

[0023] S5. Cover with a waterproof layer: Cover the surface of the healing layer with a waterproof material to form a waterproof layer;

[0024] The thickness of the waterproof layer is between 0.01mm and 1mm.

[0025] The waterproof layer uses high-polymer waterproof materials such as HDPE, LDPE, LLDPE, PVC, EPDM, and TPO. Using these materials as a waterproof layer effectively prevents water from seeping out of the waterproofing layer during hydration, thus avoiding any impact on the hydration effect and duration. It also reduces the amount of water used in the hydration process, conserving water resources. Furthermore, it can retain water to a certain extent, further accelerating the hydration process.

[0026] In addition, the use of polymer waterproof materials simplifies the construction process, allowing for direct use of welding equipment for overlapping, reducing damage to the healing and waterproof layers caused by self-tapping screws and expansion bolts.

[0027] S6. Puncture and suturing: Using needle puncture technique, fiber sutures are used to puncture and sew the penetrating layer, cement mixture, anti-adhesion layer, healing layer and waterproof layer to form an integral structure.

[0028] When the waterproof padding layer prepared by the above method is used, the permeable layer faces upward. After water is sprayed on the surface, the cement mixture solidifies and reacts with the anti-adhesive layer. On the one hand, it promotes the solidification of cement, and on the other hand, it fills the tiny pores in the cement to prevent water penetration. This is the first level of rigid waterproofing.

[0029] The underlying healing layer tightly wraps around the fiber thread used during needle puncture, thus preventing water from seeping out along the fiber thread. The waterproof layer further ensures the waterproof effect; this is the second level of flexible waterproofing.

[0030] The waterproof padding layer prepared by the above method achieves a perfect combination of rigid and flexible waterproofing.

[0031] The beneficial effects of this invention are as follows:

[0032] (1) The above-mentioned method for preparing the waterproof padding layer innovatively adopts the integral needle punching technology. Compared with the existing technology, which simply knits the cement mixture into a whole and then pastes the waterproof layer, it increases the adhesion and strength between the layers and ensures that the backing does not fall off.

[0033] (2) The above-mentioned waterproof padding layer preparation method replaces the traditional geotextile with the reverse adhesive layer design, which reacts with the cured cement mixture to make the two stick together firmly.

[0034] (3) The above-mentioned method for preparing the waterproofing layer innovatively adds a healing layer. Because this invention uses integral needle-punching technology to firmly stitch the cement mixture to the waterproofing layer, it prevents the backing from falling off. However, needle-punching the waterproofing layer will inevitably affect its waterproofing effect. The use of the healing layer allows it to tightly wrap the fiber threads when the waterproofing layer is punctured. The fiber threads can be made of PP, PET, glass fiber, etc., thereby preventing water droplets from seeping out along the fiber threads during hydration. This counteracts the potential water seepage problem caused by needle-punching of the waterproofing layer.

[0035] (4) The above-mentioned method for preparing the waterproof padding layer features a multi-layered structure. The anti-adhesive layer and the cement mixture adhere firmly together upon contact with water, while the healing layer is bonded between the anti-adhesive layer and the waterproof layer. This multi-layered structure, after curing, forms a complete waterproof padding product, achieving a perfect combination of rigid and flexible waterproofing, thus better ensuring the timeliness and effectiveness of waterproofing and seepage prevention. The backing will not fall off, resulting in a longer service life. Detailed Implementation

[0036] A method for preparing a water-curing, reverse-adhesive waterproof underlayment involves using a needle-punching technique to tightly stitch together five layers, including a cement mixture and a waterproof layer, increasing the adhesion and strength between the layers. This ensures waterproofing while preventing the backing from detaching. The specific steps are as follows:

[0037] S1. Lay the permeation layer, which is a 3D three-dimensional mesh fiber fabric with a thickness between 3mm and 30mm.

[0038] It has a base fabric on one side and a mesh on the other, connected by fiber threads in the middle. The base fabric can be made of materials such as PET, PP, or fiberglass. The three-dimensional mesh structure of the permeable layer can provide excellent water permeability and support.

[0039] The mesh size of the permeable layer is between 4mm and 10mm, and the shape is regular or irregular.

[0040] S2. Filling the curing layer: The cement mixture is filled into the mesh of the penetrating layer to form the curing layer;

[0041] The cement mixture comprises cement, aggregate, and a coagulant. During filling, it is injected from one side of the mesh. The base fabric of the permeable layer prevents the cement mixture from flowing out, and a vibrating device ensures the cement mixture is evenly distributed within the permeable layer. The cement mixture solidifies rapidly upon contact with water; adding a coagulant accelerates the solidification process and increases the strength of the cement mixture. This composition is standard; a suitable cement mixture can be selected and applied directly as needed, and further details are omitted.

[0042] S3. Cover with an anti-adhesion layer: Cover the upper surface of the permeation layer with reactive sand, a reactive coating, or a water-soluble film to form an anti-adhesion layer.

[0043] The main function of the anti-adhesion layer is to react with the cured cement mixture, enhance the adhesion between the cement mixture and the anti-adhesion layer, and make the reaction more thorough.

[0044] The thickness of the anti-adhesion layer is between 0.01mm and 0.5mm.

[0045] When using reactive sand, silica can be used.

[0046] When using reactive coatings, acrylic emulsions can be used.

[0047] When using a water-soluble membrane, polyvinyl alcohol can be used.

[0048] S4. Cover with a healing layer. Apply adhesive to the upper surface of the anti-adhesive layer to form a healing layer with a thickness between 0.01mm and 0.5mm.

[0049] The healing layer material is one of pressure-sensitive adhesive, butyl rubber, or asphalt adhesive.

[0050] Because this invention employs integral needle-punching technology, the cement mixture is firmly sewn together with the waterproof layer to prevent the backing from detaching. However, needle-punching the waterproof layer will inevitably affect its waterproofing effect. The use of a healing layer, when the waterproof layer is punctured, tightly wraps around the PP fiber threads, thereby preventing water droplets from seeping along the fiber threads during hydration. This counteracts the potential water seepage problems caused by needle-punching of the waterproof layer.

[0051] S5. Cover with a waterproof layer: Cover the surface of the healing layer with a waterproof material to form a waterproof layer;

[0052] The thickness of the waterproof layer is between 0.01mm and 1mm.

[0053] The waterproof layer uses high-polymer waterproof materials such as HDPE, LDPE, LLDPE, PVC, EPDM, and TPO. Using these materials as a waterproof layer effectively prevents water from seeping out of the waterproofing layer during hydration, thus avoiding any impact on the hydration effect and duration. It also reduces the amount of water used in the hydration process, conserving water resources. Furthermore, it can retain water to a certain extent, further accelerating the hydration process.

[0054] In addition, the use of polymer waterproof materials simplifies the construction process, allowing for direct use of welding equipment for overlapping, reducing damage to the healing and waterproof layers caused by self-tapping screws and expansion bolts.

[0055] S6. Puncture and suturing: Using needle puncture technique, fiber sutures are used to puncture and sew the penetrating layer, cement mixture, anti-adhesion layer, healing layer and waterproof layer to form an integral structure.

[0056] When the waterproof padding layer prepared by the above method is used, the permeable layer faces upward. After water is sprayed on the surface, the cement mixture solidifies and reacts with the anti-adhesive layer. On the one hand, it promotes the solidification of cement, and on the other hand, it fills the tiny pores in the cement to prevent water penetration. This is the first level of rigid waterproofing.

[0057] The underlying healing layer tightly wraps around the fiber thread used during needle puncture, thus preventing water from seeping out along the fiber thread. The waterproof layer further ensures the waterproof effect; this is the second level of flexible waterproofing.

[0058] The waterproof padding layer prepared by the above method achieves a perfect combination of rigid and flexible waterproofing.

[0059] The following are several specific examples illustrating the preparation method of the waterproof underlayment of the present invention:

[0060] Example 1

[0061] S1. Lay a 6mm thick permeation layer on the base surface. The permeation layer is a 3D three-dimensional mesh fiber fabric with a mesh diameter of 4mm.

[0062] S2. Fill the permeable layer with a cement mixture containing cement, aggregate and coagulant. Fill the permeable layer with the cement mixture and use a vibrating device to make the cement mixture fill the permeable layer evenly.

[0063] S3. Cover with an anti-adhesion layer, covering the upper surface of the permeation layer with a 0.01mm-0.5mm thick polyvinyl alcohol water-soluble film.

[0064] S4. Apply a 0.01mm-0.5mm thick pressure-sensitive adhesive to the upper surface of the anti-adhesive layer to form a healing layer.

[0065] S5. Cover with a waterproof layer: Cover the surface of the healing layer with 0.01mm-1mm thick HDPE waterproof material to form a waterproof layer;

[0066] S6. Puncture and suturing: Using needle puncture technique, fiber sutures are used to puncture and sew the penetrating layer, cement mixture, anti-adhesion layer, healing layer and waterproof layer to form an integral structure.

[0067] Example 2

[0068] S1. Lay a 20mm thick permeation layer on the base surface. The permeation layer is a 3D three-dimensional mesh fiber fabric with a mesh diameter of 7mm.

[0069] S2. Fill the permeable layer with a cement mixture containing cement, aggregate and coagulant. Fill the permeable layer with the cement mixture and use a vibrating device to make the cement mixture fill the permeable layer evenly.

[0070] S3. Cover with an anti-adhesion layer, and cover the upper surface of the penetration layer with an acrylic emulsion reactive coating with a thickness of 0.01mm-0.5mm.

[0071] S4. Cover with a healing layer. Apply a 0.01mm-0.5mm thick layer of butyl glue to the upper surface of the anti-adhesion layer to form a healing layer.

[0072] S5. Cover with a waterproof layer: Cover the surface of the healing layer with 0.01mm-1mm thick LDPE waterproof material to form a waterproof layer;

[0073] S6. Puncture and suturing: Using needle puncture technique, fiber sutures are used to puncture and sew the penetrating layer, cement mixture, anti-adhesion layer, healing layer and waterproof layer to form an integral structure.

[0074] Example 3

[0075] S1. Lay a 30mm thick permeation layer on the base surface. The permeation layer is a 3D three-dimensional mesh fiber fabric with a mesh diameter of 10mm.

[0076] S2. Fill the permeable layer with a cement mixture containing cement, aggregate and coagulant. Fill the permeable layer with the cement mixture and use a vibrating device to make the cement mixture fill the permeable layer evenly.

[0077] S3. Cover with a reverse adhesion layer, and cover the upper surface of the penetration layer with a 0.01mm-0.5mm thick layer of silica reaction sand.

[0078] S4. Cover with a healing layer. Apply a 0.01mm-0.5mm thick layer of asphalt adhesive to the surface of the anti-adhesion layer to form a healing layer.

[0079] S5. Cover with a waterproof layer: Cover the surface of the healing layer with 0.01mm-1mm thick PVC waterproof material to form a waterproof layer;

[0080] S6. Puncture and suturing: Using needle puncture technique, fiber sutures are used to puncture and sew the penetrating layer, cement mixture, anti-adhesion layer, healing layer and waterproof layer to form an integral structure.

Claims

1. A method for preparing a water-curable, reverse-adhesive waterproof pad, characterized in that, The specific steps are as follows: S1. Lay a permeable layer, wherein the permeable layer is a 3D three-dimensional mesh fiber fabric; S2. Filling the curing layer: The cement mixture is filled into the mesh of the penetrating layer to form the curing layer; The cement mixture includes cement, aggregates, and a coagulant; S3. Cover with an anti-adhesion layer: Cover the upper surface of the permeation layer with reactive sand, a reactive coating, or a water-soluble film to form an anti-adhesion layer. S4. Cover with a healing layer. Apply adhesive to the upper surface of the anti-adhesive layer to form a healing layer. S5. Cover with a waterproof layer: Cover the surface of the healing layer with a waterproof material to form a waterproof layer; S6. Puncture and suturing: Using needle puncture technique, fiber sutures are used to puncture and sew the penetrating layer, cement mixture, anti-adhesion layer, healing layer and waterproof layer to form an integral structure.

2. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, In step S1, the mesh size of the permeation layer is between 4mm and 10mm, and the thickness of the permeation layer is between 3mm and 30mm.

3. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, In step S2, a vibrating device is used to ensure that the cement mixture is evenly filled in the permeable layer.

4. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, In step S3, the thickness of the anti-adhesion layer is between 0.01 mm and 0.5 mm.

5. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, The reaction sand comprises silicon dioxide.

6. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, The reactive coating comprises an acrylic emulsion.

7. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, The aqueous film comprises polyvinyl alcohol.

8. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, In step S4, the healing layer material is one of pressure-sensitive adhesive, butyl rubber, or asphalt adhesive.

9. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, In step S5, the waterproof layer is made of a polymer waterproof material.

10. The method for preparing a water-curable, anti-adhesive waterproof pad according to claim 1, characterized in that, The thickness of the waterproof layer is between 0.01mm and 1mm.