CN116814043A - Resin material for non-excavation repair of gas pipeline, preparation method and application - Google Patents
Resin material for non-excavation repair of gas pipeline, preparation method and application Download PDFInfo
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- CN116814043A CN116814043A CN202211278353.9A CN202211278353A CN116814043A CN 116814043 A CN116814043 A CN 116814043A CN 202211278353 A CN202211278353 A CN 202211278353A CN 116814043 A CN116814043 A CN 116814043A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
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- 239000002041 carbon nanotube Substances 0.000 claims abstract description 14
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- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 claims description 4
- VYKXQOYUCMREIS-UHFFFAOYSA-N methylhexahydrophthalic anhydride Chemical compound C1CCCC2C(=O)OC(=O)C21C VYKXQOYUCMREIS-UHFFFAOYSA-N 0.000 claims description 4
- AHDSRXYHVZECER-UHFFFAOYSA-N 2,4,6-tris[(dimethylamino)methyl]phenol Chemical compound CN(C)CC1=CC(CN(C)C)=C(O)C(CN(C)C)=C1 AHDSRXYHVZECER-UHFFFAOYSA-N 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
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- LTVUCOSIZFEASK-MPXCPUAZSA-N (3ar,4s,7r,7as)-3a-methyl-3a,4,7,7a-tetrahydro-4,7-methano-2-benzofuran-1,3-dione Chemical compound C([C@H]1C=C2)[C@H]2[C@H]2[C@]1(C)C(=O)OC2=O LTVUCOSIZFEASK-MPXCPUAZSA-N 0.000 claims description 2
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- 125000001931 aliphatic group Chemical group 0.000 claims description 2
- DJUWPHRCMMMSCV-UHFFFAOYSA-N bis(7-oxabicyclo[4.1.0]heptan-4-ylmethyl) hexanedioate Chemical compound C1CC2OC2CC1COC(=O)CCCCC(=O)OCC1CC2OC2CC1 DJUWPHRCMMMSCV-UHFFFAOYSA-N 0.000 claims description 2
- ITZGNPZZAICLKA-UHFFFAOYSA-N bis(oxiran-2-ylmethyl) 7-oxabicyclo[4.1.0]heptane-3,4-dicarboxylate Chemical compound C1C2OC2CC(C(=O)OCC2OC2)C1C(=O)OCC1CO1 ITZGNPZZAICLKA-UHFFFAOYSA-N 0.000 claims description 2
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Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of non-excavation repair of gas pipelines, and particularly relates to a resin material for non-excavation repair of gas pipelines, a preparation method and application thereof. The resin material of the present invention comprises the following components: 10-20 parts of aliphatic epoxy resin, 80-90 parts of bisphenol A epoxy resin, 40-60 parts of anhydride curing agent, 2-5 parts of accelerator, 40-60 parts of aluminum hydroxide and 15-20 parts of carbon nano tube. After the resin material is prepared into the lining structure, the ring stiffness of the lining structure is not less than 3KN/m 2 The bursting pressure is not less than 3.5MPa, the bending modulus is not less than 5800MPa, and the bending is not less thanThe bending strength is not less than 74MPa, the tensile strength is not less than 182MPa, the composite mechanical property is good, and the requirements of non-excavation repair of the gas pipeline can be met.
Description
Technical Field
The invention belongs to the technical field of non-excavation repair of gas pipelines, and particularly relates to a resin material for non-excavation repair of gas pipelines, a preparation method and application thereof.
Background
The gas pipe is subjected to the dual effects of the external environment and the internal gas during use, and in some cases, the problem that the gas pipe is defective and needs to be repaired may occur.
The gas pipeline repairing technology has long been applied, and common gas pipeline repairing technologies include a live fire welding reinforcing repairing technology, a pipeline replacement repairing technology, a mechanical clamp repairing technology and a composite material reinforcing repairing technology. The welding reinforcing repair technology of dynamic fire welding refers to welding at the defect part of a pipeline by adopting reinforcing materials and combining welding operation, but the welding operation is carried out under the condition of continuous gas conveying, so that safety problems such as fire accidents and the like are frequent. The pipeline replacement and repair technology is a technology for cutting and replacing a new pipeline at a defective part of the pipeline, and has the advantages of long time period, large workload, influence on gas transportation and the like in actual work although the pipeline replacement and repair technology has good effect. The mechanical fixture repairing technology is to cover the fixture outside the pipeline defect to realize the leakage blocking. Although convenient, the mechanical fixture repair technology is often used for repairing emergency gas pipelines, and has the defects of unsatisfactory corrosion resistance, weak reinforcement durability and the like. The composite material reinforcing and repairing technology is characterized in that a reinforcing layer is formed at the defect position of the pipeline through fibers and resin materials, but because fuel gas is extremely dangerous gas, the composite material reinforcing and repairing technology has certain requirements on comprehensive mechanical properties such as pressure resistance, compression resistance and tensile properties of the pipeline, and the composite material reinforcing and repairing technology also has potential safety hazards.
At present, no example of applying the inversion lining method to gas pipeline restoration is found in China, and the application of the inversion lining method to gas pipeline restoration is only at a theoretical level. The method is a repairing method for forming a pipeline lining after a hose impregnated with resin is placed in an original pipeline in a turnover or pulling mode and is solidified. The in-situ curing method can be divided into two processes of turnover type and pull-in type according to different modes of entering the hose into the original pipeline. The curing process of the hose currently comprises a hot water curing method, a steam curing method and an ultraviolet curing method, and the main process and application of the in-situ curing method are shown in table 1.
Table 1 major in situ curing process and application
In repairing gas pipelines, a repair material of CIPP is traditionally used: the resin and the reinforced fiber have certain limitations, have poor comprehensive mechanical properties such as corrosion resistance, erosion resistance, ring stiffness, bursting pressure, stretching and bending deformation performance and the like, restrict the application of the CIPP method in repairing the gas pipeline, are unsuitable for pipelines with corrosive media and high-speed gas and liquid conveying in the pipeline and certain pressure, and particularly have higher requirements on two indexes of ring stiffness and bursting pressure. The ring rigidity and bursting pressure of the existing non-pressure pipeline are respectively 0.5-1KN and 1.2MPa. In the related standards, the requirements on the ring rigidity and the bursting pressure of the pressure pipeline are respectively as follows: more than or equal to 2KN and more than or equal to 3.5MPa.
In view of the above, the invention provides a resin material for non-excavation repair of a gas pipeline, a preparation method and application thereof. The gas pipeline can be repaired under the condition that the pavement is not opened, the influence on traffic and surrounding environment is reduced, the construction cost is reduced, and inconvenience is not brought to resident trip.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a resin material for non-excavation repair of a gas pipeline, a preparation method and application.
The aim of the invention is realized by the following technical scheme:
the resin material for the non-excavation repair of the gas pipeline comprises the following components in parts by weight: 10-20 parts of aliphatic epoxy resin, 80-90 parts of bisphenol A epoxy resin, 40-60 parts of anhydride curing agent, 2-5 parts of accelerator and 40-60 parts of aluminum hydroxide15-20 parts of carbon nano tube (tube diameter of 60-90nm, length of 10-30um, specific surface area of 40-60 m) 2 /g)。
In the invention, the aliphatic epoxy resin is mainly used for improving the mechanical property of the material and increasing the mechanical strength of the repair material in actual use. However, the aliphatic epoxy resin has the problem of low material hardness, and in order to solve the problem, the bisphenol A epoxy resin is added, so that the bisphenol A epoxy resin is mainly used for overcoming the defect of low material hardness when the aliphatic epoxy resin is used, and the material cost of the repairing material can be reduced. The anhydride curing agent is used as a latent curing agent, the storage life of the material is prolonged, the repair material can be prefabricated in a factory, and then the repair material is conveniently formed by thermal curing in site. In the repairing material, the viscosity is difficult to control and ideal viscosity repairing material products are difficult to obtain in preparation, in order to solve the problem, the problem is solved by summarizing multiple trial and error tests, the viscosity of the repairing material can be well controlled by adding aluminum hydroxide into the repairing material system (the principle is that the content of silicon dioxide and sodium oxide in the aluminum hydroxide, the particle size distribution and the like have great influence on the viscosity of resin, so that the content of substances is controlled, specific surface area parameters, the particle size distribution range and the like in a certain interval range are screened to ensure that the viscosity of the material is in a proper range) (the implementation steps are that silicon dioxide is controlled to be below 0.02% -0.04%, sodium oxide is controlled to be between 0.15 and 0.18%, the particle size distribution is 150-180 mu m) (the carbon nano tube adjusts the viscosity, the length and the specific surface area of the carbon nano tube have a certain influence on the viscosity, and the carbon nano tube and the aluminum hydroxide form a random network structure which is stacked and staggered similarly, and the resin can be fixed, so that the purpose of controlling the viscosity is achieved, the parameters are that the tube diameter is 60-90nm, the length is 10-30 mu m, and the specific surface area is 40 m 2 And/g), thereby improving the wettability of the resin material with the fiber hose. Furthermore, the toughness of the repairing material is poor, and the toughness of the repairing material is obviously improved after the carbon nano tube is added into the repairing material in order to improve the toughness of the repairing material, so that the defects existing in the repairing material are overcome.
Further, the aluminum hydroxide of the invention is high white filler aluminum hydroxide produced by the middle aluminum Shandong Co Ltd, and the internal control standard Q/Chalco A014-2010 is the brand H-WF-10.
In the repairing material of the present invention, functional auxiliary agents may be added according to actual needs, for example, an appropriate amount of defoaming agent, thixotropic agent, etc. may be added to the repairing material.
Preferably, the resin material comprises the following components in parts by weight: 15 parts of aliphatic epoxy resin, 85 parts of bisphenol A epoxy resin, 50 parts of anhydride curing agent, 3 parts of accelerator, 45.9 parts of aluminum hydroxide and 15.3 parts of carbon nano tubes.
Further, the aliphatic resin is selected from one or more of 3, 4-epoxycyclohexylmethyl-3, 4-epoxyhexylcarbonate, bis (3, 4-epoxycyclohexylmethyl) adipate and 4, 5-epoxycyclohexane-1, 2-dicarboxylic acid diglycidyl ester; most preferred is (3, 4-epoxycyclohexylmethyl-3, 4-epoxyhexyl carbonate).
And/or the anhydride curing agent is selected from one or more of methyl hexahydrophthalic anhydride and methyl nadic anhydride; most preferred is (methyl hexahydrophthalic anhydride).
And/or the accelerator is selected from one or more of 2-ethyl-4-methylimidazole, N-dimethylbenzylamine and 2,4, 6-tris (dimethylaminomethyl) phenol; most preferred are (N, N-dimethylbenzylamine, 2,4, 6-tris (dimethylaminomethyl) phenol).
The invention provides a preparation method of the resin material for non-excavation repair of a gas pipeline, which comprises the following steps:
s1, weighing the components according to parts by weight, and uniformly mixing aliphatic epoxy resin, bisphenol A epoxy resin, anhydride curing agent and accelerator (stirring at 1230-1300r/min at 25 ℃ according to sequence) to obtain a resin mixture; mixing is performed in a stirred vessel, and an appropriate amount of defoamer may be added.
S2, adding aluminum hydroxide and carbon nanotubes into the resin mixture, adjusting the viscosity to 500-800mPa.s (the viscosity is detected by using a viscosity instrument), and uniformly stirring to obtain the resin material.
The invention provides application of the resin material for the non-excavation repair of the gas pipeline, wherein the application comprises preparation of a lining structure for the non-excavation repair of the gas pipeline.
Further, the lining structure comprises an inner membrane and a fiber hose which are all tubular, wherein the outer side of the inner membrane is fixedly sleeved with the fiber hose, or the outer side of the fiber hose is fixedly sleeved with the inner membrane, and the lining structure further comprises a repairing resin layer, and the repairing resin layer is filled with resin materials for coating the fiber hose.
Further, the inner film is a PE film or a TPU film; the fiber hose is formed by seamlessly weaving aramid fiber or polyester fiber.
Further, the thickness of the inner film ranges from 0.8 mm to 1mm; the thickness range of the fiber hose is 3-5mm; the thickness of the repair resin layer ranges from 3 mm to 7mm.
Further, the inner diameters of the inner film, the fiber hose and the repair resin layer are all 150-1200mm.
Further, when the resin material is filled into the repairing resin layer, the outer side of the inner membrane is fixedly sleeved with a fiber hose.
Further, when the lining structure is used for repairing a gas pipeline, the inner side surface of the repairing resin layer is in contact with the inner film, and the outer side surface of the repairing resin layer is in contact with the inner side wall of the gas pipeline.
Further, the weaving lines of the fiber hose are net-shaped.
Further, the weaving density of the fiber hose ranges from 4*4 to 8 x 8/cm 2 。
Further, the diameter of the braided wire of the fiber hose ranges from 1mm to 4mm.
Further, the fiber hose is made of aramid fiber or carbon fiber or terylene.
Further, the fixing mode is glue bonding or hot melt bonding.
The beneficial effects of the invention are as follows:
1. the resin material is of a latent type, so that the lining structure can be made into a semi-finished product in a factory, then the semi-finished product is conveyed to a construction site, and is cured by hot water or steam, the curing temperature is between 80 and 100 ℃, and the curing time is 1 to 2 hours, so that the construction requirement of urban rush-repair engineering can be met.
2. Compared with a drainage pipeline, the special gas pipeline has higher requirements on repairing materials. To this, research and development a special material, can satisfy the gas medium characteristic requirement simultaneously, more can reduce construction cost, extension pipeline life, simultaneously, need not open the road surface in the work progress and set up the fender that encloses, do not exert an influence to the resident trip around, reach the effect that does not influence the life of people. The ring stiffness of the cured lining structure is not less than 3KN/m 2 The bursting pressure is not less than 3.5MPa, the bending modulus is not less than 5800MPa, the bending strength is not less than 74MPa, the tensile strength is not less than 182MPa, and the composite material has good comprehensive mechanical properties.
Drawings
FIG. 1 is a schematic cross-sectional view of a liner material of the present invention;
it should be noted that the lining material of the present invention is soft, and thus the lining material of the present invention is drawn in a circular shape for convenience of drawing and viewing;
FIG. 2 is a schematic cross-sectional view of the lining material of the present invention after filling with a repair material;
it should be noted that, after the lining material of the present invention is filled with the repair material, the repair material is soft before solidification and hard after solidification, and the cross-sectional shape of the lining material of the present invention after filling with the repair material is mainly determined based on the shape of the inner wall of the pipeline, and is almost regular round;
FIG. 3 is a schematic cross-sectional view of the lining material of the present invention after filling with a repair material and used for pipeline repair.
In the figure, 1, an inner membrane; 2. a fiber hose; 3. repairing the resin layer; 4. a gas pipeline.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
The invention provides a resin material for non-excavation repair of a gas pipeline, which comprises the following components in parts by weight: 10-20 parts of aliphatic epoxy resin, 80-90 parts of bisphenol A epoxy resin, 40-60 parts of anhydride curing agent, 2-5 parts of accelerator, 40-60 parts of aluminum hydroxide and 15-20 parts of carbon nano tube. The preparation method of the repair material comprises the following steps:
s1, adding aliphatic epoxy resin, bisphenol A epoxy resin, acid anhydride curing agent and accelerator into a stirring container according to a proportion, adding a proper amount of defoaming agent, and stirring for a certain time by using a stirrer to obtain a uniformly mixed resin mixture;
s2, adding aluminum hydroxide and carbon nano tubes into the resin mixture, adjusting the viscosity to 500-800mPa.s, and uniformly stirring to obtain the resin material with latent characteristics.
In order to better practice the present invention, some examples of the resin materials of the present invention and comparative example formulations are given below, as shown in Table 2. Wherein the aliphatic epoxy resin is 3, 4-epoxy cycloethyl methyl-3, 4-epoxy hexyl carbonate, the anhydride curing agent is methyl hexahydrophthalic anhydride, and the accelerator is N, N-dimethylbenzylamine.
Table 2 repair Material examples 1-5 and comparative examples 1-5 formulations (parts by weight)
Preparing a lining structure: and weaving the polyester fiber hose of 3000D by using a braiding machine, and then adhering the inner layer film and the outer layer film on the fiber hose by using adhesive, wherein the inner layer film and/or the outer layer film are/is made of PE (polyethylene) materials. And taking 10 sections of fiber hoses, vacuumizing the 10 sections of fiber hoses through a material pressing platform respectively, and uniformly filling the same amount of the repairing materials of the examples 1-5 and the comparative examples 1-5 into the 10 sections of fiber hoses respectively to obtain 10 sections of lining structures with latent characteristics.
The 10 sections of lining structures obtained are cured and molded, and are respectively heated and cured under the steam condition of 80 ℃, and then mechanical property tests are carried out by adopting national standards of GB/T5210, GB/T1449, GB/T10002.3, GB/T15560 and GB/T5210, and the detection results are shown in Table 3:
TABLE 3 Performance test results
As can be seen from Table 3, the cured lining structure of the invention has a pressure resistance of more than 2.5MPa, a flexural modulus of not less than 5800MPa, a flexural strength of not less than 74MPa, a tensile strength of not less than 182MPa, and good comprehensive mechanical properties, and at the same time, the curing time is 1-2 hours (if the curing agent is simply added, the reaction is accelerated, too much heat is generated to cause that many materials are solidified without the chemical reaction, and poor curing results are generated).
Further, as can be obtained from the test results of comparative examples 1 to 4, when the amount of bisphenol a type epoxy resin used is insufficient, the flexural strength, flexural modulus and tensile strength are significantly reduced, thereby indicating that bisphenol a type epoxy resin has a relatively large influence on mechanical properties; when no aluminum hydroxide is added, the tensile strength index is reduced, so that the consumption of the aluminum hydroxide is reduced, the viscosity of the repairing material is reduced, the resin cannot be well infiltrated and flows in the fiber layer, and certain mechanical properties are further influenced; when the carbon nano tube is not added, the mechanical index is also reduced to a certain extent, thereby indicating that the reduction of the carbon nano tube reduces the mechanical index of the repairing material while reducing the toughness.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (10)
1. The resin material for the non-excavation repair of the gas pipeline is characterized by comprising the following components in parts by weight: 10-20 parts of aliphatic epoxy resin, 80-90 parts of bisphenol A epoxy resin, 40-60 parts of anhydride curing agent, 2-5 parts of accelerator, 40-60 parts of aluminum hydroxide and 15-20 parts of carbon nano tube.
2. The resin material for trenchless repairing of gas pipelines of claim 1, wherein the aliphatic resin is selected from one or more of 3, 4-epoxycyclohexylmethyl-3, 4-epoxyhexylcarbonate, bis (3, 4-epoxycyclohexylmethyl) adipate, 4, 5-epoxycyclohexane-1, 2-dicarboxylic acid diglycidyl ester;
and/or the anhydride curing agent is selected from one or more of methyl hexahydrophthalic anhydride and methyl nadic anhydride;
and/or the accelerator is selected from one or more of 2-ethyl-4-methylimidazole, N-dimethylbenzylamine and 2,4, 6-tris (dimethylaminomethyl) phenol.
3. The method for producing a resin material for trenchless repairing a gas pipeline according to claim 1 or 2, comprising the steps of:
s1, weighing components according to parts by weight, and uniformly stirring aliphatic epoxy resin, bisphenol A epoxy resin, anhydride curing agent and accelerator to obtain a resin mixture;
s2, adding aluminum hydroxide and carbon nanotubes into the resin mixture to enable the viscosity to reach 500-800mPa.s, thus obtaining the resin material.
4. Use of a resin material for trenchless rehabilitation of gas pipelines according to claim 1 or 2, characterized in that the use comprises the preparation of a lining structure for trenchless rehabilitation of gas pipelines.
5. Use according to claim 4, characterized in that the lining structure comprises an inner membrane (1) and a fiber hose (2), both of which are tubular, the outer side of the inner membrane (1) is fixedly sleeved with the fiber hose (2), or the outer side of the fiber hose (2) is fixedly sleeved with the inner membrane (1), and further comprises a repair resin layer (3), the repair resin layer (3) is filled with a resin material coating the fiber hose (2).
6. Use according to claim 5, characterized in that the inner film (1) is a PE film or a TPU film; the fiber hose (2) is formed by seamlessly knitting aramid fiber or polyester fiber.
7. Use according to claim 5, characterized in that the thickness of the inner film (1) ranges from 0.8 to 1mm; the thickness range of the fiber hose (2) is 3-5mm; the thickness of the repair resin layer (3) ranges from 3 mm to 7mm.
8. Use according to claim 5, characterized in that the inner diameter of the inner membrane (1), the fibre hose (2) and the repair resin layer (3) is in the range of 150-1200mm.
9. Use according to claim 5, characterized in that the outer side of the inner membrane (1) is fixedly sleeved with a fibre hose (2) when the resin material is filled into the repair resin layer (3).
10. The use according to claim 5, wherein when the lining structure is used for repairing a gas pipeline, the inner side surface of the repair resin layer (3) is in contact with the inner film (1), and the outer side surface is in contact with the inner side wall of the gas pipeline (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211278353.9A CN116814043A (en) | 2022-10-19 | 2022-10-19 | Resin material for non-excavation repair of gas pipeline, preparation method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211278353.9A CN116814043A (en) | 2022-10-19 | 2022-10-19 | Resin material for non-excavation repair of gas pipeline, preparation method and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116814043A true CN116814043A (en) | 2023-09-29 |
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| CN202211278353.9A Pending CN116814043A (en) | 2022-10-19 | 2022-10-19 | Resin material for non-excavation repair of gas pipeline, preparation method and application |
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| CN (1) | CN116814043A (en) |
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