UV-CIPP material for pipeline repair and intelligent water level monitoring and preparation method of UV-CIPP material

Abstract

The invention discloses a UV-CIPP material for pipeline repair and intelligent water level monitoring and a preparation method of the UV-CIPP material, and belongs to the technical field of ultraviolet curing pipeline repair. The preparation method comprises the following steps: selecting a proper amount of MWCNTs solution; the woven glass fibers are put into the dipping solution to be soaked; coating a conductive silver adhesive on the woven glass fiber, and pasting a copper electrode; adding a thermal initiator into the ultraviolet curing resin; pouring the resin into a mold, and laying woven glass fibers; and carrying out ultraviolet light curing and thermocuring on the prefabricated member. By introducing the MWCNTs impregnated woven glass fiber sensing layer and adopting ultraviolet light / heat dual curing, the intelligent pipeline composite material with ultrahigh strength and ultrahigh sensing capacity is formed, and the change of the water level in a pipeline can be monitored in real time while the pipeline is repaired.

Description

Technical Field

[0001] The invention relates to the technical field of ultraviolet light curing pipeline repair, and in particular to a UV-CIPP material for pipeline repair and water level intelligent monitoring and a preparation method thereof. Background Art

[0002] With the acceleration of urbanization and the increase in population, the construction and maintenance of municipal drainage pipe network systems have become particularly important. However, after long-term use, traditional pipes often have problems such as aging, damage, and leakage, which leads to the decline of drainage system function and may even cause environmental pollution and safety hazards. In order to solve these problems, pipeline repair technology has been widely studied and applied. Traditional excavation repair methods have gradually been replaced by trenchless repair technologies due to their long construction period, great impact on the surrounding environment, and high cost. Among them, ultraviolet light curing lining repair (UV-CIPP) technology has become a research hotspot and application focus in the field of trenchless repair due to its advantages such as high efficiency, environmental protection, and short construction time.

[0003] UV-CIPP technology is a lining repair technology that cures through ultraviolet light. This technology uses special lining materials to re-cover the inner wall of old or damaged pipes, thereby achieving the purpose of repairing the pipes. Specifically, the UV-CIPP repair process includes: first, the lining material is transported to the pipe to be repaired by traction or air pressure, and then the lining material is irradiated with an ultraviolet light source to react and form a hard pipe lining. This method can not only greatly reduce the repair time, but also avoid the traffic impact and environmental pollution caused by excavation construction.

[0004] However, with the development of technology and the deepening of application, UV-CIPP technology also faces some challenges. Existing UV-CIPP materials may have problems such as decreased mechanical properties in long-term use, thus affecting the life of the repaired pipeline. In addition, traditional UV-CIPP materials are more sensitive to external conditions such as ambient temperature and humidity during the repair process, which makes construction more difficult in different regions or seasons.

[0005] In addition, water level monitoring in pipes is also an important part of municipal drainage system management. At present, water level monitoring mainly relies on traditional float switches, ultrasonic sensors and other equipment. Although these devices can monitor water levels to a certain extent, they also have some shortcomings. For example, the float switch has low sensitivity and is easily affected by water flow fluctuations and produces false alarms; ultrasonic sensors are prone to reflection interference in complex fluid environments, resulting in inaccurate measurements. In addition, traditional water level monitoring equipment lacks durability and stability in harsh environments, and is easily affected by factors such as corrosion and dirt accumulation, resulting in equipment failure or increased measurement errors.

[0006] Patent number CN118027606B discloses a trenchless repair material for pipelines and its preparation method. It uses resin and vinyl resin as the base material, and adds various additives on this basis to further improve the mechanical properties, corrosion resistance, and anti-scouring properties of the material. However, this patent only solves the problem of the mechanical properties of the repair material, and does not solve the problem of water level monitoring inside the pipeline.

[0007] Therefore, it is necessary to provide a UV-CIPP material for pipeline repair and water level intelligent monitoring and a preparation method thereof. Summary of the invention

[0008] The purpose of the present invention is to provide a UV-CIPP material for pipeline repair and water level intelligent monitoring and a preparation method thereof, so as to solve the problem of being able to monitor the water level changes in the pipeline in real time while repairing the pipeline.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] A UV-CIPP material for pipeline repair and water level intelligent monitoring, comprising the following raw materials in parts by weight:

[0011] 100 parts of UV-curable resin, 10-15 parts of woven glass fiber, 30-33 parts of curing agent, 200 parts of carboxyl-treated MWCNTs solution, and 1.5 parts of thermal initiator;

[0012] The carboxylation treated MWCNTs solution is prepared by the following steps:

[0013] Step A, mixing deionized water with a 5% carboxyl-treated MWCNTs solution, and stirring evenly to form an impregnation solution, i.e., a carboxyl-treated MWCNTs solution;

[0014] The thermal initiator is prepared by the following steps:

[0015] Step B: Stir and mix 98.5% tert-butyl perbenzoate (TBPB) solution and dibenzoyl peroxide (BPO) powder to obtain a thermal initiator.

[0016] Furthermore, in step B, the usage ratio of 98.5% concentration of tert-butyl perbenzoate (TBPB) solution and dibenzoyl peroxide (BPO) powder is 0.5g:1g.

[0017] Furthermore, a method for preparing the UV-CIPP material for pipeline repair and water level intelligent monitoring as described above comprises the following steps:

[0018] S1, selecting appropriate amounts of carboxyl-treated MWCNTs solutions with different mass fractions as impregnation solutions;

[0019] S2, soaking the woven glass fiber in the impregnation solution for a period of time, and then taking it out and drying it;

[0020] S3, applying conductive silver glue on both ends of the dried woven glass fiber, and pasting copper electrodes after the conductive silver glue is solidified;

[0021] S4, adding the thermal initiator to the ultraviolet curing resin, mixing well and placing in a vacuum barrel;

[0022] S5, pour the resin into the mold, lay the woven glass fiber, wait until the woven glass fiber is completely impregnated, then pour the resin, then lay the second layer of woven glass fiber, repeat the operation until the third layer of woven glass fiber is laid, and finally pour the resin on the top; then put the test piece into a vacuum barrel, place it under a pressure of -100PSI for 1 hour, and then take it out to obtain a prefabricated part;

[0023] S6, UV curing and heat curing the prefabricated part in sequence, demoulding the prefabricated part after cooling to room temperature, and completing the preparation of the test piece.

[0024] Furthermore, in step S1, the usage ratio of deionized water and 5% carboxylation-treated MWCNTs solution is 160-192 ml: 8-40 g.

[0025] Furthermore, the stirring process in step S1 is: stirring at 1000 R / min for 30 min under a high-speed stirrer.

[0026] The present invention has the following beneficial effects:

[0027] The present invention introduces MWCNTs impregnated woven glass fiber sensing layer and adopts UV / heat dual curing to form an intelligent pipeline composite material with ultra-high strength and ultra-high sensing capability. While repairing the pipeline, it can monitor the water level changes in the pipeline in real time, providing strong support for the efficient management of the municipal drainage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 It is a production flow chart of the present invention;

[0030] Figure 2 This is a schematic diagram of intelligent pipeline monitoring in the present invention;

[0031] Figure 3 The resistance response curve of the test piece of the present invention when the temperature is increased by 100°C and decreased by 20°C;

[0032] Figure 4It is a resistance response curve diagram of the test piece with different MWCNTs impregnation concentrations in the present invention under the cycle test of 15°C / 60°C water temperature.

[0033] Figure numerals: 1. resin layer; 2. copper electrode; 3. woven glass fiber layer impregnated with multi-walled carbon nanotubes; 4. unimpregnated woven glass fiber layer; 5. data collector; 6. UV-CIPP composite material; 7. pipeline; 8. water; 9. remote control center. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] See also Figure 1 , the present invention provides a technical solution: a UV-CIPP material for pipeline repair and water level intelligent monitoring, a plurality of resin layers 1 spaced from bottom to top;

[0037] A plurality of woven glass fiber layers are arranged between two adjacent resin layers 1, and the resin layer and the woven glass fiber layer are cured and connected;

[0038] The woven glass fiber layer at the top is a woven glass fiber layer 3 impregnated with multi-walled carbon nanotubes and connected to a copper electrode, with both ends of the copper electrode 2 extending a distance to both sides respectively; the remaining woven glass fiber layers are unimpregnated woven glass fiber layers 4.

[0039] A method for preparing a UV-CIPP material for pipeline repair and water level intelligent monitoring, comprising the following raw materials in parts by weight:

[0040] 100 parts of UV-curable resin, 10-15 parts of woven glass fiber, 30-33 parts of curing agent, 200 parts of carboxyl-treated MWCNTs solution, and 1.5 parts of thermal initiator;

[0041] A method for preparing a UV-CIPP material for pipeline repair and water level intelligent monitoring comprises the following steps:

[0042] Step 1: Select appropriate amounts of carboxyl-treated MWCNTs solutions with different mass fractions as impregnation solutions.

[0043] Step 2, soak the cut woven glass fiber for 2 hours, take it out and dry it on a tray bracket, put it in an oven at 150°C for 15 hours, then take it out and seal it for use.

[0044] Step 3: To achieve a good and stable electrical signal output, apply conductive silver glue to both ends of the dried woven glass fiber, and paste the copper electrode 2 after the conductive silver glue is cured, and apply the conductive silver glue again for reinforcement. To achieve rapid curing of the conductive silver glue, put it in an oven at 100°C for 30 minutes, and take it out and seal it for use.

[0045] Step 4, add the thermal initiator to the UV-curable resin at 1.5% of the weight of the UV-curable resin, stir and mix well, put it into a vacuum barrel, and place it at -100PSI pressure for 5 minutes. The UV-curable resin material is preferably carbon nanotubes. Since carbon nanomaterials are strong UV absorbers, the intensity of UV light will be weakened during the curing process, and the transmittance of the material will be reduced, resulting in a poor curing degree of the composite material, or even the material being uncured. By introducing a thermal initiator, UV / heat dual curing is achieved.

[0046] Step 5, pour the resin into the mold, lay the unimpregnated woven glass fiber, pour the resin after the woven glass fiber is completely impregnated, then lay the second layer of unimpregnated woven glass fiber 4, pour the resin after the woven glass fiber is completely impregnated, then lay a layer of woven glass fiber 3 with copper electrodes 2 attached and impregnated with multi-walled carbon nanotubes, and finally pour the resin on the top; then put the whole into a vacuum barrel, place it under a pressure of -100PSI for 1 hour, and then take it out to obtain a preform.

[0047] Step 6: Curing the preform under UV light for 10 minutes. After the UV curing process is completed, the specimen is immediately placed in a 150°C oven for heat curing for 20 minutes. Finally, it is demoulded after cooling to room temperature, and the specimen is cut into the required size. The specimen is subjected to a temperature test. Figure 3 and Figure 4 shown.

[0048] Reference Figure 2 The inner wall of the pipeline 7 is made of UV-CIPP composite material. The data collector 5 transmits the collected information to the remote control center 9 to determine whether the water 8 in the pipeline 7 is leaking.

[0049] The present invention adopts ultraviolet light / heat dual curing to enhance the curing degree of the material and achieve excellent mechanical properties; at the same time, the introduced MWCNTs sensing layer has excellent sensing performance, which can not only repair the pipeline and enhance the performance of the pipeline, but also realize online real-time monitoring of the water temperature and damage of the pipeline, and has ultra-high sensitivity, opening up a new path for intelligent pipeline monitoring.

[0050] Example 1

[0051] 1) The carboxylation treated MWCNTs solution was prepared by the following steps:

[0052] 192 ml of deionized water and 8 g of a 5% carboxyl-treated MWCNTs solution were stirred and mixed evenly, and stirred at 1000 R / min for 30 min in a high-speed stirrer to form 200 ml of a 0.2% mass fraction MWCNTs solution, that is, a carboxyl-treated MWCNTs solution.

[0053] 2) The thermal initiator is prepared by the following steps:

[0054] 0.5 g of 98.5% tert-butyl perbenzoate (TBPB) solution and 1 g of dibenzoyl peroxide (BPO) powder are stirred and mixed evenly to obtain a thermal initiator.

[0055] Example 2

[0056] 1) The carboxylation treated MWCNTs solution was prepared by the following steps:

[0057] 180 ml of deionized water and 20 g of a 5% carboxyl-treated MWCNTs solution were stirred and mixed evenly, and stirred at 1000 R / min for 30 min in a high-speed stirrer to form 200 ml of a 0.5% mass fraction MWCNTs solution, that is, a carboxyl-treated MWCNTs solution.

[0058] 2) The thermal initiator is prepared by the following steps:

[0059] 0.5 g of 98.5% tert-butyl perbenzoate (TBPB) solution and 1 g of dibenzoyl peroxide (BPO) powder are stirred and mixed evenly to obtain a thermal initiator.

[0060] Example 3

[0061] 1) The carboxylation treated MWCNTs solution was prepared by the following steps:

[0062] 172 ml of deionized water and 28 g of a 5% carboxyl-treated MWCNTs solution were stirred and mixed evenly, and stirred at 1000 R / min for 30 min under a high-speed stirrer to form 200 ml of a 0.7% mass fraction MWCNTs solution, that is, a carboxyl-treated MWCNTs solution.

[0063] 2) The thermal initiator is prepared by the following steps:

[0064] 0.5 g of 98.5% tert-butyl perbenzoate (TBPB) solution and 1 g of dibenzoyl peroxide (BPO) powder are stirred and mixed evenly to obtain a thermal initiator.

[0065] Example 4

[0066] 1) The carboxylation treated MWCNTs solution was prepared by the following steps:

[0067] 160 ml of deionized water and 40 g of a 5% carboxyl-treated MWCNTs solution were stirred and mixed evenly, and stirred at 1000 R / min for 30 min in a high-speed stirrer to form 200 ml of a 1.0% mass fraction MWCNTs solution, that is, a carboxyl-treated MWCNTs solution.

[0068] 2) The thermal initiator is prepared by the following steps:

[0069] 0.5 g of 98.5% tert-butyl perbenzoate (TBPB) solution and 1 g of dibenzoyl peroxide (BPO) powder are stirred and mixed evenly to obtain a thermal initiator.

[0070] The present invention uses woven glass fiber and ultraviolet light curing resin as the matrix material, and adds MWCNTs and various additives on this basis to further improve the mechanical properties, sensing properties and stability of the material. The pipeline repair and water level intelligent monitoring material of the present invention has high strength, high sensitivity and high stability, and has great potential and application prospects in pipeline repair, structural health monitoring, and pipeline water temperature and water level monitoring.

[0071] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A UV-CIPP material for pipeline repair and water level intelligent monitoring, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of UV-curable resin, 10-15 parts of woven glass fiber, 30-33 parts of curing agent, 200 parts of carboxyl-treated MWCNTs solution, and 1.5 parts of thermal initiator; The carboxylation treated MWCNTs solution is prepared by the following steps: Step A, mixing deionized water with a 5% carboxyl-treated MWCNTs solution, and stirring evenly to form an impregnation solution, i.e., a carboxyl-treated MWCNTs solution; The thermal initiator is prepared by the following steps: Step B: Stir and mix 98.5% tert-butyl perbenzoate (TBPB) solution and dibenzoyl peroxide (BPO) powder to obtain a thermal initiator.

2. The UV-CIPP material for pipeline repair and water level intelligent monitoring according to claim 1, characterized in that: In step B, the usage ratio of 98.5% concentration of tert-butyl perbenzoate (TBPB) solution and dibenzoyl peroxide (BPO) powder is 0.5g:1g.

3. A method for preparing the UV-CIPP material for pipeline repair and water level intelligent monitoring according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1, selecting appropriate amounts of carboxyl-treated MWCNTs solutions with different mass fractions as impregnation solutions; S2, soaking the woven glass fiber in the impregnation solution for a period of time, and then taking it out and drying it; S3, applying conductive silver glue on both ends of the dried woven glass fiber, and pasting copper electrodes after the conductive silver glue is solidified; S4, adding the thermal initiator to the ultraviolet curing resin, mixing well and placing in a vacuum barrel; S5, pour the resin into the mold, lay the woven glass fiber, wait until the woven glass fiber is completely impregnated, then pour the resin, then lay the second layer of woven glass fiber, repeat the operation until the third layer of woven glass fiber is laid, and finally pour the resin on the top; then put the test piece into a vacuum barrel, place it under a pressure of -100PSI for 1 hour, and then take it out to obtain a prefabricated part; S6, UV curing and heat curing the prefabricated part in sequence, demoulding the prefabricated part after cooling to room temperature, and completing the preparation of the test piece.

4. The method for preparing the UV-CIPP material for pipeline repair and water level intelligent monitoring according to claim 3, characterized in that: In step S1, the usage ratio of deionized water and 5% carboxylation-treated MWCNTs solution is 160-192 ml: 8-40 g.

5. The method for preparing UV-CIPP material for pipeline repair and water level intelligent monitoring according to claim 3, characterized in that: The stirring process in step S1 is: stirring at 1000 R / min for 30 min under a high-speed stirrer.

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