Near-infrared light curing pipeline repair lining hose material

Abstract

The invention discloses a near-infrared light curing pipeline repair lining hose material, a hose is sequentially composed of an infrared light transmitting inner film layer, a glass fiber fabric resin composite layer, a basalt fiber fabric resin composite layer and an outer protective film layer from inside to outside, the hose finished product is in a flattened shape and can be folded at will, and when in use, the hose finished product is pressed and blown up by an air compressor, so that the near-infrared light curing pipeline repair lining hose material is obtained. The embedded pipe fitting is attached to the inner wall of a repaired pipeline, infrared light is absorbed through the photo-thermal agent and converted into heat energy, a resin thermocuring reaction is initiated, and the embedded pipe fitting is formed after the polymerization reaction. Compared with the prior art, the material has the advantages of excellent low-temperature resistance, high-temperature resistance, low volume weight, low heat conductivity, thermal shock resistance, chemical corrosion resistance, high elastic modulus, good flexibility, wear resistance and the like, is suitable for repairing pipelines with the pipe diameter larger than 1000 mm and serious damage, and has the hose thickness reaching 12-30 mm.

Description

Technical Field

[0001] This invention relates to the field of trenchless repair technology for municipal pipelines, and in particular to a near-infrared light-curing pipeline repair lining hose material. Background Technology

[0002] Underground pipe networks are a vital urban infrastructure, serving as the "underground lifeline" ensuring the overall normal operation of urban functions. With urban development, the scale of urban underground pipe networks continues to expand. Early-built urban pipe networks, due to their long service life and load changes caused by urban redevelopment and expansion, suffer from aging, corrosion, damage, and deformation, severely impacting urban flood control, drainage, and aquatic ecosystems. Trenchless repair technology is a minimally invasive technique for solving the problem of underground pipeline damage. It allows for the repair of pipelines across rivers, lakes, major transportation routes, and important buildings with little or no surface excavation.

[0003] Existing UV curing in-situ pipeline repair technology uses a UV initiation system and glass fiber resin composite pipe as the material. Due to the short wavelength of UV light, its penetration ability is limited, and the thickness can only be controlled within 16mm. Furthermore, pure glass fiber resin composite pipe has lower mechanical properties, temperature resistance range, and corrosion resistance compared to basalt fiber resin composite pipe. Therefore, it can only be applied to standardized repair projects for small and medium diameter pipes. It cannot repair pipes with a diameter greater than 1000mm, in harsh environments, or with severe damage. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength near-infrared light-curing pipe repair lining hose material composed of multiple high-performance fiber fabrics and resins. It not only has high overall strength and can be used for the repair of large-diameter pipes, but also strengthens the local areas of the repaired pipe with high stress after being compressed, which greatly increases the service life of the repaired pipe. At the same time, it solves the problems of aging, corrosion, damage and deformation of the repaired pipe.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A near-infrared light-curing pipe repair lining hose material includes a hose comprising, from the inside out, an infrared-transmitting inner film layer, a glass fiber fabric resin composite layer, a basalt fiber fabric resin composite layer, and an outer protective film layer. The finished hose is flattened and can be folded arbitrarily. During use, it is pressurized and inflated using an air compressor and then adhered to the inner wall of the pipe to be repaired. A photothermal agent absorbs infrared light and converts it into heat energy, initiating a thermocuring reaction in the resin. After polymerization, an inner lining hose is formed.

[0007] The glass fiber fabric resin composite layer is composed of glass fiber fabric and resin. The glass fiber fabric is composed of untwisted glass fiber mesh and chopped glass fiber filaments. The chopped glass fiber filaments are laid flat and randomly on the untwisted glass fiber mesh and sewn together to form the glass fiber fabric. The resin is impregnated in the glass fiber fabric.

[0008] The basalt fiber fabric resin composite layer is composed of basalt fiber fabric and resin. The basalt fiber fabric is composed of basalt fiber untwisted coarse spun mesh and chopped basalt fiber filaments. The chopped basalt fiber filaments are laid flat on the basalt fiber untwisted coarse spun mesh in an undirected manner and are sewn together to form the basalt fiber fabric. The resin is impregnated in the basalt fiber fabric.

[0009] Preferably, the glass fiber fabric is an alkali-resistant glass fiber fabric, using glass fiber roving. Untwisted roving is laid parallel to the fabric length direction at 0° (warp) or 90° (weft) and then sewn into a mesh fabric. Laying untwisted roving in one direction is suitable for scenarios where unidirectional strength is required (such as pipelines dominated by circumferential pressure). Alternatively, untwisted roving can be laid parallel to any two of the four directions at 0°, 90°, and ±45° to the fabric length direction, with each direction forming an independent yarn layer, and then sewn into a biaxial mesh fabric. Laying untwisted roving in both directions allows the fabric to form a balanced load-bearing structure in the warp and weft directions, adapting to the complex stress (circumferential pressure + axial tension) of pipelines. After the glass fiber filaments are cut into 4-6cm lengths, they are laid evenly and randomly on the mesh fabric, and then sewn together with polyester thread to obtain the glass fiber fabric.

[0010] Preferably, the ratio of the basis weight of the glass fiber untwisted coarse spun mesh to the basis weight of the chopped glass fiber filaments is 2:1.

[0011] Preferably, the basalt fiber fabric uses basalt fiber roving with a single filament diameter of 3-20μm. Untwisted roving is laid parallel to the fabric length direction at 0° (warp) or 90° (weft) and sewn into a mesh fabric. Laying untwisted roving in one direction is suitable for scenarios where unidirectional strength is required (such as pipelines dominated by circumferential pressure). Alternatively, untwisted roving can be laid parallel to any two of the four directions at 0°, 90°, ±45° to the fabric length direction, with each direction forming an independent yarn layer, and sewn into a biaxial mesh fabric. Bidirectional laying of untwisted roving allows the fabric to form a balanced load-bearing structure in both the warp and weft directions, adapting to the complex stress (circumferential pressure + axial tension) of pipelines. After the basalt fiber filaments are cut into 4-6cm lengths, they are laid evenly and randomly on the mesh fabric and then sewn together with polyester thread to obtain the basalt fiber fabric.

[0012] The addition of the basalt fiber fabric resin composite layer not only further enhances the overall structural strength of the hose, but also the basalt fiber fabric weaving structure references the structural design of glass fiber fabric. Through the above-mentioned basalt fiber fabric structure, the final basalt fiber fabric resin composite layer has excellent structural strength. Under the combined effect, the hose of this invention can be used for pipeline repair of pipes larger than 1000mm.

[0013] Preferably, the ratio of the basis weight of the basalt fiber untwisted coarse spun mesh to the basis weight of the chopped basalt fiber filaments is 2:1.

[0014] Preferably, the glass fiber fabric resin composite layer and the basalt fiber fabric resin composite layer are sequentially wrapped in a ring around the infrared-transparent inner membrane layer. Through the pressure model of the buried pipeline and the pressure finite element analysis, it was determined that when the pipeline to be repaired is under pressure, the stress and strain in the 45° area in the four directions (up, down, left, and right) are relatively large, which are weak areas and require structural reinforcement during repair. Therefore, when overlapping the glass fiber fabric resin composite layer and the basalt fiber fabric resin composite layer, the 45° area in the four directions of the hose is used as the overlap reinforcement area. The first and last overlap parts of the glass fiber fabric resin composite layer and the basalt fiber fabric resin composite layer are evenly arranged in the overlap reinforcement area. By utilizing the double-layer structure at the overlap, the weak points of the pipe are locally reinforced. While saving raw materials, the local strength is increased in a targeted manner, the overall thickness of the hose is reduced, and the inner diameter of the repaired pipeline is guaranteed to meet the requirements.

[0015] Preferably, the ratio of glass fiber fabric to basalt fiber fabric in the glass fiber fabric resin composite layer and the basalt fiber fabric resin composite layer is 4:1. Glass fiber has higher technical maturity, wider application and lower price than basalt fiber. Basalt fiber performs better in high temperature resistance, environmental protection and some mechanical properties, but its cost is usually higher. The preferred solution adopts a 4:1 ratio, which is conducive to comprehensive cost control and application promotion.

[0016] Preferably, the resin is an infrared light-curing resin, and graphene photothermal conversion agent and peroxide thermal initiator are added to the resin. When irradiated with an infrared lamp, the heat energy generated by the photothermal conversion agent is transferred to the surrounding resin. When the temperature rises, the thermal initiator is activated, and the thermal initiator decomposes to generate free radicals, thereby initiating the polymerization and crosslinking reaction of the monomers.

[0017] The resin is impregnated in glass fiber fabric and silane fiber fabric. The resin contains a photothermal conversion agent and a thermal initiator. During repair, infrared light passes through the inner membrane and irradiates the resin fiber fabric layer. The photothermal conversion agent converts the absorbed infrared light into heat energy, thereby indirectly initiating the resin polymerization reaction impregnated in the glass fiber fabric that requires heat activation.

[0018] The photothermal conversion agent added to the resin is graphene. When irradiated with an infrared lamp, the photothermal conversion agent converts the absorbed infrared light into heat energy, which is then transferred to the surrounding resin system. When the temperature rises sufficiently to activate the thermal initiator peroxide in the system, the thermal initiator decomposes to generate free radicals, thereby initiating the polymerization and cross-linking reaction of the monomers. After the reaction, the heat of reaction spontaneously propagates forward until all the resin is cured. Because graphene has extremely high photothermal conversion efficiency, its addition amount is between 0.05% and 0.2%.

[0019] Preferably, the inner membrane of the infrared-transmitting inner membrane layer is cylindrical and located inside the hose. The main component of the inner membrane is an asymmetric multilayer composite membrane of polyethylene (PE) and polyamide (PA). Barium sulfate (BaSO4) is added as an infrared-transmitting filler during blown film forming. It can selectively scatter visible light while allowing infrared light to pass through, and has the characteristics of heat resistance and infrared light transmission.

[0020] Preferably, the outer protective film is sheet-like and is a PVC film, which has the characteristics of blocking infrared light, puncture resistance, one-way breathability, and waterproofing. After being wrapped around the fiber fabric, it is formed into a tube shape by using strong adhesive tape or hot melt bonding. Fillers such as polyaniline, polypyrrole, and barium ferrite are added to the PVC film. Through the synergistic effect of conductive loss and magnetic loss, it strongly absorbs electromagnetic waves (including near-infrared), and the transmittance in the near-infrared region can be less than 0.2%.

[0021] Compared with the prior art, the advantages of the present invention are as follows: After photocuring, the product of the present invention has excellent low temperature resistance, high temperature resistance, low density, low thermal conductivity, thermal shock resistance, chemical corrosion resistance, high elastic modulus, good flexibility, and wear resistance. It is suitable for repairing pipes with a diameter greater than 1000mm and severe damage, and its hose thickness can reach 12-30mm. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the product structure of the photocurable pipe repair lining hose of the present invention;

[0023] Figure 2 This is a diagram illustrating the pressure effect on the buried pipeline of the present invention.

[0024] Figure 3 This is a finite element stress analysis diagram of the buried pipeline pressure model of the present invention;

[0025] Figure 4 This is a schematic diagram of the overlapping of the fiber fabric of the present invention;

[0026] Figure 5 This is a diagram illustrating the implementation effect of the present invention.

[0027] In the diagram: 1. Infrared-transmitting inner membrane layer; 2. Glass fiber fabric resin composite layer; 3. Basalt fiber fabric resin composite layer; 4. Outer protective membrane layer; 5. Traction flat wire; 6. Pipe being repaired; 7. Flexible hose. Detailed Implementation

[0028] Example: A near-infrared light-curing pipe repair lining hose material, comprising a hose 7, wherein the hose 7 is composed of, from the inside out, an infrared-transmitting inner film layer 1, a glass fiber fabric resin composite layer 2, a basalt fiber fabric resin composite layer 3, and an outer protective film layer 4, (see [reference]). Figure 1 ,

[0029] The process flow is as follows:

[0030] First, based on the length and diameter of the pipe 6 to be repaired, select the size of the infrared-transmitting inner membrane 1, with its diameter slightly smaller than that of the pipe 6 to be repaired and its length slightly larger than that of the pipe 6 to be repaired.

[0031] Then, the glass fiber fabric and basalt fiber fabric are wrapped in a ring around the infrared-transparent inner membrane 1 in accordance with the layer ratio of the present invention. The overlap of the glass fiber fabric and basalt fiber fabric is located in the overlap reinforcement area. Then, the outer protective film 4 is wrapped in a ring around the fabric and the overlap is welded or bonded to obtain the main body of the hose 7.

[0032] Finally, the two ends of the hose 7 are sealed, and the cavity between the infrared-transmitting inner membrane 1 and the outer protective membrane 4 is evacuated, causing the hose 7 to flatten under atmospheric pressure. Using the vacuum negative pressure, resin is drawn into the glass fiber fabric and basalt fiber fabric, and then assisted in rolling to form the glass fiber fabric resin composite layer 2 and the basalt fiber fabric resin composite layer 3.

[0033] When using, please refer to Figure 5 :

[0034] The hose 7 is pulled into the pipe 6 to be repaired, and then pressurized and inflated with an air compressor to fit against the inner wall of the pipe 6. The traction flat wire 5 is used to pull the hose containing a near-infrared lamp into the hose 7. The infrared light passes through the inner membrane and irradiates the resin fiber fabric layer. The photothermal conversion agent converts the absorbed infrared light into heat energy, thereby indirectly initiating the polymerization reaction of the resin impregnated on the glass fiber fabric, which requires heat activation. After the polymerization reaction, an inner nested tube is formed, which has the characteristics of leak prevention, chemical corrosion resistance, high elastic modulus, good flexibility, and wear resistance.

[0035] When performing photocuring:

[0036] The light source uses near-infrared light with a wavelength of 780-1100nm, such as lasers or LEDs with wavelengths of 808nm, 980nm, or 1064nm. This light has low scattering and absorption in the resin, enabling centimeter-level deep curing. Compared to ultraviolet light, it has extremely strong penetration, making it particularly suitable for penetrating thicker materials and the black basalt fiber fabric selected in this invention. The traction flat thread 5 of the light source is made of aramid fiber with a thickness of less than 0.5mm and a width of 5mm-20mm, exhibiting high performance characteristics such as flame retardancy, corrosion resistance, high tensile strength, and abrasion and cut resistance.

[0037] (1) Comparative experiment

[0038] A comparison of the short-term mechanical properties of the polymerized inner-lined hoses is shown in Table 1.

[0039] Note: 1. Fiberglass and basalt fiber resin composite board: 8 layers of fiberglass, 2 layers of basalt fiber; resin content: 50%; pre-curing conditions: LED light, 300W / m 2 15 min; Post-curing conditions: 80℃, 24 h.

[0040] 2. Fiberglass Resin Composite Board: 10 layers of fiberglass. Resin content: 50%; Pre-curing conditions: LED light; 300W / m² 2 15 min; Post-curing conditions: 80℃, 24 h.

[0041] Comparison of corrosion resistance of lined hoses after polymerization:

[0042] Note: The immersion time for chemical resistance testing should be 28 days, and the test temperature should be 23℃±2℃.

[0043] Conclusion: Compared with existing light-cured pipe repair lining hoses, the present invention significantly improves strength, high temperature resistance, and acid and alkali resistance in all aspects.

[0044] (2) The overlapping and laying process of the glass fiber fabric resin composite layer 2 and the basalt fiber fabric resin composite layer 3 is as follows:

[0045] A stress model of the buried repaired pipeline 6 under pressure was constructed, and the pressure effect of the buried repaired pipeline 6 is described in [reference needed]. Figure 2 Finite element analysis was performed using the pressure model of the buried pipeline 6 under repair; the results are shown in [reference needed]. Figure 3It can be seen that when the repaired pipe 6 is under pressure, the stress and strain in the 45° area (top, bottom, left, and right) are relatively large, making it a weak area. Therefore, the weak area needs structural reinforcement during repair. To address the areas with high stress and strain under pressure and prevent damage after repair, the overlapping areas of each layer of fiberglass or basalt fiber are evenly distributed in this area. Since the thickness of the overlapping area is double-layered, its structural strength is greater. Therefore, using the weak area as an overlapping reinforcement area can effectively improve the structural strength of the hose 7. The final schematic diagram of the fiber optic and basalt fiber fabric overlap is shown below. Figure 4 As shown.

[0046] The present invention provides a detailed description of a near-infrared light-curing pipe repair lining hose material. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the invention. At the same time, for those skilled in the art, based on the ideas of the invention, there will be changes in the specific implementation methods and application scope. Modifications and improvements to the invention are possible without exceeding the concept and scope defined by the appended claims. Therefore, the content of this specification should not be construed as a limitation of the invention.

Claims

1. A near-infrared light-curing pipe repair lining hose material, comprising a hose, characterized in that: The flexible tube consists of, from the inside out, an infrared-transparent inner film layer, a glass fiber fabric resin composite layer, a basalt fiber fabric resin composite layer, and an outer protective film layer. The glass fiber fabric resin composite layer is composed of glass fiber fabric and resin. The glass fiber fabric is composed of untwisted glass fiber mesh and chopped glass fiber filaments. The chopped glass fiber filaments are laid flat and randomly on the untwisted glass fiber mesh and sewn together to form the glass fiber fabric. The resin is impregnated in the glass fiber fabric. The basalt fiber fabric resin composite layer is composed of basalt fiber fabric and resin. The basalt fiber fabric is composed of basalt fiber untwisted coarse spun mesh and chopped basalt fiber filaments. The chopped basalt fiber filaments are laid flat on the basalt fiber untwisted coarse spun mesh in an undirected manner and are sewn together to form the basalt fiber fabric. The resin is impregnated in the basalt fiber fabric.

2. The near-infrared light-curing pipe repair lining hose material according to claim 1, characterized in that: The glass fiber fabric is an alkali-resistant glass fiber fabric, using glass fiber roving with a single filament diameter of 3-50μm; untwisted roving is laid parallel to the fabric length direction at 0° (warp) or 90° (weft) and sewn into a mesh fabric; or untwisted roving is laid parallel to any two of the four directions at 0°, 90°, ±45° to the fabric length direction, with each direction forming an independent yarn layer, and sewn into a biaxial mesh fabric; glass fiber filaments are cut into 4-6cm lengths and laid evenly and randomly on the mesh fabric, and then sewn with polyester thread to obtain the glass fiber fabric.

3. The near-infrared light-curing pipe repair lining hose material according to claim 2, characterized in that: The weight ratio of the glass fiber untwisted coarse spun mesh to the weight ratio of the chopped glass fiber filaments is 2:

1.

4. The near-infrared light-curing pipe repair lining hose material according to claim 1, characterized in that: The basalt fiber fabric uses basalt fiber roving with a single filament diameter of 3-20μm. Untwisted roving is laid parallel to the fabric length direction at 0° (warp) or 90° (weft) and sewn into a mesh fabric. Alternatively, untwisted roving is laid parallel to any two of the four directions at 0°, 90°, ±45° to the fabric length direction, with each direction forming an independent yarn layer, and sewn into a biaxial mesh fabric. The basalt fiber filaments are cut into 4-6cm lengths and laid evenly and randomly on the mesh fabric, and then sewn together with polyester thread to obtain the basalt fiber fabric.

5. The near-infrared light-curing pipe repair lining hose material according to claim 4, characterized in that: The weight ratio of the basalt fiber untwisted coarse spun mesh to the weight ratio of the chopped basalt fiber filaments is 2:

1.

6. The near-infrared light-curing pipe repair lining hose material according to claim 1, characterized in that: The glass fiber fabric resin composite layer and the basalt fiber fabric resin composite layer are sequentially wrapped in a ring around the infrared-transparent inner membrane layer. Through the pressure model of the buried pipeline and the pressure finite element analysis, when laying the glass fiber fabric resin composite layer and the basalt fiber fabric resin composite layer by overlapping, the 45° area in the four directions of the hose is used as the overlap reinforcement area of ​​the glass fiber fabric resin composite layer and the basalt fiber fabric resin composite layer.

7. The near-infrared light-curing pipe repair lining hose material according to claim 1, characterized in that: The ratio of glass fiber fabric to basalt fiber fabric in the glass fiber fabric resin composite layer and the basalt fiber fabric resin composite layer is 4:

1.

8. The near-infrared light-curing pipe repair lining hose material according to claim 1, characterized in that: The resin is an infrared light-curing resin, and graphene photothermal conversion agent and peroxide thermal initiator are added to the resin.

9. The near-infrared light-curing pipe repair lining hose material according to claim 1, characterized in that: The inner membrane of the infrared-transmitting inner membrane layer is cylindrical and located inside the hose. The main component of the inner membrane is an asymmetric multilayer composite membrane of polyethylene (PE) and polyamide (PA). Barium sulfate (BaSO4) is added as an infrared-transmitting filler during blown film forming, which can selectively scatter visible light while allowing infrared light to pass through.

10. The near-infrared light-curing pipe repair lining hose material according to claim 1, characterized in that: The outer protective film is sheet-like and is made of PVC film. After being wrapped around the fiber fabric, it is formed into a tube shape by using strong adhesive tape or hot melt bonding. Polyaniline, polypyrrole and barium ferrite fillers are added to the PVC film, and the transmittance in the near-infrared region can be less than 0.2%.

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