Water supply composite pipe and its preparation process

Abstract

This invention relates to the field of CIPP repair pipe technology, and in particular to a water supply composite pipe and its manufacturing process. A water supply composite pipe includes a transparent inner pipe, double-sided adhesive-coated felt, fiberglass prepreg tape, and a polyolefin outer membrane. The fiberglass prepreg tape has a thickness of 2.0-4.0 mm. The double-sided adhesive-coated felt includes a UV heat-insulating layer, felt, and a UV adhesive layer. The felt is a 3.0-6.0 mm thick high-silica glass fiber felt or polyester needle-punched felt. The fiberglass prepreg tape includes UV prepreg and fiberglass fabric, with the prepreg accounting for 40-50 wt% of the total mass of the fiberglass prepreg tape. This invention can provide heat insulation for CIPP repairs of pipes, preventing the internal stress caused by alternating hot and cold temperatures from amplifying damage defects on the transparent inner pipe, thereby improving the quality of CIPP repairs of transparent inner pipes.

Description

Technical Field

[0001] This invention relates to the field of CIPP repair pipe technology, and in particular to a water supply composite pipe and its preparation process. Background Technology

[0002] Transparent water supply pipes include PVC (polyvinyl chloride), CPVC (chlorinated polyvinyl chloride), HDPE (high-density polyethylene), TPU (thermoplastic polyurethane), and polycarbonate (PC). When these transparent water supply pipes develop cracks or other damage, they need to be repaired promptly. CIPP repair technology, also known as trenchless repair technology, is used to repair damaged pipes and extend the service life of transparent water supply pipes.

[0003] Currently, the CIPP repair technology for repairing transparent water supply pipes mainly involves UV resin impregnation with fiberglass tape followed by multiple UV curing processes. This method has the following drawbacks: 1. Low repair efficiency; 2. Damaged areas of transparent water supply pipes are easily affected by external factors or the transported liquid. The internal stress generated by alternating hot and cold temperatures amplifies cracks and fissures in the pipes, leading to a less than ideal service life after repair. Further improvements are needed. Therefore, the inventors have provided a composite water supply pipe and its manufacturing process. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a composite water supply pipe and its manufacturing process.

[0005] The water supply composite pipe provided by this invention is achieved through the following technical solution: A composite water supply pipe includes a transparent inner tube, and further includes a double-sided adhesive-coated felt, a fiberglass prepreg tape, and a polyolefin outer membrane laminated from the inside out on the transparent inner tube. The fiberglass prepreg tape has a thickness of 2.0-4.0 mm. The double-sided adhesive-coated felt includes a UV heat-insulating layer laminated to the outer wall of the transparent inner tube, a felt laminated to the UV heat-insulating layer, and a UV adhesive layer laminated to the surface of the felt laminate facing away from the UV heat-insulating layer. The felt is a high-silica glass fiber felt or polyester needle-punched felt with a thickness of 3.0-6.0 mm. The fiberglass prepreg tape includes UV prepreg and fiberglass fabric, and the prepreg accounts for 40.0-50.0 wt% of the total mass of the fiberglass prepreg tape.

[0006] This invention uses a UV-resistant heat-insulating adhesive layer and felt cloth composite to provide heat insulation for the CIPP repair of pipes, avoiding the expansion of internal stress caused by alternating hot and cold temperatures, thus improving the quality of CIPP repair of transparent inner pipes and extending the service life of the repaired water supply composite pipes.

[0007] Preferably, the UV heat-insulating adhesive layer contains 15-30 wt% hollow glass microspheres, and the thermal conductivity of the UV heat-insulating adhesive layer is 0.05-0.10 W / (m·K); the particle size of the hollow glass microspheres is ≤500 mesh.

[0008] The thickness of the UV heat insulation adhesive layer should not exceed 120μm. Therefore, the particle size of the hollow glass microspheres needs to be ≤500 mesh (25μm). On the one hand, excessively large surface particle size will affect the waterproof performance, and on the other hand, it will ensure its heat insulation performance.

[0009] Preferably, the UV prepreg and the UV adhesive layer in the glass fiber prepreg tape have the same formulation. Taking the UV prepreg as an example, it is made from the following raw materials in parts by weight: 10-25 parts polyurethane modified acrylate resin, 5-15 parts epoxy modified acrylate resin, 40-70 parts reactive diluent, 3-8 parts polyisocyanate crosslinking agent, 0.8-1.6 parts antioxidant, 0.05-0.20 parts defoamer, 0.25-0.50 parts wetting agent, 0.5-1.0 parts leveling agent, 1.0-2.5 parts photoinitiator, and 0.05-0.20 parts amino-modified upconversion nanoparticles; the hydroxyl content in the polyurethane modified acrylate resin is 50-100 mg KOH / g; the reactive diluent contains hydroxy methacrylate, and the hydroxy methacrylate accounts for 15-25 wt% of the total mass of the reactive diluent.

[0010] The reaction of the hydroxyl groups (-OH) in the side chains of polyurethane-modified acrylate resin and the -NCO groups in hydroxy methacrylate with the polyisocyanate crosslinking agents forms polyurethane bonds (-NH-CO-), increasing viscosity and yielding a gel-state UV prepreg tape containing a large number of unreacted active double bonds. After coating the transparent inner tube to be repaired, it undergoes UV curing followed by curing under laser irradiation with a wavelength of 980-1020nm. This allows for one-time curing, avoiding the UV aging risks associated with traditional multi-stage UV curing and improving the quality and service life of water supply composite pipes.

[0011] Preferably, the amino-modified upconversion nanoparticles are rare-earth-doped fluorides with amino-modified surfaces. The rare-earth-doped fluorides include a NaYF4 support and rare-earth ions doped into the NaYF4 support, wherein the rare-earth ions are Yb. 3+ Paired with Er 3+ Ho 3+ Tm 3+ At least one of them.

[0012] By adopting the above technical solution, the amino-modified upconversion nanoparticles uniformly distributed inside the resin will generate ultraviolet light under laser irradiation with a wavelength of 980-1020nm, which will allow the incompletely cured UV prepreg to continue to be cured by UV, thus achieving one-time curing and molding. This avoids the risk of ultraviolet aging that exists in traditional multiple UV curing molding, and improves the quality and service life of water supply composite pipes.

[0013] Preferably, the reactive diluent is a compound of at least one of the following: hydroxy methacrylate, diphenyl methacrylate-2-hydroxyethyl phosphate, N,N-dimethylacrylamide, N-acryloylmorpholine, isobornyl methacrylate, 3-isobornylcyclohexyl acrylate, ethoxyethoxyethyl acrylate, propoxylated neopentyl glycol diacrylate, neopentyl glycol polymethyl ethylene oxide diacrylate, and bis(trimethylolpropane)tetraacrylate.

[0014] By adopting the above technical solution, it is possible to ensure that a gel-state UV prepreg tape containing a large number of unreacted active double bonds is obtained through polyurethane reaction, and to ensure the physicochemical properties of the UV prepreg tape after curing. Finally, the cured product forms an IPN network interpenetrating structure, which improves the dimensional stability, impact resistance and weather resistance of the cured product.

[0015] Preferably, the preparation method of the glass fiber prepreg tape is as follows: Accurately metered polyurethane-modified acrylate resin, epoxy-modified acrylate resin, reactive diluent, polyisocyanate crosslinking agent, antioxidant, defoamer, wetting agent, leveling agent, and photoinitiator are placed in a vacuum reactor. Under normal pressure, the mixture is mechanically stirred at 300-600 rpm for 5-15 minutes, followed by vacuum degassing for 15-30 minutes. Nitrogen gas is then introduced to restore normal pressure, and the material is discharged to obtain UV prepreg. The UV prepreg is then coated onto release paper at a coating amount of 150-250 g / m². 2 After pre-curing at room temperature for 18-24 hours, a gel-state UV prepreg film is formed. The gel-state UV prepreg film is then hot-pressed onto the upper and lower surfaces of the fiberglass fabric, and then wound up and cut to obtain a UV prepreg tape.

[0016] By adopting the above technical solutions, mass production can be easily achieved, thereby reducing the production cost of fiberglass prepreg tape.

[0017] Preferably, the preparation method of the double-sided adhesive-coated felt is as follows: Step 1: Accurately measured polyurethane modified acrylate resin, epoxy modified acrylate resin, reactive diluent, polyisocyanate crosslinking agent, antioxidant, defoamer, wetting agent, leveling agent, and photoinitiator are placed in a vacuum reactor. Under normal pressure, the mixture is mechanically stirred at 300-600 rpm for 5-15 minutes, followed by vacuum degassing for 15-30 minutes. Nitrogen gas is then introduced to restore normal pressure, and the UV prepreg is discharged. Step 2: Take 70-85 parts by weight of UV prepreg and 15-30 parts by weight of hollow glass microspheres, and mechanically stir at 300-600 rpm for 5-15 minutes under normal pressure. Then, perform vacuum degassing treatment for 15-30 minutes, fill with nitrogen to restore normal pressure, and discharge the material to obtain UV heat insulation adhesive. Step 3: Apply the UV prepreg prepared in Step 1 onto the release paper, with a coating amount of 50-100 g / m². 2 After pre-curing at room temperature for 18-24 hours, it forms a gel-like UV adhesive tape. Simultaneously, the UV heat-insulating adhesive prepared in step one is coated onto the release paper, with a coating amount of 60-120 g / m². 2 After pre-curing at room temperature for 18-24 hours, it forms a gel-like UV heat-insulating tape. Step 4: Heat-press the gel-state UV adhesive tape onto the upper surface of the felt, and simultaneously heat-press the gel-state UV heat insulation tape onto the lower surface of the felt. Then, roll it up and cut it to obtain a double-sided coated felt.

[0018] By adopting the above technical solutions, mass production can be easily achieved, thereby reducing the production cost of fiberglass prepreg tape.

[0019] Preferably, the felt has a weight of 300±5 g / m². 2 Furthermore, it is made of high-silica glass fiber mat BMN300 with a thickness of 3.0mm and a basis weight of 500±5g / m. 2 Furthermore, it is a 5.0mm thick high-silica glass fiber mat BMN500 with a basis weight of 550±5g / m². 2 And any one of the following: polyester needle-punched felt with a thickness of 5.5mm.

[0020] By adopting the above technical solutions, the overall thermal insulation and cold resistance performance can be guaranteed, and the mechanical properties of the repaired water supply composite pipe can be improved.

[0021] The present invention provides a method for preparing a composite water supply pipe, which is achieved through the following scheme: A method for preparing a composite water supply pipe includes the following steps: Step 1: Prepare double-sided adhesive-coated felt and glass fiber prepreg tape respectively; Step 2: Wrap the double-sided adhesive-coated felt around the area to be repaired on the transparent inner tube, end to end, and then wrap the fiberglass prepreg tape around the outer wall of the double-sided adhesive-coated felt. Step 3: Curing under a UV light source for 60-100 seconds, with a unit light energy of 60-200 mW / cm² and a cumulative light energy of 5000-7000 mJ / cm². Finally, curing is carried out under a laser irradiation of 45-90 W with a wavelength of 980-1020 nm for 300-600 seconds to obtain the water supply composite pipe.

[0022] The above-mentioned method for preparing composite water supply pipes allows for CIPP repair of transparent inner pipes. The repaired composite water supply pipes exhibit better heat insulation and cold resistance, extending their overall service life.

[0023] Preferably, the number of turns of the fiberglass prepreg tape wound around the outer wall of the double-sided adhesive-coated felt is 5.5-8.5, and the total thickness of the fiberglass prepreg tape wound around the outer wall of the double-sided adhesive-coated felt is 2.0-4.0 mm.

[0024] By adopting the above technical solutions, the waterproof and safety performance of the transparent pipe after CIPP repair can be guaranteed.

[0025] In summary, the present invention has the following advantages: 1. This invention uses a UV-resistant heat-insulating adhesive layer and felt cloth composite to provide heat insulation treatment for the CIPP repair of the pipeline, avoiding the expansion of internal stress caused by alternating hot and cold temperatures, thus improving the quality of CIPP repair of the transparent inner tube and extending the service life of the repaired water supply composite pipe.

[0026] 2. The preparation methods of the glass fiber prepreg tape and double-sided coated felt in this invention are relatively simple and easy to achieve mass production, thereby reducing the production cost of glass fiber prepreg tape and double-sided coated felt. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the composite water supply pipe in this invention.

[0028] In the diagram, 1. Double-sided adhesive felt; 10. Transparent inner tube; 11. UV heat insulation adhesive layer; 12. Felt; 13. UV adhesive layer; 2. Fiberglass prepreg tape; 3. Polyolefin outer film. Detailed Implementation

[0029] To further understand the inventiveness and technical advancements of this invention, the preferred embodiments of this invention will be discussed in detail below with reference to examples and comparative examples.

[0030] Example: See Figure 1 A composite water supply pipe includes a transparent inner pipe 10 to be repaired, a double-sided adhesive-coated felt 1 laminated to the transparent inner pipe 10 from the inside out, a fiberglass prepreg tape 2, and a polyolefin outer membrane 3. The double-sided adhesive-coated felt 1 includes a UV heat-insulating layer 11 laminated to the outer wall of the transparent inner pipe 10, a felt 12 laminated to the UV heat-insulating layer 11, and a UV adhesive layer 13 laminated to the surface of the felt 12 facing away from the UV heat-insulating layer 11. The felt 12 is a high-silica fiberglass felt or polyester needle-punched felt with a thickness of 3.0-6.0 mm. Specifically, the felt 12 has a basis weight of 300±5 g / m². 2Furthermore, it is made of high-silica glass fiber mat BMN300 with a thickness of 3.0mm and a basis weight of 500±5g / m. 2 Furthermore, it is a 5.0mm thick high-silica glass fiber mat BMN500 with a basis weight of 550±5g / m². 2 And any one of the following: polyester needle-punched felt with a thickness of 5.5mm.

[0031] The thickness of the fiberglass prepreg tape 2 is 2.0-4.0 mm. The fiberglass prepreg tape 2 comprises UV prepreg and fiberglass fabric, with the prepreg accounting for 40.0-50.0 wt% of the total mass of the fiberglass prepreg tape 2. The fiberglass fabric has a thickness of 0.35-0.45 mm and a basis weight of 350-450 g / m. 2 The fiberglass woven fabric used can be specifically the SWR400 woven fabric from Nanjing Fiberglass Research and Design Institute Co., Ltd. Before use, the SWR400 woven fabric is immersed in a KH550 alcohol-water solution, heated to 60℃, and ultrasonically dispersed at 40kHz / 600W for 60 minutes. After draining, it is placed in a vacuum drying oven at 105℃ for 4 hours under a vacuum pressure of 0.1MPa to obtain aminosilane KH550 modified fiberglass woven fabric SWR400.

[0032] The UV prepreg and UV adhesive layer 13 in the glass fiber prepreg tape 2 have the same formulation. Taking the UV prepreg as an example, it is made from the following raw materials in parts by weight: 10-25 parts polyurethane modified acrylate resin, 5-15 parts epoxy modified acrylate resin, 40-70 parts reactive diluent, 3-8 parts polyisocyanate crosslinking agent, 0.8-1.6 parts antioxidant, 0.05-0.20 parts defoamer, 0.25-0.50 parts wetting agent, 0.5-1.0 parts leveling agent, 1.0-2.5 parts photoinitiator, and 0.05-0.20 parts amino-modified upconversion nanoparticles.

[0033] The hydroxyl content in the polyurethane-modified acrylate resin is 50-100 mg KOH / g. Specifically, the polyurethane-modified acrylate resin is at least one of the following: T-7000 difunctional polyurethane UV resin, T-7010N difunctional polyurethane UV resin, T-7222 difunctional dual-curing polyurethane acrylate UV resin, T-7135 difunctional polyurethane UV resin, T-7224 tetrafunctional dual-curing polyurethane acrylate UV resin, and T-7150 tetrafunctional polyurethane UV resin.

[0034] The epoxy-modified acrylate resin is at least one of epoxy acrylate 615T9XD11Q, epoxy-modified acrylate resin CR90426, and modified bisphenol A epoxy acrylate resin EBECRYL 3708.

[0035] The reactive diluent contains hydroxy methacrylate, which accounts for 15-25 wt% of the total mass of the reactive diluent. Specifically, the reactive diluent is a compound of at least one of the following: hydroxy methacrylate, diphenyl methacrylate-2-hydroxyethyl phosphate, N,N-dimethylacrylamide, N-acryloylmorpholine, isobornyl methacrylate, 3-isobornylcyclohexyl acrylate, ethoxyethoxyethyl acrylate, propoxylated neopentyl glycol diacrylate, neopentyl glycol polymethyl ethylene oxide diacrylate, and bis(trimethylolpropane)tetraacrylate.

[0036] The polyisocyanate crosslinking agent is at least one of 1,6-hexamethylene diisocyanate (HDI) and / or isoflurane diisocyanate (IPDI) combined with HDI dimer, HDI trimer, HDI biuret, and IPDI trimer.

[0037] The amino-modified upconversion nanoparticles are rare-earth-doped fluorides with amino-modified surfaces. The rare-earth-doped fluorides consist of a NaYF4 support and rare-earth ions doped into the NaYF4 support, with the rare-earth ions being Yb. 3+ Paired with Er 3+ Ho 3+ Tm 3+ At least one of the following. Specifically, the amino-modified upconversion nanoparticles are amino-modified upconversion nanoparticles with catalog number Q-0374460 provided by Xi'an Qiyue Biotechnology Co., Ltd.

[0038] Photoinitiators are composed of long-wavelength photoinitiators and short-wavelength photoinitiators.

[0039] The long-wavelength photoinitiator is at least one of photoinitiator TPO, photoinitiator 819, and photoinitiator 784. The short-wavelength photoinitiator is at least one of photoinitiator 184, photoinitiator 1173, photoinitiator 2959, and photoinitiator MBF.

[0040] The antioxidant can be selected as antioxidant 1010 and / or antioxidant 1098 combined with antioxidant 168.

[0041] The defoamer can be BYK-1790 and / or BYK-1794. The wetting agent can be BYK-UV 3530 and / or EBECREL-436. The leveling agent can be BYK-1788 and / or BYK-361N.

[0042] UV heat insulation adhesive is made from 70-85 parts by weight of UV prepreg and 15-30 parts by weight of hollow glass microspheres, with the particle size of the hollow glass microspheres being ≤500 mesh (25.0μm).

[0043] A composite water supply pipe and its manufacturing process, comprising the following steps: Step 1: Prepare double-sided adhesive-coated felt 1 and glass fiber prepreg tape 2 respectively; The preparation method of double-sided adhesive-coated felt 1 is as follows: S1.1, accurately measured polyurethane modified acrylate resin, epoxy modified acrylate resin, reactive diluent, polyisocyanate crosslinking agent, antioxidant, defoamer, wetting agent, leveling agent, and photoinitiator are placed in a vacuum reactor. Under normal pressure, the mixture is mechanically stirred at 300-600 rpm for 5-15 minutes, followed by vacuum degassing treatment for 15-30 minutes. Nitrogen gas is then introduced to restore normal pressure, and the product is discharged to obtain UV prepreg. S1.2 Take 70-85 parts by weight of UV prepreg and 15-30 parts by weight of hollow glass microspheres, and mechanically stir at 300-600 rpm for 5-15 minutes under normal pressure. Then, vacuum degassing is performed for 15-30 minutes. Nitrogen is introduced to restore normal pressure, and the material is discharged to obtain UV heat insulation adhesive. S1.3, The UV prepreg prepared in S1.1 is coated onto the release paper, with a coating amount of 50-100 g / m². 2 After pre-curing at room temperature for 18-24 hours, it forms a gel-like UV adhesive tape. Simultaneously, the UV heat-insulating adhesive prepared in S1.2 is coated onto the release paper, with a coating amount of 60-120 g / m². 2 After pre-curing at room temperature for 18-24 hours, it forms a gel-like UV heat-insulating tape. S1.4, heat-press the gel-state UV adhesive tape onto the upper surface of the felt 12, and at the same time heat-press the gel-state UV heat insulation tape onto the lower surface of the felt 12, then roll it up and cut it to obtain the double-sided coated felt 1. The preparation method of glass fiber prepreg tape 2 is as follows: The UV prepreg prepared in S1.1 is coated onto the release paper, with a coating amount of 150-250 g / m. 2 After pre-curing at room temperature for 18-24 hours, a gel-state UV prepreg film is formed. The gel-state UV prepreg film is hot-pressed onto the upper and lower surfaces of aminosilane KH550 modified glass fiber woven fabric SWR400, and then wound up and cut to obtain a UV prepreg tape. Step 2: Wrap the double-sided adhesive-coated felt 1 end to end around the area to be repaired on the transparent inner tube 10. Then, wrap the fiberglass prepreg tape 2 around the outer wall of the double-sided adhesive-coated felt 1. Specifically, the number of turns of the fiberglass prepreg tape 2 wrapped around the outer wall of the double-sided adhesive-coated felt 1 is 5.5-8.5, and the total thickness of the fiberglass prepreg tape 2 wrapped around the outer wall of the double-sided adhesive-coated felt 1 is 2.0-4.0 mm. Step 3: Curing under a UV light source for 60-100 seconds, with a unit light energy of 60-200 mW / cm² and a cumulative light energy of 5000-7000 mJ / cm². Finally, curing is carried out under a laser irradiation of 45-90 W with a wavelength of 980-1020 nm for 300-600 seconds to obtain the water supply composite pipe.

[0044] Example 1: The UV prepreg was made from the following raw materials in parts by weight: 15 parts T-7222 bifunctional dual-curing polyurethane acrylate UV resin, 5 parts T-7224 tetrafunctional dual-curing polyurethane acrylate UV resin, 4 parts epoxy acrylate 615T9XD11Q, 2 parts modified bisphenol A epoxy acrylate resin EBECRYL 3708, 15 parts hydroxyethyl methacrylate, 8 parts N,N-dimethylacrylamide, 25 parts isobornyl methacrylate, 10 parts bis(trimethylolpropane)tetraacrylate, 5 parts diphenyl methacrylate-2-hydroxyethyl phosphate, 5 parts 1,6-hexamethylene diisocyanate (HDI), 1.5 parts HDI trimer, 0.9 parts antioxidant 1010, 0.1 parts antioxidant 168, 0.10 parts defoamer BYK-1790, and 0.35 parts wetting agent BYK-UV. 3530, 0.65 parts leveling agent BYK-1788, 1.6 parts photoinitiator TPO, 0.8 parts photoinitiator 184, and 0.10 parts amino-modified upconversion nanoparticles with product number Q-0374460.

[0045] The UV heat insulation adhesive consists of 80 parts by weight of UV prepreg and 20 parts by weight of hollow glass microspheres. Preparation of hollow glass microspheres: Hollow glass microspheres HN60HS (provided by Shanxi Hainuo Technology Co., Ltd.) are sieved through a 500-mesh sieve, and the sieved material is hollow glass microspheres with a particle size ≤500 mesh (25.0μm).

[0046] A composite water supply pipe and its manufacturing process, comprising the following steps: Step 1: Prepare double-sided adhesive-coated felt 1 and glass fiber prepreg tape 2 respectively; The preparation method of double-sided adhesive-coated felt 1 is as follows: S1.1, accurately measured polyurethane modified acrylate resin, epoxy modified acrylate resin, reactive diluent, polyisocyanate crosslinking agent, antioxidant, defoamer, wetting agent, leveling agent, photoinitiator, and amino-modified upconversion nanoparticles are placed in a vacuum reactor. Under normal pressure, the mixture is mechanically stirred at 360 rpm for 8 minutes, then vacuumed and degassed for 30 minutes. Nitrogen gas is then introduced to restore normal pressure, and the UV prepreg is obtained by discharging the material. S1.2 Take 80 parts by weight of UV prepreg and 20 parts by weight of hollow glass microspheres with a particle size ≤500 mesh. Stir mechanically at 360 rpm for 8 minutes under normal pressure. Then, vacuum degassing treatment for 30 minutes, fill with nitrogen to restore normal pressure, and discharge the material to obtain UV heat insulation adhesive. S1.3, The UV prepreg prepared in S1.1 is coated onto the release paper at a coating amount of 60 g / m². 2 After pre-curing at room temperature for 24 hours, it forms a gel-like UV adhesive tape. Simultaneously, the UV heat-insulating adhesive prepared in S1.2 was coated onto the release paper, with a coating amount of 100 g / m². 2 After pre-curing at room temperature for 24 hours, it forms a gel-like UV heat-insulating tape. S1.4, heat-press the gel-state UV adhesive tape onto the felt 12 (felt 12 has a weight of 300g / m²). 2 The upper surface of the high silica glass fiber mat BMN300 (3.0mm thick, provided by Nanjing Glass Fiber Research and Design Institute Co., Ltd.) is coated with gel-state UV heat insulation tape and heat-pressed onto the lower surface of the mat 12. The mat 1 is then rolled up and cut to obtain double-sided coated mat 1. The preparation method of glass fiber prepreg tape 2 is as follows: The UV prepreg prepared in S1.1 is coated onto the release paper, with a coating amount of 170 g / m. 2 After pre-curing at room temperature for 24 hours, a gel-state UV prepreg film is formed. The gel-state UV prepreg film is hot-pressed onto the upper and lower surfaces of aminosilane KH550 modified glass fiber woven fabric SWR400, and then wound up and cut to obtain UV prepreg tape 2. Step 2: Drill a hole in the middle of a transparent PC tube with a length of 250mm, an outer diameter of Φ160mm, and a wall thickness of 4.0mm. The hole forms a through-hole with a diameter of 2mm, which serves as the repair position for the transparent inner tube. Wrap the double-sided adhesive-coated felt 1 prepared in S1.4 end to end around the repair position of the transparent inner tube 10. Then, wrap the glass fiber prepreg tape 2 around the outer wall of the double-sided adhesive-coated felt 1. Specifically, the glass fiber prepreg tape 2 wrapped around the outer wall of the double-sided adhesive-coated felt 1 has 6 turns and a thickness of 2.42mm. Step 3: Install ring-shaped LED lights on both sides of the transparent inner tube. First, cure with 254nm ultraviolet light for 40 seconds, with a unit light energy of 100mW / cm². Then, cure with 365nm ultraviolet light for 60 seconds, with a unit light energy of 60mW / cm². The cumulative light energy is 7600mJ / cm. Finally, cure under 60W laser irradiation with a wavelength of 980nm for 480 seconds to obtain the water supply composite pipe.

[0047] The UV heat insulation adhesive is cured with 254nm UV light for 30 seconds, with a unit light energy of 100mW / cm², and with 365nm UV light for 30 seconds, with a unit light energy of 60mW / cm², for a cumulative light energy of 4800mJ / cm². 2 This results in a cured product with a thermal conductivity of 0.074 W / (m·K) after the UV heat insulation adhesive has fully cured.

[0048] The difference between Example 2 and Example 1 is that the UV heat insulation adhesive consists of 85 parts by weight of UV prepreg and 75 parts by weight of hollow glass microspheres. The difference in preparation method is as follows: S1.2, 80 parts by weight of UV prepreg and 20 parts by weight of hollow glass microspheres with a particle size ≤500 mesh are taken and mechanically stirred at 360 rpm for 8 minutes under normal pressure. Then, vacuum degassing is performed for 30 minutes, followed by nitrogen filling to restore normal pressure. The UV heat insulation adhesive is then obtained by discharging the material. The remaining steps are the same.

[0049] The UV heat insulation adhesive is cured with 254nm UV light for 30 seconds, with a unit light energy of 100mW / cm², and with 365nm UV light for 30 seconds, with a unit light energy of 60mW / cm², for a cumulative light energy of 4800mJ / cm². 2 This results in a cured product with a thermal conductivity of 0.096 W / (m·K).

[0050] The difference between Example 3 and Example 1 is that the UV heat insulation adhesive consists of 70 parts by weight of UV prepreg and 30 parts by weight of hollow glass microspheres. The difference in preparation method is as follows: S1.2, 70 parts by weight of UV prepreg and 30 parts by weight of hollow glass microspheres with a particle size ≤500 mesh are taken and mechanically stirred at 360 rpm for 8 minutes under normal pressure. Then, vacuum is applied for degassing for 30 minutes, nitrogen is introduced to restore normal pressure, and the UV heat insulation adhesive is obtained. The remaining steps are the same.

[0051] The UV heat insulation adhesive is cured with 254nm UV light for 30 seconds, with a unit light energy of 100mW / cm², and with 365nm UV light for 30 seconds, with a unit light energy of 60mW / cm², for a cumulative light energy of 4800mJ / cm². 2 This results in a cured product with a thermal conductivity of 0.059 W / (m·K).

[0052] The difference between Comparative Example 1 and Example 1 is as follows: Step 1, the preparation method of glass fiber prepreg tape 2 is as follows: S1.1, accurately measured polyurethane modified acrylate resin, epoxy modified acrylate resin, reactive diluent, polyisocyanate crosslinking agent, antioxidant, defoamer, wetting agent, leveling agent, photoinitiator, and amino-modified upconversion nanoparticles are placed in a vacuum reactor, mechanically stirred at 360 rpm for 8 minutes under normal pressure, then vacuumed and vacuum degassing for 30 minutes, nitrogen is introduced to restore normal pressure, and the UV prepreg is obtained by discharging the material; S1.2, The UV prepreg prepared in S1.1 is coated onto the release paper at a coating amount of 60 g / m². 2 After pre-curing at room temperature for 24 hours, it forms a gel-like UV adhesive tape. S1.3, heat-press the gel-state UV adhesive tape onto the felt 12 (felt 12 has a weight of 300g / m²). 2 The high silica glass fiber mat BMN300 with a thickness of 3.0mm (provided by Nanjing Glass Fiber Research and Design Institute Co., Ltd.) is used to obtain glass fiber prepreg tape 2 by winding and cutting the upper and lower surfaces. Step 2: Drill a hole in the middle of a transparent PC tube with a length of 250mm, an outer diameter of Φ160mm, and a wall thickness of 4.0mm. The hole will form a through hole with a diameter of 2mm, which will be the repair position of the transparent inner tube. Wrap the fiberglass prepreg tape 2 around the outer wall of the double-sided adhesive felt 1. Specifically, the fiberglass prepreg tape 2 wrapped around the outer wall of the double-sided adhesive felt 1 will be wrapped 6 times, and the thickness of the fiberglass prepreg tape 2 wrapped around the outer wall of the double-sided adhesive felt 1 will be 2.42mm. Step 3: Install ring-shaped LED lights on both sides of the transparent inner tube. First, cure with 254nm ultraviolet light for 40 seconds, with a unit light energy of 100mW / cm². Then, cure with 365nm ultraviolet light for 60 seconds, with a unit light energy of 60mW / cm². The cumulative light energy is 7600mJ / cm. Finally, cure under 60W laser irradiation with a wavelength of 980nm for 480 seconds to obtain the water supply composite pipe.

[0053] The difference between Comparative Example 2 and Example 1 is that the UV heat insulation adhesive is replaced with UV adhesive tape. The difference in preparation method is that in step S1.4, the gel-state UV adhesive tape is heat-pressed onto the upper and lower surfaces of the felt 12, and then rolled up and cut to obtain the double-sided adhesive felt 1; the remaining steps are the same.

[0054] UV adhesive tape is cured with 254nm UV light for 30 seconds, with a unit light energy of 100mW / cm², and with 365nm UV light for 30 seconds, with a unit light energy of 60mW / cm², for a cumulative light energy of 4800mJ / cm². 2This results in a cured product with a thermal conductivity of 0.208 W / (m·K) after the UV adhesive tape has fully cured.

[0055] The difference between Comparative Example 3 and Example 1 is that the UV heat insulation adhesive consists of 92 parts by weight of UV prepreg and 8 parts by weight of hollow glass microspheres. The difference in preparation method is as follows: S1.2, 92 parts by weight of UV prepreg and 8 parts by weight of hollow glass microspheres with a particle size ≤500 mesh are taken and mechanically stirred at 360 rpm for 8 minutes under normal pressure. Then, vacuum degassing is performed for 30 minutes, followed by nitrogen filling to restore normal pressure. The UV heat insulation adhesive is then obtained by discharging the material. The remaining steps are the same.

[0056] The UV heat insulation adhesive is cured with 254nm UV light for 30 seconds, with a unit light energy of 100mW / cm², and with 365nm UV light for 30 seconds, with a unit light energy of 60mW / cm², for a cumulative light energy of 4800mJ / cm². 2 This results in a cured product with a thermal conductivity of 0.147 W / (m·K).

[0057] The difference between Comparative Example 4 and Example 1 is that the UV prepreg was made from the following raw materials in parts by weight: 15 parts T-7222 difunctional dual-curing polyurethane acrylate UV resin, 5 parts T-7224 tetrafunctional dual-curing polyurethane acrylate UV resin, 4 parts epoxy acrylate 615T9XD11Q, 2 parts modified bisphenol A epoxy acrylate resin EBECRYL 3708, 15 parts hydroxyethyl methacrylate, 8 parts N,N-dimethylacrylamide, 25 parts isobornyl methacrylate, 10 parts bis(trimethylolpropane)tetraacrylate, 5 parts diphenyl methacrylate-2-hydroxyethyl phosphate, 5 parts 1,6-hexamethylene diisocyanate (HDI), 1.5 parts HDI trimer, 0.9 parts antioxidant 1010, 0.1 parts antioxidant 168, 0.10 parts defoamer BYK-1790, and 0.35 parts wetting agent BYK-UV. 3530, 0.65 parts leveling agent BYK-1788, 1.6 parts photoinitiator TPO.

[0058] The difference in preparation method is as follows: S1.1, accurately measured polyurethane modified acrylate resin, epoxy modified acrylate resin, reactive diluent, polyisocyanate crosslinking agent, antioxidant, defoamer, wetting agent, leveling agent, and photoinitiator are placed in a vacuum reactor and mechanically stirred at 360 rpm for 8 minutes under normal pressure. Then, a vacuum is drawn and vacuum degassing is performed for 30 minutes. Nitrogen gas is then introduced to restore normal pressure, and the UV prepreg is obtained by discharging. The remaining steps are the same.

[0059] The UV heat insulation adhesive is cured with 254nm UV light for 30 seconds, with a unit light energy of 100mW / cm², and with 365nm UV light for 30 seconds, with a unit light energy of 60mW / cm², for a cumulative light energy of 4800mJ / cm². 2 This results in a cured product with a thermal conductivity of 0.073 W / (m·K) after the UV heat insulation adhesive has fully cured.

[0060] Performance Test A: Aging Resistance Test of Impregnated Fiberglass Pipes: The pipes were placed in an aging test chamber for simulated aging, aged at 85℃ / 80RH% for 1000 hours. Afterwards, they were placed in the aging test chamber for thermal cycling tests: low temperature -40℃, maintenance time 30 minutes; high temperature 85℃, maintenance time 30 minutes, temperature transition time 5 minutes. These cycles were repeated 100, 200, 300, 400, and 500 times respectively. Following this, a pressure test was performed, running at 1.5MPa water pressure for 24 hours. The repaired areas were observed for any leakage. If leakage occurred, the pipes were recorded as unqualified; otherwise, they were recorded as qualified.

[0061] Table 1: Test parameters for thermal cycling resistance of water supply composite pipes in Examples 1-3 and Comparative Examples 1-4 Performance Test B: Aging Resistance Test of Impregnated Fiberglass Pipes: Simulated aging tests were conducted in an aging test chamber at 85℃ / 80RH% for 500h, 1000h, 1500h, and 2000h respectively. Afterwards, the pipes were removed and placed in the aging test chamber for thermal cycling tests: low temperature -40℃, maintenance time 30min; high temperature 85℃, maintenance time 30min, temperature transition time 5min, for 300 cycles. Following this, a pressure test was performed at 1.5MPa water pressure for 24h. The repaired areas were observed for any leakage. If leakage occurred, the pipes were recorded as unqualified; otherwise, they were recorded as qualified.

[0062] Table 2: Aging resistance ring test parameters of water supply composite pipes in Examples 1-3 and Comparative Examples 1-4 As can be seen from Examples 1-3 and Comparative Example 1, and Tables 1-2, the present invention uses a UV-resistant heat-insulating adhesive layer + felt cloth composite to perform heat insulation treatment on the CIPP repair of the pipeline, avoiding the expansion of internal stress caused by alternating hot and cold temperatures, thus improving the quality of CIPP repair of the transparent inner tube and extending the service life of the repaired water supply composite pipe.

[0063] Based on Examples 1-3 and Comparative Examples 2-3, and in conjunction with Table 1-2, it can be seen that the content of hollow glass microspheres in the UV heat insulation adhesive layer should be controlled at 15-30 wt%, with a preferred range of 20-25 wt%, to ensure the quality of CIPP repair of the transparent inner tube and extend the life of the repaired water supply composite pipe.

[0064] Based on Examples 1-3 and Comparative Example 4, and in conjunction with Tables 1-2, it can be seen that the addition of amino-modified upconversion nanoparticles allows double-sided coated felt and glass fiber prepreg tape to be cured and molded in only one step, avoiding the risk of ultraviolet aging associated with traditional multiple UV curing molding, and improving the quality and service life of water supply composite pipes.

[0065] It should be noted that this specific embodiment is merely an explanation of the technical solution of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A composite water supply pipe, comprising a transparent inner pipe (10), characterized in that: It also includes a double-sided coated felt (1), a glass fiber prepreg tape (2), and a polyolefin outer film (3) that are laminated from the inside out to the transparent inner tube (10). The glass fiber prepreg tape (2) has a thickness of 2.0-4.0 mm. The double-sided coated felt (1) includes a UV heat insulation layer (11) laminated to the outer wall of the transparent inner tube (10), a felt (12) laminated to the UV heat insulation layer (11), and a UV adhesive layer (13) laminated to the surface of the felt (12) facing away from the UV heat insulation layer (11). The felt (12) is a high silica glass fiber felt or polyester needle-punched felt with a thickness of 3.0-6.0 mm. The glass fiber prepreg tape (2) includes a UV prepreg and a glass fiber fabric. The prepreg accounts for 40.0-50.0 wt% of the total mass of the glass fiber prepreg tape (2).

2. The water supply composite pipe according to claim 1, characterized in that: The UV heat insulation adhesive layer (11) contains 15-30wt% hollow glass microspheres, and the thermal conductivity of the UV heat insulation adhesive layer (11) is 0.05-0.10W / (m·K); the particle size of the hollow glass microspheres is ≤500 mesh.

3. The water supply composite pipe according to claim 2, characterized in that: The UV prepreg in the glass fiber prepreg tape (2) and the UV adhesive layer (13) have the same formulation. Taking the UV prepreg as an example, it is made from the following raw materials in parts by weight: 10-25 parts polyurethane modified acrylate resin, 5-15 parts epoxy modified acrylate resin, 40-70 parts reactive diluent, 3-8 parts polyisocyanate crosslinking agent, 0.8-1.6 parts antioxidant, 0.05-0.20 parts defoamer, 0.25-0.50 parts wetting agent, 0.5-1.0 parts leveling agent, 1.0-2.5 parts photoinitiator, and 0.05-0.20 parts amino-modified upconversion nanoparticles; the hydroxyl content in the polyurethane modified acrylate resin is 50-100 mg KOH / g; the reactive diluent contains hydroxy methacrylate, and the hydroxy methacrylate accounts for 15-25 wt% of the total mass of the reactive diluent.

4. A composite water supply pipe according to claim 3, characterized in that: The amino-modified upconversion nanoparticles are rare-earth-doped fluorides with amino-modified surfaces. The rare-earth-doped fluorides include a NaYF4 support and rare-earth ions doped into the NaYF4 support, wherein the rare-earth ions are Yb. 3+ Paired with Er 3+ Ho 3+ Tm 3+ At least one of them.

5. A composite water supply pipe according to claim 3, characterized in that: The active diluent is a compound of at least one of the following: hydroxy methacrylate, diphenyl methacrylate-2-hydroxyethyl phosphate, N,N-dimethylacrylamide, N-acryloylmorpholine, isobornyl methacrylate, 3-isobornylcyclohexyl acrylate, ethoxyethoxyethyl acrylate, propoxylated neopentyl glycol diacrylate, neopentyl glycol polymethyl ethylene oxide diacrylate, and bis(trimethylolpropane)tetraacrylate.

6. A composite water supply pipe according to claim 3, characterized in that: The preparation method of the glass fiber prepreg tape (2) is as follows: Accurately metered polyurethane modified acrylate resin, epoxy modified acrylate resin, reactive diluent, polyisocyanate crosslinking agent, antioxidant, defoamer, wetting agent, leveling agent, and photoinitiator are placed in a vacuum reactor. Under normal pressure, the mixture is mechanically stirred at 300-600 rpm for 5-15 minutes, followed by vacuum degassing for 15-30 minutes. Nitrogen gas is then introduced to restore normal pressure, and the material is discharged to obtain UV prepreg. The UV prepreg is then coated onto release paper with a coating amount of 150-250 g / m². 2 After pre-curing at room temperature for 18-24 hours, a gel-state UV prepreg film is formed. The gel-state UV prepreg film is then hot-pressed onto the upper and lower surfaces of the fiberglass fabric, and then wound up and cut to obtain a UV prepreg tape.

7. A composite water supply pipe according to claim 3, characterized in that: The preparation method of the double-sided adhesive-coated felt (1) is as follows: Step 1: Accurately measured polyurethane modified acrylate resin, epoxy modified acrylate resin, reactive diluent, polyisocyanate crosslinking agent, antioxidant, defoamer, wetting agent, leveling agent, and photoinitiator are placed in a vacuum reactor. Under normal pressure, the mixture is mechanically stirred at 300-600 rpm for 5-15 minutes, followed by vacuum degassing for 15-30 minutes. Nitrogen gas is then introduced to restore normal pressure, and the UV prepreg is discharged. Step 2: Take 70-85 parts by weight of UV prepreg and 15-30 parts by weight of hollow glass microspheres, and mechanically stir at 300-600 rpm for 5-15 minutes under normal pressure. Then, perform vacuum degassing treatment for 15-30 minutes, fill with nitrogen to restore normal pressure, and discharge the material to obtain UV heat insulation adhesive. Step 3: Apply the UV prepreg prepared in Step 1 onto the release paper, with a coating amount of 50-100 g / m². 2 After pre-curing at room temperature for 18-24 hours, it forms a gel-like UV adhesive tape. Simultaneously, the UV heat-insulating adhesive prepared in step one is coated onto the release paper, with a coating amount of 60-120 g / m². 2 After pre-curing at room temperature for 18-24 hours, it forms a gel-like UV heat-insulating tape. Step 4: Heat-press the gel-state UV adhesive tape onto the upper surface of the felt (12), and at the same time heat-press the gel-state UV heat insulation tape onto the lower surface of the felt (12), then roll it up and cut it to obtain the double-sided coated felt (1).

8. A composite water supply pipe according to claim 7, characterized in that: The felt (12) has a weight of 300±5g / m². 2 Furthermore, it is made of high-silica glass fiber mat BMN300 with a thickness of 3.0mm and a basis weight of 500±5g / m. 2 Furthermore, it is a 5.0mm thick high-silica glass fiber mat BMN500 with a basis weight of 550±5g / m². 2 And any one of the following: polyester needle-punched felt with a thickness of 5.5mm.

9. A method for preparing a water supply composite pipe according to any one of claims 1-8, characterized in that: Includes the following steps: Step 1: Prepare double-sided coated felt (1) and glass fiber prepreg tape (2) respectively. Step 2: Wrap the double-sided adhesive felt (1) end to end around the part of the transparent inner tube (10) to be repaired, and then wrap the glass fiber prepreg tape (2) around the outer wall of the double-sided adhesive felt (1). Step 3: Curing under a UV light source for 60-100 seconds, with a unit light energy of 60-200 mW / cm² and a cumulative light energy of 5000-7000 mJ / cm². Finally, curing is carried out under a laser irradiation of 45-90 W with a wavelength of 980-1020 nm for 300-600 seconds to obtain the water supply composite pipe.

10. The method for preparing a composite water supply pipe according to claim 9, characterized in that: The number of turns of the fiberglass prepreg tape (2) wrapped around the outer wall of the double-sided adhesive felt (1) is 5.5-8.5, and the total thickness of the fiberglass prepreg tape (2) wrapped around the outer wall of the double-sided adhesive felt (1) is 2.0-4.0 mm.

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