Photocuring-moisture curing dual-response pipeline lining repair resin and synthesis method thereof, lining hose and preparation method and construction method thereof

Abstract

The invention belongs to the technical field of pipeline repair materials, and particularly relates to photocuring-moisture curing dual-response type pipeline lining repair resin and a synthesis method thereof, a lining hose and a preparation method and a construction method thereof. The repair resin comprises the following components in parts by weight: 40-60 parts of matrix resin A; 20 to 35 parts of matrix resin B; 10 to 20 parts of a reactive diluent; 1.5 to 3.0 parts of a photoinitiator A; 0.5 to 1.5 parts of a photoinitiator B; 0.05 to 0.2 part of a moisture sensitive accelerant; 0.5 to 2.0 parts of a coupling agent; 1.0 to 3.0 parts of a thixotropic agent; 0.2 to 0.5 part of an antioxidant; wherein the matrix resin A is an aliphatic polyurethane acrylate prepolymer; the matrix resin B is an isocyanate terminated polyether prepolymer; the photoinitiator A is 2, 4, 6-trimethylbenzoyl-diphenyl phosphine oxide; and the photoinitiator B is 1-hydroxycyclohexyl phenyl ketone. The invention provides photocuring-moisture curing dual-response type pipeline lining repairing resin and a synthesis method thereof, a lining hose and a preparation method and a construction method thereof.

Description

Technical Field

[0001] This invention belongs to the field of pipeline repair materials technology, and specifically relates to a light-curing-moisture-curing dual-response pipeline lining repair resin and its synthesis method, lining hose and its preparation method and construction method. Background Technology

[0002] Underground pipe networks are a crucial component of urban infrastructure, undertaking critical functions such as drainage, water supply, and gas transmission. As these networks age, pipes commonly exhibit defects such as corrosion perforation, joint detachment, structural cracks, and localized collapses. Traditional open-cut repair methods suffer from long construction periods, significant traffic disruption, and high overall costs. In-situ solidification lining, a representative trenchless repair technology, repairs pipes by forming a structural lining inside the existing pipeline. It offers advantages such as rapid construction, minimal traffic impact, and reliable repair quality.

[0003] The core of CIPP repair technology lies in the rapid and complete curing reaction of the resin system impregnated in the inner lining hose within the pipe. Based on different curing mechanisms, existing CIPP repair technologies are mainly classified into the following categories: Thermosetting system: This system uses unsaturated polyester resin or vinyl ester resin, and initiates a free radical polymerization reaction by decomposing a peroxide initiator through hot water circulation or steam heating. This system is technically mature, but requires boiler equipment, resulting in high energy consumption, and poses a risk of burns during the heating process.

[0004] UV-curing system: This system uses vinyl ester or acrylate resins containing photosensitive groups. UV light irradiation activates a photoinitiator, generating free radicals to initiate the polymerization reaction. This system cures quickly (typically 30-60 minutes), but uneven light exposure can lead to incomplete curing.

[0005] Room temperature self-curing system: This system uses two-component epoxy resin or polyurethane resin, which is cured through a chemical reaction after being mixed in a stoichiometric ratio. This system has low equipment requirements, but the curing time is long (usually 12-24 hours), and there is a problem with high requirements for the accuracy of the mixing ratio.

[0006] Deficiencies of existing technology: UV-curing blind zone issue: Existing UV-cured linings exhibit significant curing blind zones at pipe bends (bending angle > 22.5°), reducers, and branch pipe interfaces due to limitations in the light source angle and insufficient light diffraction. Actual measurement data shows that the curing degree inside a 90° bend is only 40-60% of that in straight pipe sections, posing a serious quality hazard.

[0007] Problem of insufficient deep curing: The photocuring reaction depends on photon energy to activate the initiator, and the light intensity decreases exponentially with the thickness of the resin layer. According to the Lambert-Beer law, when the inner liner wall thickness exceeds 5 mm, the light intensity received by the inner resin layer is insufficient to effectively initiate the polymerization reaction, resulting in the inner liner exhibiting a curing gradient of "hard on the outside and soft on the inside".

[0008] The conflict between construction efficiency and curing quality: To address the issue of blind spots in photocuring, existing technologies typically involve extending the light exposure time or adding thermal initiators. However, extending the light exposure time significantly reduces construction efficiency; adding thermal initiators requires additional heating equipment, increasing construction complexity and cost.

[0009] Insufficient environmental adaptability: The photoinitiation efficiency of existing photocuring systems is temperature-sensitive, and the initiation efficiency decreases significantly at low temperatures (<10℃). Meanwhile, the reaction rate of existing moisture-curing systems is closely related to ambient humidity and temperature, and the curing speed drops drastically in dry or low-temperature environments. Summary of the Invention

[0010] In order to solve the above-mentioned problems in the existing technology, the purpose of this invention is to provide a photocurable-moisture curable dual-response pipe lining repair resin and its synthesis method, lining hose and its preparation method and construction method.

[0011] The technical solution adopted in this invention is as follows: This is a dual-response (photocurable / moisture-curable) pipe lining repair resin, comprising the following components by weight: Main resin A: 40-60 parts; Main resin B: 20-35 parts; Reactive diluent: 10-20 parts; Photoinitiator A: 1.5-3.0 parts; Photoinitiator B: 0.5-1.5 parts; Moisture-sensitive accelerator: 0.05-0.2 parts; Coupling agent: 0.5-2.0 parts; Thixotropic agent: 1.0-3.0 parts; Antioxidant: 0.2-0.5 parts. The main resin A is an aliphatic polyurethane acrylate prepolymer; the main resin B is an isocyanate-terminated polyether prepolymer; the reactive diluent is tripropylene glycol diacrylate; the photoinitiator A is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide; the photoinitiator B is 1-hydroxycyclohexylphenyl ketone; the moisture-sensitive promoter is dibutyltin dilaurate; the coupling agent is γ-aminopropyltriethoxysilane; and the thixotropic agent is organically modified bentonite.

[0012] As a preferred embodiment of the present invention, the aliphatic polyurethane acrylate prepolymer is synthesized from the following components: isophorone diisocyanate, polytetrahydrofuran ether diol, hydroxyethyl acrylate, dibutyltin dilaurate, and hydroquinone. The molar ratio of isophorone diisocyanate, polytetrahydrofuran ether diol, and hydroxyethyl acrylate is 2.0:1.0:2.0, the mass percentage of dibutyltin dilaurate is 0.03%, and the mass percentage of hydroquinone is 0.05%.

[0013] As a preferred embodiment of the present invention, the isocyanate-terminated polyether prepolymer is synthesized from the following components in the following molar ratio: modified MDI: polyether polyol = (2.2-2.5): 1.0.

[0014] A method for synthesizing a photocurable-moisture-curable dual-response pipe lining repair resin includes the following steps: S1: Feeding of main resin A: In a light-proof environment with RH≤50%, the aliphatic polyurethane acrylate prepolymer is metered into a clean and dry mixing tank, the frame agitator is turned on, and the circulating cooling water is used to maintain the material temperature at 25±3℃. S2: Addition of reactive diluent: Add the reactive diluent slowly at a rate of 5-10% / min relative to the mass of the main resin A; measure the viscosity of the mixture after stirring for 15-20 minutes. S3: Photoinitiator dissolution: Under light-protected conditions, add photoinitiator A and photoinitiator B sequentially; since both initiators are solids at room temperature, they need to be added by pre-dissolution or direct high-shear dispersion. S4: Main Resin B Feeding: Isocyanate-terminated polyether prepolymer is added under low humidity conditions; S5: Addition of functional additives: Thixotropic agent, coupling agent and antioxidant are added in sequence, and high-speed dispersion is used to make them evenly dispersed; S6: Catalyst addition and discharge: Finally, add the moisture-sensitive accelerator and stir at low speed to disperse it evenly.

[0015] As a preferred embodiment of the present invention, in step S1, the synthesis of the aliphatic polyurethane acrylate prepolymer includes the following steps: S11: Isophorone diisocyanate feeding and nitrogen purging: Add isophorone diisocyanate to a clean and dry reactor according to the metering, start stirring, and purge the air in the reactor with nitrogen for more than 30 minutes; raise the temperature to 40℃ and maintain it, and proceed to the next step only after the oxygen content in the reactor is ≤0.5%; S12: Dehydration and drip addition of polytetrahydrofuran ether diol: Add polytetrahydrofuran ether diol to a dehydration vessel and dehydrate it for 2-3 hours at 60°C and a vacuum degree ≤3.0kPa until the moisture content is ≤0.05%; after heating the dehydrated polytetrahydrofuran ether diol to 50°C, slowly add it dropwise to the reaction vessel, controlling the drip rate to ensure that the temperature inside the vessel does not exceed 60°C; S13: Prepolymerization reaction: After the addition is complete, heat to 70℃, add dibutyltin dilaurate catalyst, and react for 3-4 hours; take samples every 30 minutes to determine the -NCO content; S14: Hydroxyethyl acrylate capping reaction: Cool the temperature to 50℃, add the polymerization inhibitor hydroquinone, and stir for 10 minutes to disperse it evenly; then slowly add hydroxyethyl acrylate dropwise, maintaining the temperature at 50-55℃ during the dropwise addition, and continue the reaction for 2-3 hours after the dropwise addition is complete. S15: Post-processing and discharge: Cool down to below 40℃, remove residual solvent and low-boiling substances for 15-20 minutes under vacuum degree ≤3.0kPa, then purge with nitrogen to atmospheric pressure, and discharge into a clean, dry, sealed container.

[0016] As a preferred embodiment of the present invention, in step S4, the synthesis of the isocyanate-terminated polyether prepolymer includes the following steps: S41: Modified MDI feeding and preheating: High-purity nitrogen gas is introduced into a clean and dry reactor for more than 30 minutes to replace the oxygen content in the reactor ≤0.3% and the dew point ≤-40℃; Modified MDI is metered into the reactor, stirring is started, and the temperature is raised to 50℃ and maintained. S42: Dehydration treatment of polyether polyol: The polyether polyol is put into a dehydration kettle and dehydrated for more than 3 hours at 80℃ and vacuum degree ≤1.0kPa; nitrogen bubbling is used to assist in the removal of dissolved water during the dehydration process; the dehydration endpoint: moisture content ≤0.03%; S43: Prepolymerization reaction: The dehydrated polyether polyol is heated to 60°C and added to the MDI reactor in a continuous feeding manner through a metering pump; the flow rate is controlled to ensure that the material temperature does not exceed 70°C, and the reaction is carried out at 70°C for 2 hours after the addition is completed. S44: Post-processing and discharge: After the reaction reaches the endpoint, i.e. the -NCO content is within the target range of 6-10%, cool down to 40℃ and discharge into a pre-dried and nitrogen-filled sealed container under slight positive pressure nitrogen protection; maintain a nitrogen flow rate of more than 0.5L / min during the discharge process.

[0017] The light-curing and moisture-curing dual-response pipe liner hose includes, from the inside out, an inner protective film layer, a dual-curing resin impregnation layer, a glass fiber reinforcement layer, and an outer protective film layer; The outer protective film is made of polyethylene / polyamide co-extruded or composite film, the glass fiber reinforcement layer is made of alkali-free glass fiber needle-punched felt, and the inner protective film is made of biaxially oriented polyethylene terephthalate.

[0018] A method for preparing a light-curing-moisture-curing dual-response pipe liner hose includes the following steps: Y1: Tube body sewing: Alkali-free fiberglass needle-punched felt is cut, inner protective film layer is cut, outer protective film layer is cut, inner protective film layer is heat-sealed into a tube, alkali-free fiberglass needle-punched felt is wrapped, outer protective film layer is wrapped and heat-sealed; Y2: Vacuum infusion of resin: tubing pretreatment, resin preheating, resin metering, vacuum evacuation, resin introduction, and maintaining vacuum; Y3: Rolling and defoaming: Multi-roller continuous rolling or reciprocating rolling, rolling pressure 0.1-0.3Mpa, rolling speed 0.5-1.5m / min, rolling times ≥3 times, rolling temperature 15-30℃, the point at which no obvious bubbles are visible through the inner membrane is taken as the defoaming endpoint; Y4: Quality inspection and packaging.

[0019] The construction method for a dual-response pipe lining hose that combines light-curing and moisture-curing includes the following steps: T1: Construction Preparation Stage Preliminary unblocking: mechanical or hydraulic unblocking; High-pressure water jet cleaning: pressure 15-25MPa, nozzle speed 200-500rpm; Number of cleaning passes: ≥2 passes; Cleaning speed: 2-5m / min; Drainage and drying: natural drainage or forced drainage; CCTV inspection: full video recording, defects recorded; T2: Liner Installation Stage Tilting installation: pneumatic tilting, hydraulic tilting, combined pneumatic and hydraulic tilting, or traction installation; Quality control during the flipping process: Flipping pressure: set value ±10%; Flipping speed: uniform and stable; Flipping length: consistent with the design length; Flipping resistance: no abnormal peaks; Hose integrity: no damage or wrinkles; After flipping into place, maintain pressure and adhere: Pressure holding pressure: flipping pressure × (80-100%); Pressure holding time: ≥15min; Temperature control: 15-35℃; Pressure monitoring: continuous monitoring, record once every 5min; T3: Light curing stage: Start the UV / visible light curing equipment; send the light curing lamp cart into the inner liner tube and cure it by moving it at a constant speed; T4: Post-curing stage: After light curing, maintain the air / water pressure inside the lining and introduce humid air for post-curing. T5: Port treatment and inspection: After post-curing, remove the pressure, cut off the excess inner lining reserved at both ends, and perform port treatment.

[0020] As a preferred embodiment of the present invention, a curing degree gradient control technology is employed, specifically including the following steps: Initiator gradient distribution design: During the fabrication of the inner lining tube, a layered injection process is adopted to make the concentration of photoinitiator gradient distributed in the direction of inner lining thickness; Moisture permeation promotion design: The inner protective membrane layer adopts a microporous breathable membrane, which ensures the stability of the resin before construction, while allowing environmental moisture to permeate into the resin layer through the micropores after construction, thus accelerating the moisture curing reaction in the inner layer area. Temperature-assisted control technology: For construction in low-temperature environments during winter, warm and humid air is introduced during the post-curing stage of moisture to improve the moisture penetration rate and reaction rate.

[0021] The beneficial effects of this invention are as follows: 1. The key technology of this invention lies in achieving synergistic complementarity between photocuring and moisture curing mechanisms within the same resin system. Aliphatic polyurethane acrylate prepolymers provide photocurability; their acrylate end groups respond to ultraviolet / visible light irradiation and rapidly undergo free radical polymerization under the action of a photoinitiator, forming a preliminary crosslinked network. Isocyanate-terminated polyether prepolymers retain active isocyanate groups, enabling them to react with moisture in the air to form urea bonds, allowing for continuous curing and crosslinking in areas with insufficient or inaccessible light.

[0022] 2. The synergistic effect of the two curing mechanisms is reflected in both time and space dimensions: In the time dimension, photocuring is fast (reaching touch dryness within minutes), quickly establishing the basic shape and initial strength of the lining; moisture curing is relatively slower but lasts longer, continuing for 4-8 hours to achieve complete curing of the resin system. In the spatial dimension, photocuring mainly occurs in areas accessible to light (the inner surface and shallow layers of the lining), while moisture curing can effectively cure in the deeper layers of the lining and light-deprived areas (elbows, diameter changes) through the penetration and diffusion of moisture in the resin.

[0023] 3. This invention employs a photoinitiator system composed of TPO and 184. TPO has a broad absorption spectrum (extending to the visible light region of 405 nm) and good adaptability to LED light sources, but it is prone to oxygen inhibition, leading to surface stickiness. 184 is a type I photoinitiator, and the benzoyl free radicals generated after its pyrolysis have high reactivity, resulting in good surface curing. The combination of these two initiators achieves the dual goals of rapid inner-layer polymerization and complete surface curing.

[0024] 4. Controlling the dosage of the moisture-sensitive accelerator DBTDL is also crucial. Too low a dosage results in a slow moisture-curing reaction, preventing complete curing within a reasonable timeframe; too high a dosage may cause prepolymerization of the resin system during storage, shortening the shelf life. This invention controls the DBTDL dosage within the range of 0.05-0.2 parts by weight, ensuring a 3-month shelf life while achieving a post-curing cycle of 4-8 hours.

[0025] 5. This invention adopts a segmented curing construction method, which first establishes the main structure of the inner lining through light curing, and then supplements the curing of light-blind areas and deep areas through moisture post-curing, as well as the parameter control range of each process in this process.

[0026] 6. The present invention employs a curing degree gradient control technology, including the gradient distribution design of photoinitiator in the thickness direction of the inner lining, the moisture permeability design of the outer protective film layer, and the temperature and humidity control parameters in the post-curing stage. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the inner lining hose structure; Figure 2 This is a flowchart of the segmented curing construction process; Figure 3 This is a longitudinal sectional view of the pipeline; Figure 4 This is a cross-sectional view of the lighting vehicle. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0030] I. Composition and Design Principles of Resin Systems The photocurable-moisture-curable dual-response pipe lining repair resin system provided by this invention is composed of the following components.

[0031] Table 1 shows the components of the dual-response pipe lining repair resin system that combines light-curing and moisture-curing.

[0032]

[0033] Design principle explanation: The core of this invention lies in introducing photocurable active groups (acrylate double bonds) and moisture-curable active groups (isocyanate groups) into the same resin system. The aliphatic polyurethane acrylate prepolymer has a polyurethane structure as its main chain and acrylate end groups, which can undergo free radical polymerization in response to light. The isocyanate-terminated polyether prepolymer retains active -NCO groups, which can react with moisture in the air to generate urea bonds and achieve cross-linking and curing.

[0034] The synergistic effect of the two curing mechanisms is reflected in the following: in the light-exposed area, a preliminary cross-linked network is rapidly formed through photocuring, establishing the basic shape and strength of the lining; subsequently, the isocyanate groups remaining in the resin continue to react with the ambient moisture, achieving supplementary curing in the light-blind area and the inner layer area, ensuring the complete curing of the lining as a whole.

[0035] II. Resin Synthesis Process 2.1 Synthesis of Aliphatic Polyurethane Acrylic Prepolymer Table 2 shows the raw material ratios for aliphatic polyurethane acrylate prepolymers.

[0036]

[0037] Synthesis steps and detailed parameters: Step 1: IPDI feeding and nitrogen purging Add the measured amount of IPDI into a clean, dry reactor, start stirring (100 rpm), and purge the reactor with nitrogen gas (flow rate 1.0 L / min) to replace the air inside for at least 30 minutes. Raise the temperature to 40°C and maintain it. Proceed to the next step only after the oxygen content inside the reactor is ≤0.5%.

[0038] Step 2: PTMEG dehydration and drip addition PTMEG was added to a dehydration vessel and dehydrated for 2-3 hours at 60°C and a vacuum of ≤3.0 kPa until the moisture content was ≤0.05% (Kal Fischer method). The dehydrated PTMEG was then heated to 50°C and slowly added dropwise to the reaction vessel, with the dropping rate controlled to ensure that the temperature inside the vessel did not exceed 60°C.

[0039] Step 3: Prepolymerization reaction After the addition is complete, the temperature is raised to 70℃, and the DBTDL catalyst is added (in the form of a 10% toluene solution for easy and uniform dispersion). The reaction is carried out for 3-4 hours. Samples are taken every 30 minutes to determine the NCO content.

[0040] Prepolymerization endpoint determination: The -NCO content reaches 50% ± 2% of the theoretical value, that is, on average, one of the two -NCO groups in IPDI has reacted with the -OH of PTMEG, and the other is reserved for subsequent HEA end capping.

[0041] Step 4: HEA capping reaction Cool to 50°C, add polymerization inhibitor HQ (in the form of a 2% toluene solution), and stir for 10 minutes to disperse it evenly. Then slowly add HEA dropwise, maintaining the temperature at 50-55°C during the dropwise addition. After the dropwise addition is complete, continue the reaction for 2-3 hours.

[0042] Step 5: Post-processing and discharge Cool down to below 40℃, remove residual solvent and low-boiling substances for 15-20 minutes under vacuum of ≤3.0kPa, then purge with nitrogen to atmospheric pressure and discharge into a clean, dry, sealed container.

[0043] 2.2 Synthesis of isocyanate-terminated polyether prepolymers Table 3 shows the raw material ratio.

[0044]

[0045] Synthesis steps and detailed parameters: Step 1: MDI feeding and preheating High-purity nitrogen gas is purged into a clean and dry reactor for at least 30 minutes to purge the oxygen content and ensure that the oxygen content inside the reactor is ≤0.3% and the dew point is ≤-40℃. Liquid MDI is metered into the reactor, stirring is started (80-100 rpm), and the temperature is raised to 50℃ and maintained.

[0046] Step 2: PPG dehydration treatment PPG was added to a dehydration vessel and dehydrated for at least 3 hours at 80°C and a vacuum of ≤1.0 kPa. Nitrogen bubbling (flow rate 0.5 L / min·kg) was used to assist in removing dissolved water during the dehydration process. The dehydration endpoint was achieved with a moisture content ≤0.03% (Karl Fischer process).

[0047] Step 3: Prepolymerization reaction The dehydrated PPG was heated to 60°C and added to the MDI reactor in a continuous feeding manner using a metering pump. The flow rate was controlled to ensure that the material temperature did not exceed 70°C, and the reaction was carried out at 70°C for 2 hours after the addition was completed.

[0048] Table 4 shows the reaction stages of the prepolymerization reaction.

[0049]

[0050] Step 4: Post-processing and discharge After the reaction reaches its endpoint (-NCO content within the target range of 6-10%), the temperature is lowered to 40℃, and the material is discharged into a pre-dried, nitrogen-filled, sealed container under slight positive pressure nitrogen protection. During the discharge process, the nitrogen flow rate is maintained at above 0.5 L / min to prevent moisture from the air from entering.

[0051] III. Resin System Formulation Process The two prepolymers synthesized above were mixed in proportion, and various functional additives were added to prepare the final dual-responsive repair resin.

[0052] Table 5 shows the equipment requirements for preparation.

[0053]

[0054] Preparation steps and detailed parameters: Step 1: Feeding of main resin A In a light-protected, low-humidity (RH≤50%) environment, the aliphatic polyurethane acrylate prepolymer is metered and added into a clean and dry mixing tank. The frame agitator is turned on (100-150 rpm), and the circulating cooling water is used to maintain the material temperature at 25±3℃.

[0055] Table 6 is the control table for the feeding process of main resin A.

[0056]

[0057] Step 2: Adding the active diluent Slowly add the reactive diluent TPGDA at a rate of 5-10% (relative to the mass of the bulk resin) per minute. After stirring for 15-20 minutes, measure the viscosity of the mixture and adjust the amount of TPGDA accordingly.

[0058] Step 3: Dissolving the photoinitiator Under light-protected conditions, photoinitiators TPO and 184 are added sequentially. Since both initiators are solids at room temperature, they must be added using either pre-dissolution or direct high-shear dispersion.

[0059] Method 1: Pre-dissolution method (recommended) Table 7 shows the operation steps for Method 1.

[0060]

[0061] Method 2: Direct Dispersion Method Table 8 shows the operation steps for Method 2.

[0062]

[0063] Step 4: Addition of isocyanate prepolymer In a low-humidity environment, add isocyanate-terminated polyether prepolymer. This step needs to be completed quickly to minimize contact between the prepolymer and moisture in the air.

[0064] Step 5: Addition of functional additives Thixotropic agent (organically modified bentonite), coupling agent (KH550), and antioxidant (1010) are added in sequence, and high-speed dispersion is used to make them uniformly dispersed.

[0065] Step 6: Catalyst addition and discharge Finally, add the moisture-sensitive accelerator DBTDL and stir at low speed to ensure even dispersion. After this step, the material should be discharged and packaged as soon as possible to minimize contact time with air.

[0066] Table 9 is the process control table for catalyst addition and discharge.

[0067]

[0068] IV. Design and Manufacturing Process of Inner Lined Tube The inner-lined flexible tube structure (from the inside to the outside) used in this invention is as follows: Figure 1 As shown.

[0069] 4.1 Material Specifications for Each Layer 4.2 Manufacturing process of inner-lined hose Preparation steps and detailed parameters: Step 1: Sew the hose body Table 10 shows the process steps for the first step.

[0070]

[0071] Step 2: Vacuum infusion of resin Table 11 shows the process steps for the second step.

[0072]

[0073] Table 12 shows the formula and reference values ​​for calculating resin injection volume.

[0074]

[0075] (Note: ρ_f is the surface density of fiberglass felt (kg / m²), D is the pipe diameter (m), and L is the hose length (m)) Step 3: Crushing and De-foaming Table 13 shows the process steps for the third step.

[0076]

[0077] V. Segmented Curing Construction Method The construction method provided by this invention is a segmented curing process of "first curing the main body with light, then curing the blind area with moisture". The segmented curing construction process is as follows: Figure 2 As shown.

[0078] 5.1 Construction Preparation Stage Table 14 is a detailed process table for pipeline pretreatment.

[0079]

[0080] Table 15 shows the detailed parameters for the lining hose injection process.

[0081]

[0082] 5.2 Lining Installation Stage Table 16 shows the options for flip-mounting.

[0083]

[0084] Fold the filled inner lining hose into a U-shape or flatten it, and insert it into the inverting device. The inverting pressure is determined according to the pipe diameter and hose thickness.

[0085] Table 17 shows the pressure-holding and bonding table after flipping into place.

[0086]

[0087] 5.3 Photocuring stage Start the UV / visible light curing equipment. This invention recommends using an LED light source (main wavelength 395-405nm) with a power density of 80-150mW / cm². Place the curing lamp cart into the inner liner tube and cure it at a uniform speed. Figure 3 This is a longitudinal sectional view of the pipeline; Figure 4 This is a cross-sectional view of the lighting vehicle.

[0088] 5.4 Post-moisture curing stage After light curing, maintain the air / water pressure inside the lining while introducing humid air for post-curing.

[0089] Table 18 is the configuration table for the moisture-curing system.

[0090]

[0091] During the post-curing stage, the residual isocyanate groups in the resin react with moisture to form a urea bond crosslinking structure: R-NCO+H2O→R-NH-CO-NH-R' (urea bond)+CO2↑.

[0092] The CO2 gas released by the reaction has no adverse effect on the mechanical properties of the lining; on the contrary, it helps to drive the penetration of moisture in the thickness direction of the lining.

[0093] 5.5 Port Processing and Verification After post-curing, the pressure is removed, the excess inner lining reserved at both ends is cut off, and the ends are treated.

[0094] Table 19 shows the port processing technology.

[0095] VI. Curing Degree Gradient Control Technology To achieve uniform curing degree of the lining, the present invention provides the following gradient control technology measures: 6.1 Design of photoinitiator gradient distribution During the preparation of the inner lining hose, a layered injection process is adopted to make the concentration of photoinitiator gradient in the thickness direction of the inner lining.

[0096] Gradient distribution design principle: According to Lambert-Beer's law, light intensity decreases exponentially with penetration depth: I(x) = I0 × exp(-α × x). Where I0 is the incident light intensity, x is the penetration depth, and α is the absorption coefficient. To compensate for the effect of light intensity attenuation on the degree of curing, an initiator concentration gradient with higher concentration at the outside and lower concentration at the inside is adopted.

[0097] Table 20 is a gradient formulation design table.

[0098]

[0099] Table 21 shows the implementation method of stratified grouting.

[0100]

[0101] 6.2 Moisture Infiltration Enhancement Design The inner protective membrane layer (microporous BOPET) uses a microporous breathable membrane, which ensures the stability of the resin before construction while allowing environmental moisture to penetrate into the resin layer through the micropores after construction, thus accelerating the moisture curing reaction in the inner layer area.

[0102] Table 22 shows the activation methods for the breathable membrane.

[0103]

[0104] 6.3 Temperature-assisted control technology For construction in low-temperature environments during winter, warm and humid air can be introduced during the post-curing stage to increase the moisture penetration rate and reaction rate.

[0105] Table 23 shows the curing scheme after heating in a low-temperature environment.

[0106]

[0107] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A dual-response pipe lining repair resin that combines light-curing and moisture-curing properties, characterized in that: It includes the following components in parts by weight: Main resin A: 40-60 parts; Main resin B: 20-35 parts; Reactive diluent: 10-20 parts; Photoinitiator A: 1.5-3.0 parts; Photoinitiator B: 0.5-1.5 parts; Moisture-sensitive accelerator: 0.05-0.2 parts; Coupling agent: 0.5-2.0 parts; Thixotropic agent: 1.0-3.0 parts; Antioxidant: 0.2-0.5 parts; The main resin A is an aliphatic polyurethane acrylate prepolymer; the main resin B is an isocyanate-terminated polyether prepolymer; the reactive diluent is tripropylene glycol diacrylate; the photoinitiator A is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide; the photoinitiator B is 1-hydroxycyclohexylphenyl ketone; the moisture-sensitive promoter is dibutyltin dilaurate; the coupling agent is γ-aminopropyltriethoxysilane; and the thixotropic agent is organically modified bentonite.

2. The photocurable-moisture-curable dual-response pipe lining repair resin according to claim 1, characterized in that: The aliphatic polyurethane acrylate prepolymer is synthesized from the following components: isophorone diisocyanate, polytetrahydrofuran ether diol, hydroxyethyl acrylate, dibutyltin dilaurate, and hydroquinone. The molar ratio of isophorone diisocyanate, polytetrahydrofuran ether diol, and hydroxyethyl acrylate is 2.0:1.0:2.0, the mass percentage of dibutyltin dilaurate is 0.03%, and the mass percentage of hydroquinone is 0.05%.

3. The photocurable-moisture-curable dual-response pipe lining repair resin according to claim 1, characterized in that: The isocyanate-terminated polyether prepolymer is synthesized from the following components in the following molar ratio: modified MDI: polyether polyol = (2.2-2.5): 1.

0.

4. A method for synthesizing a photocurable-moisture-curable dual-response pipe lining repair resin, used to synthesize the photocurable-moisture-curable dual-response pipe lining repair resin according to any one of claims 1 to 3, characterized in that it includes the following steps: S1: Feeding of main resin A: In a light-proof environment with RH≤50%, the aliphatic polyurethane acrylate prepolymer is metered into a clean and dry mixing tank, the frame agitator is turned on, and the circulating cooling water is used to maintain the material temperature at 25±3℃. S2: Addition of reactive diluent: Add the reactive diluent slowly at a rate of 5-10% / min relative to the mass of the main resin A; measure the viscosity of the mixture after stirring for 15-20 minutes. S3: Photoinitiator dissolution: Under light-protected conditions, add photoinitiator A and photoinitiator B sequentially; since both initiators are solids at room temperature, they need to be added by pre-dissolution or direct high-shear dispersion. S4: Main Resin B Feeding: Isocyanate-terminated polyether prepolymer is added under low humidity conditions; S5: Addition of functional additives: Thixotropic agent, coupling agent and antioxidant are added in sequence and dispersed evenly using high-speed dispersion; S6: Catalyst addition and discharge: Finally, add the moisture-sensitive accelerator and stir at low speed to disperse it evenly.

5. The method for synthesizing the photocurable-moisture-curable dual-response pipe lining repair resin according to claim 4, characterized in that: In step S1, the synthesis of the aliphatic polyurethane acrylate prepolymer includes the following steps: S11: Isophorone diisocyanate feeding and nitrogen purging: Add isophorone diisocyanate to a clean and dry reactor according to the metering, start stirring, and purge the air in the reactor with nitrogen for more than 30 minutes; raise the temperature to 40℃ and maintain it, and proceed to the next step only after the oxygen content in the reactor is ≤0.5%; S12: Dehydration and drip addition of polytetrahydrofuran ether diol: Add polytetrahydrofuran ether diol to a dehydration vessel and dehydrate it for 2-3 hours at 60°C and a vacuum degree ≤3.0kPa until the moisture content is ≤0.05%; after heating the dehydrated polytetrahydrofuran ether diol to 50°C, slowly add it dropwise to the reaction vessel, controlling the drip rate to ensure that the temperature inside the vessel does not exceed 60°C; S13: Prepolymerization reaction: After the addition is complete, heat to 70℃, add dibutyltin dilaurate catalyst, and react for 3-4 hours; take samples every 30 minutes to determine the -NCO content; S14: Hydroxyethyl acrylate capping reaction: Cool the temperature to 50℃, add the polymerization inhibitor hydroquinone, and stir for 10 minutes to disperse it evenly; then slowly add hydroxyethyl acrylate dropwise, maintaining the temperature at 50-55℃ during the dropwise addition, and continue the reaction for 2-3 hours after the dropwise addition is complete. S15: Post-processing and discharge: Cool down to below 40℃, remove residual solvent and low-boiling substances for 15-20 minutes under vacuum degree ≤3.0kPa, then purge with nitrogen to atmospheric pressure, and discharge into a clean, dry, sealed container.

6. The method for synthesizing the photocurable-moisture-curable dual-response pipe lining repair resin according to claim 4, characterized in that: In step S4, the synthesis of the isocyanate-terminated polyether prepolymer includes the following steps: S41: Modified MDI feeding and preheating: High-purity nitrogen gas is introduced into a clean and dry reactor for more than 30 minutes to replace the oxygen content in the reactor ≤0.3% and the dew point ≤-40℃; Modified MDI is metered into the reactor, stirring is started, and the temperature is raised to 50℃ and maintained. S42: Dehydration treatment of polyether polyol: The polyether polyol is put into a dehydration kettle and dehydrated for more than 3 hours at 80℃ and vacuum degree ≤1.0kPa; nitrogen bubbling is used to assist in the removal of dissolved water during the dehydration process; the dehydration endpoint: moisture content ≤0.03%; S43: Prepolymerization reaction: The dehydrated polyether polyol is heated to 60°C and added to the MDI reactor in a continuous feeding manner through a metering pump; the flow rate is controlled to ensure that the material temperature does not exceed 70°C, and the reaction is carried out at 70°C for 2 hours after the addition is completed. S44: Post-processing and discharge: After the reaction reaches the endpoint, i.e. the -NCO content is within the target range of 6-10%, cool down to 40℃ and discharge into a pre-dried and nitrogen-filled sealed container under slight positive pressure nitrogen protection; maintain a nitrogen flow rate of more than 0.5L / min during the discharge process.

7. A dual-response (photocurable-moisture-curable) pipe lining hose, using the dual-response (photocurable-moisture-curable) pipe lining repair resin according to any one of claims 1 to 3, characterized in that: It includes an inner protective film layer, a double-cured resin impregnation layer, a glass fiber reinforcement layer, and an outer protective film layer arranged sequentially from the inside to the outside; The outer protective film is made of polyethylene / polyamide co-extruded or composite film, the glass fiber reinforcement layer is made of alkali-free glass fiber needle-punched felt, and the inner protective film is made of biaxially oriented polyethylene terephthalate.

8. A method for preparing a photocurable-moisture-curable dual-response pipe liner hose, used to prepare the photocurable-moisture-curable dual-response pipe liner hose as described in claim 7, characterized in that: Includes the following steps: Y1: Tube body sewing: Alkali-free fiberglass needle-punched felt is cut, inner protective film layer is cut, outer protective film layer is cut, inner protective film layer is heat-sealed into a tube, alkali-free fiberglass needle-punched felt is wrapped, outer protective film layer is wrapped and heat-sealed; Y2: Vacuum infusion of resin: tubing pretreatment, resin preheating, resin metering, vacuum evacuation, resin introduction, and maintaining vacuum; Y3: Rolling and defoaming: Multi-roller continuous rolling or reciprocating rolling, rolling pressure 0.1-0.3Mpa, rolling speed 0.5-1.5m / min, rolling times ≥3 times, rolling temperature 15-30℃, the point at which no obvious bubbles are visible through the inner membrane is taken as the defoaming endpoint; Y4: Quality inspection and packaging.

9. A method for constructing a dual-response (photocurable-moisture-curable) pipe lining hose as described in claim 7, characterized in that: Includes the following steps: T1: Construction Preparation Stage Preliminary unblocking: mechanical or hydraulic unblocking; High-pressure water jet cleaning: pressure 15-25MPa, nozzle speed 200-500rpm; Number of cleaning passes: ≥2 passes; Cleaning speed: 2-5m / min; Drainage and drying: natural drainage or forced drainage; CCTV inspection: full video recording, defects recorded; T2: Liner Installation Stage Tilting installation: pneumatic tilting, hydraulic tilting, combined pneumatic and hydraulic tilting, or traction installation; Quality control during the flipping process: Flipping pressure: set value ±10%; Flipping speed: uniform and stable; Tilting length: consistent with design length; Tilting resistance: no abnormal peak; Hose integrity: no damage or wrinkles; After flipping into place, maintain pressure and adhere: Pressure holding pressure: flipping pressure × (80-100%); Pressure holding time: ≥15min; Temperature control: 15-35℃; Pressure monitoring: continuous monitoring, record once every 5min; T3: Light curing stage: Start the UV / visible light curing equipment; send the light curing lamp cart into the inner liner tube and cure it by moving it at a constant speed; T4: Moisture post-curing stage: After light curing, maintain the air / water pressure inside the lining, and introduce humid air for post-curing. T5: Port treatment and inspection: After post-curing, remove the pressure, cut off the excess inner lining reserved at both ends, and perform port treatment.

10. The construction method of the photocurable-moisture-curable dual-response pipe lining hose according to claim 9, characterized in that: The curing degree gradient control technology includes the following steps: Initiator gradient distribution design: During the fabrication of the inner lining tube, a layered injection process is adopted to make the concentration of photoinitiator gradient distributed in the direction of inner lining thickness; Moisture permeation promotion design: The inner protective membrane layer adopts a microporous breathable membrane, which ensures the stability of the resin before construction, while allowing environmental moisture to permeate into the resin layer through the micropores after construction, thus accelerating the moisture curing reaction in the inner layer area. Temperature-assisted control technology: For construction in low-temperature environments during winter, warm and humid air is introduced during the post-curing stage of moisture to improve the moisture penetration rate and reaction rate.

Images