Material for non-excavation repair of pipeline and repair construction process

Abstract

The invention relates to a pipeline trenchless repair material and a repair construction process, and belongs to the technical field of pipeline trenchless repair, the raw materials comprise the following components by weight: functionalized epoxy acrylate resin, an initiator, silicon dioxide aluminum-doped composite microspheres, a dispersant and an antifoaming agent. The invention further discloses a trenchless construction process which comprises the following steps: Q1, preparing the lining pipe from the glass fiber cloth, the inner film, the outer film, the ultraviolet protective film and the pipeline trenchless repair material; q2, the inner wall of the damaged pipeline is cleaned and dried, then the lining pipe is dragged into the damaged pipeline, trimming, sealing and inflating are conducted according to the shape of the damaged position of the damaged pipeline, and the inner wall of the damaged pipeline is attached; q3, ultraviolet automatic control equipment is adopted for irradiating the inflated lining pipe so that the lining pipe can be polymerized and cured; and Q4, after polymerization and curing of the lining pipe in the step Q3 are completed, good detection is carried out. The material has the advantages of high strength, good toughness and high material stability.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline trenchless repair, and in particular relates to a pipeline trenchless repair material and a repair construction process. Background Art

[0002] In the process of urbanization, the construction of municipal drainage systems requires the laying of a large number of pipes. Pipeline wall corrosion is prone to occur during use, which leads to leakage. More serious pipeline damage or deformation damage will bring more serious consequences. Therefore, pipeline repair is very important.

[0003] As for pipeline repair technology, trenchless repair technology is one of them. Among the existing trenchless repair technologies, the commonly used epoxy acrylate resin has a fast light curing speed and good corrosion resistance, but it is difficult to fully infiltrate the fiberglass cloth, resulting in difficulty in forming an effective support system after the material is cured. The bending strength of the material is low, which affects the service life of the pipeline. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a pipeline trenchless repair material and a repair construction process.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A material for trenchless repair of pipelines, wherein the raw materials thereof include the following components in parts by weight: 85-95 parts of functionalized epoxy acrylate resin, 4-6 parts of initiator, 3-5 parts of silicon dioxide-doped aluminum composite microspheres, 0.5-1 parts of dispersant and 0.3-0.7 parts of defoamer.

[0009] The preparation of the silicon dioxide-doped aluminum composite microspheres comprises the following steps:

[0010] A1. According to weight, weigh 0.4-0.6 parts of a mixture of potassium aluminum sulfate dodecahydrate and aqueous ammonia, add 1-2 parts of water, and stir for 0.5-1h to obtain a mixed solution A;

[0011] A2. According to weight, weigh 1 part of sodium silicate and dissolve it in 10-15 parts of water, add it to 15-20 parts of 20-30% n-butanol solution, stir evenly, then add 0.06-0.1 parts of vinyltrimethoxysilane, stir for 20-40 minutes, and obtain mixed solution B;

[0012] A3, according to weight parts, add 50-70% sulfuric acid solution to the mixed solution B prepared in step A2, adjust the pH to 5-6, let stand for 20-40 minutes, adjust the pH to 4-5, heat to 60-80°C, stir for 1-2 hours, and cool to obtain a silica modified solution;

[0013] A4. Add the mixed solution A prepared in step A1 to the silica-modified solution prepared in step A3, stir evenly, heat to 55-65°C, react for 2-3 hours to obtain a precipitate, filter, dry, then put into a muffle furnace at 400-500°C, heat for 1.5-2.5 hours, crush, and pass through a 200-mesh sieve to obtain silica-doped aluminum composite microspheres.

[0014] Furthermore, the molar ratio of the potassium aluminum sulfate dodecahydrate to the ammonia water is 1:2.

[0015] Furthermore, the preparation of the functionalized epoxy acrylate resin comprises the following steps:

[0016] S1. According to parts by weight, 30 to 40 parts of propylene glycol and 8 to 12 parts of maleic anhydride are uniformly mixed, 0.5 to 0.7 parts of 2-tert-butylhydroquinone are added, and the mixture is heated to 70 to 80° C., stirred for reaction for 40 to 80 minutes, and cooled to room temperature to obtain a mixture A;

[0017] S2, according to parts by weight, to the mixture A prepared in step S1, add 0.4-0.6 parts of triethylamine, stir evenly, then heat to 60-70° C., add 50-60 parts of epoxy resin, stir and react for 0.5-1h to obtain a mixture B;

[0018] S3. Add 2 to 3 parts of hydroxyethyl acrylate to the mixture B prepared in step S2 according to parts by weight, stir evenly, heat to 80 to 90° C., and stir to react for 60 to 80 minutes to obtain a functionalized epoxy acrylate resin.

[0019] Furthermore, the powder is any one of fatty alcohol polyoxyethylene ether and monolauryl phosphate, or a mixture of the two.

[0020] Furthermore, the deca-initiator is at least one of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, benzophenone and α-hydroxyisopropyl benzophenone.

[0021] Furthermore, the defoaming agent is any one of dimethyl polysiloxane and polyether siloxane or a mixture of the two.

[0022] Furthermore, the components of the raw materials are evenly mixed to obtain the material for trenchless repair of pipelines.

[0023] A repair construction process of a pipeline trenchless repair material comprises the following steps:

[0024] Q1. The glass fiber cloth is made into a hose together with an inner membrane, an outer membrane and an ultraviolet light protection film. Under vacuum conditions, the hose is infiltrated with a material for trenchless pipeline repair. After the infiltration is completed, an inner liner for pipeline repair is obtained;

[0025] Q2. Clean the inner wall surface of the damaged pipe, remove water and dry it, then drag the liner tube prepared in step Q1 into the damaged pipe, trim the liner tube according to the shape of the damaged part of the damaged pipe, and then put it into an ultraviolet lamp, seal both ends of the trimmed liner tube, and inflate the trimmed liner tube so that the inflated liner tube fits the inner wall of the damaged pipe;

[0026] Q3. Use ultraviolet automated control equipment to irradiate the inflated liner tube, and initiate polymerization and curing of the repair material through light;

[0027] Q4. After the polymerization and curing of the liner pipe in step Q3 is completed, use pipeline inspection equipment to check the condition of the repaired pipeline and clean the inside of the pipeline to complete the repair.

[0028] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0029] 1. The present invention modifies silica so that the silica particles have good compatibility in the resin system, improves the uniformity and dispersion state of the silica particles themselves, and then loads the modified silica on the aluminum shell structure. The narrow pores of the shell layer have a confinement effect, which can inhibit the formation of long molecular chain products when the modified silica and the resin molecular chain are cross-linked, thereby achieving an anti-aggregation effect.

[0030] 2. The present invention functionalizes the epoxy acrylate resin so that the silica-doped aluminum composite microspheres and the epoxy acrylate resin maintain a uniform cross-linking state during the photocuring cross-linking polymerization, and the local viscosity will not surge due to the polymerization of too many segments, thereby ensuring the uniformity of the curing of the resin system. In addition, the silica particles have unsaturated double bond groups on the surface, which can increase the steric effect between the particles. The silica particles fill the spatial position in the functionalized epoxy acrylate resin segment, so that it can form a stable support system with the silica-doped aluminum composite microspheres as nodes, thereby achieving an enhanced effect.

[0031] Functionalized epoxy acrylate resin cooperates with silica-doped aluminum composite microspheres to achieve better fluidity and wetting effect of the resin system, so that the acrylate resin can effectively wrap the glass fiber cloth, improve the integrity of the material, and show good mechanical properties.

[0032] 3. The trenchless pipeline repair material prepared by the present invention is used to repair damaged pipelines, thereby extending the service life of the pipelines. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Commercially available epoxy acrylate resin was purchased from Guangzhou Qisheng Trading Co., Ltd.

[0035] Example 1

[0036] According to weight parts, 90 parts of functionalized epoxy acrylate resin, 5 parts of initiator, 4 parts of silica-doped aluminum composite microspheres, 0.5 parts of dispersant and 0.5 parts of defoamer are uniformly mixed to obtain a material for trenchless repair of pipelines.

[0037] The preparation of functionalized epoxy acrylate resin comprises the following steps:

[0038] S1. According to parts by weight, 35 parts of propylene glycol and 10 parts of maleic anhydride were uniformly mixed, 0.6 parts of 2-tert-butylhydroquinone were added, and the mixture was heated to 75° C., stirred for reaction for 60 minutes, and cooled to room temperature to obtain a mixture A;

[0039] S2. According to parts by weight, 0.5 parts of triethylamine were added to the mixture A prepared in step S1, and the mixture was stirred evenly. After heating to 65° C., 55 parts of epoxy resin were added, and the mixture was stirred and reacted for 1 hour to obtain a mixture B.

[0040] S3. Add 2 parts of hydroxyethyl acrylate to the mixture B prepared in step S2 in parts by weight, stir evenly, heat to 85° C., and stir for 70 minutes to obtain a functionalized epoxy acrylate resin.

[0041] The preparation of the silicon dioxide-doped aluminum composite microspheres comprises the following steps:

[0042] A1. According to parts by weight, weigh 0.5 parts of a mixture of potassium aluminum sulfate dodecahydrate and aqueous ammonia, add it to 1 part of water, and stir for 0.5 hours to obtain a mixed solution A;

[0043] A2. According to weight, weigh 1 part of sodium silicate and dissolve it in 10 parts of water, add it to 15 parts of 25% n-butanol solution, stir evenly, add 0.06 parts of vinyltrimethoxysilane, stir for 30 minutes, and obtain mixed solution B;

[0044] A3. Add 60% sulfuric acid solution by weight to the mixed solution B prepared in step A2, adjust the pH to 5, let stand for 30 minutes, adjust the pH to 4, heat to 70°C, stir for 1 hour, and cool to obtain a silica-modified solution;

[0045] A4. Add the mixed solution A prepared in step A1 to the silica-modified solution prepared in step A3, stir evenly, heat to 60°C, react for 2 hours to obtain a precipitate, filter, dry, and then put it into a muffle furnace at 450°C, heat for 2.0 hours, crush, and pass through a 200-mesh sieve to obtain silica-doped aluminum composite microspheres.

[0046] The molar ratio of the potassium aluminum sulfate dodecahydrate to the ammonia water is 1:2.

[0047] The dispersant is fatty alcohol polyoxyethylene ether.

[0048] The initiator is (2,4,6-trimethylbenzoyl)diphenylphosphine oxide.

[0049] The defoaming agent is dimethyl polysiloxane.

[0050] A preparation process of a pipeline trenchless repair material comprises the following steps: uniformly mixing various components of raw materials to obtain the pipeline trenchless repair material.

[0051] A repair construction process of a pipeline trenchless repair material comprises the following steps:

[0052] Q1. The glass fiber cloth, the inner film, the outer film, and the ultraviolet light protection film are made into a hose. Under vacuum conditions, the hose is infiltrated with the trenchless pipeline repair material prepared in this embodiment. After the infiltration is completed, an inner liner for pipeline repair is obtained;

[0053] Q2. Clean the inner wall surface of the damaged pipe, remove water and dry it, then drag the liner tube prepared in step Q1 into the damaged pipe, trim the liner tube according to the shape of the damaged part of the damaged pipe, and then put it into an ultraviolet lamp, seal both ends of the trimmed liner tube, and inflate the trimmed liner tube so that the inflated liner tube fits the inner wall of the damaged pipe;

[0054] Q3. Use ultraviolet automated control equipment to irradiate the inflated liner tube, and initiate polymerization and curing of the repair material through light;

[0055] Q4. After the polymerization and curing of the liner pipe in step Q3 is completed, use pipeline inspection equipment to check the condition of the repaired pipeline and clean the inside of the pipeline to complete the repair.

[0056] Example 2

[0057] According to weight parts, 85 parts of functionalized epoxy acrylate resin, 4 parts of initiator, 3 parts of silica-doped aluminum composite microspheres, 0.5 parts of dispersant and 0.3 parts of defoamer are uniformly mixed to obtain a material for trenchless repair of pipelines.

[0058] The preparation of functionalized epoxy acrylate resin comprises the following steps:

[0059] S1. According to parts by weight, 30 parts of propylene glycol and 8 parts of maleic anhydride were mixed evenly, 0.5 parts of 2-tert-butylhydroquinone were added, and the mixture was heated to 70° C., stirred for reaction for 40 minutes, and cooled to room temperature to obtain a mixture A;

[0060] S2. According to parts by weight, 0.4 parts of triethylamine were added to the mixture A prepared in step S1, and the mixture was stirred evenly. After heating to 60° C., 50 parts of epoxy resin were added, and the mixture was stirred and reacted for 0.5 h to obtain a mixture B.

[0061] S3. Add 2 parts of hydroxyethyl acrylate to the mixture B prepared in step S2 according to parts by weight, stir evenly, heat to 80° C. and stir for 60 minutes to obtain a functionalized epoxy acrylate resin.

[0062] The preparation of the silicon dioxide-doped aluminum composite microspheres comprises the following steps:

[0063] A1. According to parts by weight, weigh 0.4 parts of a mixture of potassium aluminum sulfate dodecahydrate and aqueous ammonia, add it to 1 part of water, and stir for 0.5 hours to obtain a mixed solution A;

[0064] A2. According to weight, weigh 1 part of sodium silicate and dissolve it in 10 parts of water, add it to 15 parts of 20% n-butanol solution, stir evenly, add 0.06 parts of vinyltrimethoxysilane, stir for 20 minutes, and obtain mixed solution B;

[0065] A3. Add 50% sulfuric acid solution by weight to the mixed solution B prepared in step A2, adjust the pH to 5, let stand for 20 minutes, adjust the pH to 4, heat to 60°C, stir for 1 hour, and cool to obtain a silica-modified solution;

[0066] A4. Add the mixed solution A prepared in step A1 to the silica-modified solution prepared in step A3, stir evenly, heat to 55°C, react for 2 hours to obtain a precipitate, filter, dry, and then put it into a muffle furnace at 400°C, heat for 1.5 hours, crush, and pass through a 200-mesh sieve to obtain silica-doped aluminum composite microspheres.

[0067] The molar ratio of the potassium aluminum sulfate dodecahydrate to the ammonia water is 1:2.

[0068] The dispersant is monolauryl phosphate.

[0069] The initiator is benzophenone.

[0070] The defoamer is polyether siloxane.

[0071] A repair construction process of a pipeline trenchless repair material is the same as that of Example 1.

[0072] Example 3

[0073] According to weight parts, 95 parts of functionalized epoxy acrylate resin, 6 parts of initiator, 5 parts of silica-doped aluminum composite microspheres, 1 part of dispersant and 0.7 parts of defoamer are uniformly mixed to obtain a material for trenchless repair of pipelines.

[0074] The preparation of functionalized epoxy acrylate resin comprises the following steps:

[0075] S1. According to parts by weight, 40 parts of propylene glycol and 12 parts of maleic anhydride were mixed evenly, 0.7 parts of 2-tert-butylhydroquinone were added, and the mixture was heated to 80° C., stirred for reaction for 80 minutes, and cooled to room temperature to obtain a mixture A;

[0076] S2. According to parts by weight, 0.6 parts of triethylamine were added to the mixture A prepared in step S1, and the mixture was stirred evenly. After heating to 70° C., 60 parts of epoxy resin were added, and the mixture was stirred for reaction for 1 hour to obtain a mixture B.

[0077] S3. Add 3 parts by weight of hydroxyethyl acrylate to the mixture B prepared in step S2, stir evenly, heat to 90° C., and stir for 80 minutes to obtain a functionalized epoxy acrylate resin.

[0078] The preparation of the silicon dioxide-doped aluminum composite microspheres comprises the following steps:

[0079] A1. According to parts by weight, weigh 0.6 parts of a mixture of potassium aluminum sulfate dodecahydrate and aqueous ammonia, add it to 2 parts of water, and stir for 1 hour to obtain a mixed solution A;

[0080] A2. According to weight, weigh 1 part of sodium silicate and dissolve it in 15 parts of water, add it to 20 parts of 30% n-butanol solution, stir evenly, then add 0.1 parts of vinyltrimethoxysilane, stir for 40 minutes, and obtain mixed solution B;

[0081] A3. Add 70% sulfuric acid solution by weight to the mixed solution B prepared in step A2, adjust the pH to 6, let stand for 40 minutes, adjust the pH to 5, heat to 80°C, stir for 2 hours, and cool to obtain a silica-modified solution;

[0082] A4. Add the mixed solution A prepared in step A1 to the silica-modified solution prepared in step A3, stir evenly, heat to 65°C, react for 3 hours to obtain a precipitate, filter, dry, then put into a muffle furnace at 500°C, heat for 2.5 hours, crush, and pass through a 200-mesh sieve to obtain silica-doped aluminum composite microspheres.

[0083] The molar ratio of the potassium aluminum sulfate dodecahydrate to the ammonia water is 1:2.

[0084] The dispersant is fatty alcohol polyoxyethylene ether.

[0085] The initiator is α-hydroxyisopropyl benzophenone.

[0086] The defoaming agent is dimethyl polysiloxane.

[0087] A repair construction process of a pipeline trenchless repair material is the same as that of Example 1.

[0088] Example 4

[0089] According to weight parts, 88 parts of functionalized epoxy acrylate resin, 4.5 parts of initiator, 3.5 parts of silica-doped aluminum composite microspheres, 0.6 parts of dispersant and 0.4 parts of defoamer are uniformly mixed to obtain a material for trenchless repair of pipelines.

[0090] The preparation of functionalized epoxy acrylate resin comprises the following steps:

[0091] S1. According to parts by weight, 33 parts of propylene glycol and 9 parts of maleic anhydride were uniformly mixed, 0.55 parts of 2-tert-butylhydroquinone were added, and the mixture was heated to 74° C., stirred for reaction for 50 minutes, and cooled to room temperature to obtain a mixture A;

[0092] S2. According to parts by weight, 0.45 parts of triethylamine were added to the mixture A prepared in step S1, and the mixture was stirred evenly. After heating to 63° C., 52 parts of epoxy resin were added, and the mixture was stirred and reacted for 0.6 h to obtain a mixture B.

[0093] S3. Add 2.3 parts of hydroxyethyl acrylate to the mixture B prepared in step S2 according to parts by weight, stir evenly, heat to 83° C. and stir for 65 minutes to obtain a functionalized epoxy acrylate resin.

[0094] The preparation of the silicon dioxide-doped aluminum composite microspheres comprises the following steps:

[0095] A1. According to parts by weight, weigh 0.45 parts of a mixture of potassium aluminum sulfate dodecahydrate and aqueous ammonia, add it to 1.2 parts of water, and stir for 0.6 hours to obtain a mixed solution A;

[0096] A2. According to weight, weigh 1 part of sodium silicate and dissolve it in 12 parts of water, add it to 16 parts of 23% n-butanol solution, stir evenly, add 0.07 parts of vinyltrimethoxysilane, stir for 25 minutes, and obtain mixed solution B;

[0097] A3. Add 55% sulfuric acid solution by weight to the mixed solution B prepared in step A2, adjust the pH to 5, let stand for 25 min, adjust the pH to 4, heat to 65 ° C, stir for 1.3 h, and cool to obtain a silica-modified solution;

[0098] A4. Add the mixed solution A prepared in step A1 to the silica-modified solution prepared in step A3, stir evenly, heat to 58°C, react for 2.3 hours to obtain a precipitate, filter, dry, and then put it into a muffle furnace at 410°C, heat for 1.7 hours, crush, and pass through a 200-mesh sieve to obtain silica-doped aluminum composite microspheres.

[0099] The molar ratio of the potassium aluminum sulfate dodecahydrate to the ammonia water is 1:2.

[0100] The dispersant is fatty alcohol polyoxyethylene ether.

[0101] The initiator is a mixture of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, benzophenone and α-hydroxyisopropylbenzophenone in a molar ratio of 1:1:1.

[0102] The defoaming agent is dimethyl polysiloxane.

[0103] A repair construction process of a pipeline trenchless repair material is the same as that of Example 1.

[0104] Example 5

[0105] According to weight parts, 94 parts of functionalized epoxy acrylate resin, 5.5 parts of initiator, 4.5 parts of silica-doped aluminum composite microspheres, 0.9 parts of dispersant and 0.6 parts of defoamer are uniformly mixed to obtain a material for trenchless repair of pipelines.

[0106] The preparation of functionalized epoxy acrylate resin comprises the following steps:

[0107] S1. According to parts by weight, 38 parts of propylene glycol and 11 parts of maleic anhydride were mixed evenly, 0.65 parts of 2-tert-butylhydroquinone were added, and the mixture was heated to 78° C., stirred for reaction for 70 minutes, and cooled to room temperature to obtain a mixture A;

[0108] S2. According to parts by weight, 0.55 parts of triethylamine were added to the mixture A prepared in step S1, and the mixture was stirred evenly. After heating to 68° C., 59 parts of epoxy resin were added, and the mixture was stirred and reacted for 0.9 h to obtain a mixture B.

[0109] S3. Add 2.8 parts of hydroxyethyl acrylate to the mixture B prepared in step S2 according to parts by weight, stir evenly, heat to 89° C. and stir for 75 minutes to obtain a functionalized epoxy acrylate resin.

[0110] The preparation of the silicon dioxide-doped aluminum composite microspheres comprises the following steps:

[0111] A1. According to parts by weight, weigh 0.55 parts of a mixture of potassium aluminum sulfate dodecahydrate and aqueous ammonia, add it to 1.7 parts of water, and stir for 0.9 hours to obtain a mixed solution A;

[0112] A2. According to weight, weigh 1 part of sodium silicate and dissolve it in 14 parts of water, add it to 18 parts of 28% n-butanol solution, stir evenly, add 0.09 parts of vinyltrimethoxysilane, stir for 35 minutes, and obtain mixed solution B;

[0113] A3. Add 65% sulfuric acid solution by weight to the mixed solution B prepared in step A2, adjust the pH to 6, let stand for 35 minutes, adjust the pH to 5, heat to 75°C, stir for 1.8 hours, and cool to obtain a silica-modified solution;

[0114] A4. Add the mixed solution A prepared in step A1 to the silica-modified solution prepared in step A3, stir evenly, heat to 64°C, react for 2.8 hours to obtain a precipitate, filter, dry, and then put it into a muffle furnace at 480°C, heat for 2.3 hours, crush, and pass through a 200-mesh sieve to obtain silica-doped aluminum composite microspheres.

[0115] The molar ratio of the potassium aluminum sulfate dodecahydrate to the ammonia water is 1:2.

[0116] The dispersant is a mixture of fatty alcohol polyoxyethylene ether and monolauryl phosphate in a molar ratio of 1:1.

[0117] The initiator is a mixture of benzophenone and α-hydroxyisopropyl benzophenone in a molar ratio of 1:1.

[0118] The defoaming agent is a mixture of dimethyl polysiloxane and polyether siloxane in a molar ratio of 1:1.

[0119] A repair construction process of a pipeline trenchless repair material is the same as that of Example 1.

[0120] Comparative Example 1

[0121] The only difference from Example 1 is that in the composition of the material for trenchless pipeline repair, the functionalized epoxy acrylate resin is replaced by a commercially available epoxy acrylate resin.

[0122] According to weight parts, 90 parts of commercially available epoxy acrylate resin, 5 parts of initiator, 4 parts of silica-doped aluminum composite microspheres, 0.5 parts of dispersant and 0.5 parts of defoamer are uniformly mixed to obtain a material for trenchless repair of pipelines.

[0123] A repair construction process of a pipeline trenchless repair material comprises the following steps:

[0124] Q1. A glass fiber cloth, an inner membrane, an outer membrane, and an ultraviolet light protective film are made into a hose. Under vacuum conditions, the hose is infiltrated with the trenchless repair material prepared in this comparative example. After the infiltration is completed, an inner liner for pipeline repair is obtained;

[0125] Q2. Clean the inner wall surface of the damaged pipe, remove water and dry it, then drag the liner tube prepared in step Q1 into the damaged pipe, trim the liner tube according to the shape of the damaged part of the damaged pipe, and then put it into an ultraviolet lamp, seal both ends of the trimmed liner tube, and inflate the trimmed liner tube so that the inflated liner tube fits the inner wall of the damaged pipe;

[0126] Q3. Use ultraviolet automated control equipment to irradiate the inflated liner tube, and initiate polymerization and curing of the repair material through light;

[0127] Q4. After the polymerization and curing of the liner pipe in step Q3 is completed, use pipeline inspection equipment to check the condition of the repaired pipeline and clean the inside of the pipeline to complete the repair.

[0128] Comparative Example 2

[0129] The only difference from Example 1 is that in the composition of the material for trenchless pipeline repair, the silica-doped aluminum composite microspheres are replaced by modified silica, that is, the mixture of potassium aluminum sulfate dodecahydrate and ammonia water is not added in the preparation of the silica-doped aluminum composite microspheres.

[0130] The preparation of the modified silicon dioxide comprises the following steps:

[0131] A1. According to weight, weigh 1 part of sodium silicate and dissolve it in 10 parts of water, add it to 15 parts of 25% n-butanol solution, stir evenly, then add 0.06 parts of vinyltrimethoxysilane, stir for 30 minutes, and obtain mixed solution B;

[0132] A2. Add 60% sulfuric acid solution by weight to the mixed solution B prepared in step A1, adjust the pH to 5, let stand for 30 minutes, adjust the pH to 4, heat to 70°C, stir for 1 hour, cool to obtain a silica-modified liquid, heat to 60°C, react for 2 hours to obtain a precipitate, filter, dry, and then put into a muffle furnace at 450°C, heat for 2.0 hours, crush, and pass through a 200-mesh sieve to obtain modified silica.

[0133] Comparative Example 3

[0134] The only difference from Example 1 is that in the composition of the material for trenchless pipeline repair, the functionalized epoxy acrylate resin is replaced by a commercially available epoxy acrylate resin, and at the same time, the silica-doped aluminum composite microspheres are replaced by modified silica, that is, the mixture of potassium aluminum sulfate dodecahydrate and ammonia water is not added in the preparation of the silica-doped aluminum composite microspheres.

[0135] According to weight parts, 90 parts of commercially available epoxy acrylate resin, 5 parts of initiator, 4 parts of silica-doped aluminum composite microspheres, 0.5 parts of dispersant and 0.5 parts of defoamer are uniformly mixed to obtain a material for trenchless repair of pipelines.

[0136] The preparation of the modified silicon dioxide comprises the following steps:

[0137] A1. According to weight, weigh 1 part of sodium silicate and dissolve it in 10 parts of water, add it to 15 parts of 25% n-butanol solution, stir evenly, then add 0.06 parts of vinyltrimethoxysilane, stir for 30 minutes, and obtain mixed solution B;

[0138] A2. Add 60% sulfuric acid solution by weight to the mixed solution B prepared in step A1, adjust the pH to 5, let stand for 30 minutes, adjust the pH to 4, heat to 70°C, stir for 1 hour, cool to obtain a silica-modified liquid, heat to 60°C, react for 2 hours to obtain a precipitate, filter, dry, and then put into a muffle furnace at 450°C, heat for 2.0 hours, crush, and pass through a 200-mesh sieve to obtain modified silica.

[0139] A repair construction process of a pipeline trenchless repair material comprises the following steps:

[0140] Q1. A glass fiber cloth, an inner membrane, an outer membrane, and an ultraviolet light protective film are made into a hose. Under vacuum conditions, the hose is infiltrated with the trenchless repair material prepared in this comparative example. After the infiltration is completed, an inner liner for pipeline repair is obtained;

[0141] Q2. Clean the inner wall surface of the damaged pipe, remove water and dry it, then drag the liner tube prepared in step Q1 into the damaged pipe, trim the liner tube according to the shape of the damaged part of the damaged pipe, and then put it into an ultraviolet lamp, seal both ends of the trimmed liner tube, and inflate the trimmed liner tube so that the inflated liner tube fits the inner wall of the damaged pipe;

[0142] Q3. Use ultraviolet automated control equipment to irradiate the inflated liner tube, and initiate polymerization and curing of the repair material through light;

[0143] Q4. After the polymerization and curing of the liner pipe in step Q3 is completed, use pipeline inspection equipment to check the condition of the repaired pipeline and clean the inside of the pipeline to complete the repair.

[0144] Comparative Example 4

[0145] The only difference from Example 1 is that in the preparation of the silica-doped aluminum composite microspheres, vinyltrimethoxysilane is replaced by γ-aminopropyltrimethoxysilane.

[0146] The preparation of the silicon dioxide-doped aluminum composite microspheres comprises the following steps:

[0147] A1. According to parts by weight, weigh 0.5 parts of a mixture of potassium aluminum sulfate dodecahydrate and aqueous ammonia, add it to 1 part of water, and stir for 0.5 hours to obtain a mixed solution A;

[0148] A2. According to weight, weigh 1 part of sodium silicate and dissolve it in 10 parts of water, add it to 15 parts of 25% n-butanol solution, stir evenly, add 0.06 parts of γ-aminopropyltrimethoxysilane, stir for 30 minutes, and obtain mixed solution B;

[0149] A3. Add 60% sulfuric acid solution by weight to the mixed solution B prepared in step A2, adjust the pH to 5, let stand for 30 minutes, adjust the pH to 4, heat to 70°C, stir for 1 hour, and cool to obtain a silica-modified solution.

[0150] A4. Add the mixed solution A prepared in step A1 to the silica-modified solution prepared in step A3, stir evenly, heat to 60°C, react for 2 hours to obtain a precipitate, filter, dry, and then put it into a muffle furnace at 450°C, heat for 2.0 hours, crush, and pass through a 200-mesh sieve to obtain silica-doped aluminum composite microspheres.

[0151] Proven results

[0152] After the inner liner pipes obtained in the examples and comparative examples were light cured, the bending strength of the materials was tested according to the GB / T1449-2005 fiber reinforced plastic bending performance test method. The results are shown in Table 1.

[0153] Table 1

[0154]

[0155]

[0156] It is found from Example 1 to Example 5 in combination with the data in Table 1 that the bending strength of the liner pipes made of the trenchless repair material for pipelines prepared according to the technical solution of the present invention is relatively excellent.

[0157] From the data in Comparative Examples 1 and 2 combined with Table 1, it can be seen that if the epoxy acrylate resin is not functionalized in the prepared trenchless repair material for pipelines, the bending strength of the liner pipe prepared from the trenchless repair material is 435;

[0158] If the silicon dioxide is not modified in the prepared trenchless pipe repair material, the bending strength of the liner pipe prepared by the trenchless pipe repair material is 446, which is higher than the bending strength of the liner pipe prepared in Comparative Example 3, which is 388;

[0159] The above shows that modified silica, namely silica-doped aluminum composite microspheres and functionalized epoxy acrylate resin can improve the bending strength of the liner pipe.

[0160] At the same time, the data in Table 1 in combination with Comparative Examples 1, 2, 3 and Example 1 can be concluded that the epoxy acrylate resin functionalized by the technical solution of the present invention and the silica modified by the technical solution of the present invention can work synergistically to synergistically improve the mechanical properties of the inner liner pipe prepared by the trenchless repair material of the pipeline prepared by the present invention. This is because the epoxy acrylate resin that has been functionalized can maintain a uniform cross-linked state with the silica-doped aluminum composite microspheres during photocuring cross-linking polymerization. In addition, the surface of the silica particles carries unsaturated double bond groups, which can increase the steric effect between the particles. The silica particles fill the spatial position in the functionalized epoxy acrylate resin segment, so that it can form a stable support system with the silica-doped aluminum composite microspheres as nodes, thereby achieving an enhanced effect.

[0161] In Comparative Example 4, in the preparation of silica-doped aluminum composite microspheres, vinyltrimethoxysilane is replaced by γ-aminopropyltrimethoxysilane. It can be seen from Table 1 that the bending strength of the liner pipe prepared by the trenchless pipe repair material prepared in Comparative Example 4 is 485, which is lower than the bending strength of the liner pipe prepared by the trenchless pipe repair material prepared in Example 1. This indicates that if vinyltrimethoxysilane is simply replaced by the same type of substance γ-aminopropyltrimethoxysilane, the mechanical properties of the liner pipe prepared by the trenchless pipe repair material will be reduced.

[0162] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A material for trenchless pipeline repair, characterized in that: The raw materials include the following components in parts by weight: 85-95 parts of functionalized epoxy acrylate resin, 4-6 parts of initiator, 3-5 parts of silicon dioxide-doped aluminum composite microspheres, 0.5-1 parts of dispersant and 0.3-0.7 parts of defoamer.

2. The trenchless pipeline repair material according to claim 1, characterized in that: The preparation of the silicon dioxide-doped aluminum composite microspheres comprises the following steps: A1. According to weight, weigh 0.4-0.6 parts of a mixture of potassium aluminum sulfate dodecahydrate and aqueous ammonia, add 1-2 parts of water, and stir for 0.5-1h to obtain a mixed solution A; A2. According to weight, weigh 1 part of sodium silicate and dissolve it in 10-15 parts of water, add it to 15-20 parts of 20-30% n-butanol solution, stir evenly, then add 0.06-0.1 parts of vinyltrimethoxysilane, stir for 20-40 minutes, and obtain mixed solution B; A3, according to weight parts, add 50-70% sulfuric acid solution to the mixed solution B prepared in step A2, adjust the pH to 5-6, let stand for 20-40 minutes, adjust the pH to 4-5, heat to 60-80°C, stir for 1-2 hours, and cool to obtain a silica modified solution; A4. Add the mixed solution A prepared in step A1 to the silica-modified solution prepared in step A3, stir evenly, heat to 55-65°C, react for 2-3 hours to obtain a precipitate, filter, dry, then put into a muffle furnace at 400-500°C, heat for 1.5-2.5 hours, crush, and pass through a 200-mesh sieve to obtain silica-doped aluminum composite microspheres.

3. The trenchless pipeline repair material according to claim 2, characterized in that: The molar ratio of the potassium aluminum sulfate dodecahydrate to the ammonia water is 1:

2.

4. The trenchless pipeline repair material according to claim 2, characterized in that: The preparation of the functionalized epoxy acrylate resin comprises the following steps: S1. According to parts by weight, 30 to 40 parts of propylene glycol and 8 to 12 parts of maleic anhydride are uniformly mixed, 0.5 to 0.7 parts of 2-tert-butylhydroquinone are added, and the mixture is heated to 70 to 80° C., stirred for reaction for 40 to 80 minutes, and cooled to room temperature to obtain a mixture A; S2, according to parts by weight, to the mixture A prepared in step S1, add 0.4-0.6 parts of triethylamine, stir evenly, then heat to 60-70° C., add 50-60 parts of epoxy resin, stir and react for 0.5-1h to obtain a mixture B; S3. Add 2 to 3 parts of hydroxyethyl acrylate to the mixture B prepared in step S2 according to parts by weight, stir evenly, heat to 80 to 90° C., and stir to react for 60 to 80 minutes to obtain a functionalized epoxy acrylate resin.

5. The trenchless pipeline repair material according to claim 1, characterized in that: The dispersant is any one of fatty alcohol polyoxyethylene ether and monolauryl phosphate or a mixture of the two.

6. The trenchless pipeline repair material according to claim 1, characterized in that: The initiator is any one of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, benzophenone, and α-hydroxyisopropylbenzophenone, or a mixture of at least two thereof.

7. The trenchless pipeline repair material according to claim 1, characterized in that: The defoaming agent is any one of dimethyl polysiloxane and polyether siloxane or a mixture of the two.

8. The trenchless pipeline repair material according to claim 1, characterized in that: The components of the raw materials are uniformly mixed to obtain the material for trenchless repair of pipelines.

9. A repair construction process, characterized in that: Using the trenchless pipeline repair material according to any one of claims 1 to 8 comprises the following steps: Q1. The glass fiber cloth is made into a hose together with an inner membrane, an outer membrane and an ultraviolet light protection film. Under vacuum conditions, the hose is infiltrated with a material for trenchless pipeline repair. After the infiltration is completed, an inner liner for pipeline repair is obtained; Q2. Clean the inner wall surface of the damaged pipe, remove water and dry it, then drag the liner tube prepared in step Q1 into the damaged pipe, trim the liner tube according to the shape of the damaged part of the damaged pipe, and then put it into an ultraviolet lamp, seal both ends of the trimmed liner tube, and inflate the trimmed liner tube so that the inflated liner tube fits the inner wall of the damaged pipe; Q3. Use ultraviolet automated control equipment to irradiate the inflated liner tube to initiate polymerization and curing through light; Q4. After the polymerization and curing of the liner pipe in step Q3 is completed, use pipeline inspection equipment to check the condition of the repaired pipeline and clean the inside of the pipeline to complete the repair.

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