CN115011136A - Ultraviolet-curing trenchless repairing prepreg and production process thereof - Google Patents
Ultraviolet-curing trenchless repairing prepreg and production process thereof Download PDFInfo
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- 239000000463 material Substances 0.000 claims abstract description 49
- 239000000805 composite resin Substances 0.000 claims abstract description 28
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical class [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 17
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- QNODIIQQMGDSEF-UHFFFAOYSA-N (1-hydroxycyclohexyl)-phenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1(O)CCCCC1 QNODIIQQMGDSEF-UHFFFAOYSA-N 0.000 claims description 7
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- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 claims description 7
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- 230000000052 comparative effect Effects 0.000 description 12
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
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- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/10—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
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- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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- C08K5/04—Oxygen-containing compounds
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Abstract
The invention provides an ultraviolet curing trenchless repairing prepreg and a production process thereof, and relates to the technical field of pipeline repairing materials. The ultraviolet curing trenchless repairing prepreg consists of an ultraviolet curing composite resin material prepared by mixing vinyl resin, epoxy resin, methacrylic acid-beta-hydroxyethyl, PTMPTA microspheres, a photoinitiator, a thermal initiator and fumed silica and a fiber reinforced material prepared from glass fiber, carbon fiber, basalt fiber and modified nano aluminum oxide. The invention overcomes the defects of the prior art, improves the strength and mechanical property of the prepreg after the whole curing, ensures the adhesion between the resin material and the fiber material, improves the thickness of the whole curing, and is convenient for practical construction and use.
Description
Technical Field
The invention relates to the technical field of pipeline repairing materials, in particular to an ultraviolet curing trenchless repairing prepreg and a production process thereof.
Background
The urban underground pipeline refers to pipelines and auxiliary facilities for water supply, drainage, gas, heat, electric power, communication, radio and television, industry and the like in the urban range, and is an important infrastructure and a 'lifeline' for ensuring urban operation. In recent years, with the rapid development of cities, the problems of insufficient construction scale, low management level and the like of underground pipelines are obvious, and the accidents of heavy rain waterlogging, pipeline leakage explosion, road surface collapse and the like occur in some cities in succession, so that the life and property safety of people and the urban operation order are seriously influenced, and the pipelines need to be maintained and repaired in time.
The non-excavation engineering technology is a new technology for detecting, designing, constructing, repairing and updating an underground lifeline system and evaluating and managing assets by utilizing a micro-excavation or non-excavation technology, is widely applied to the updating, repairing, managing and evaluating of gas, electric power, water supply and drainage pipelines, telecommunication, wired television lines, natural gas and petroleum pipelines and the like in the conditions of passing through roads, railways, buildings, rivers, and unallowable or inconvenient excavation in downtown areas, historic site protection areas, crops and environment protection areas and the like, and is approved as an environment-friendly technology of underground facilities by the environmental agenda of the united nations.
However, the existing trenchless technology is still difficult to popularize in a large range in China, mainly because the prepreg used in the existing trenchless repairing technology is poor in strength and hardness after being cured, and the actual photocuring thickness of the existing photocuring material is relatively thin, so that the pipeline performance after actual construction is easy to be insufficient, and the actual construction is greatly disturbed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the ultraviolet curing trenchless repairing prepreg and the production process thereof, which improve the strength and mechanical property of the prepreg after the whole curing, ensure the adhesion between a resin material and a fiber material, improve the whole curing efficiency and facilitate the actual construction and use.
In order to achieve the above purpose, the technical scheme of the invention is realized by the following technical scheme:
an ultraviolet light curing trenchless repairing prepreg comprises an ultraviolet light curing composite resin material and a fiber reinforced material; the ultraviolet curing composite resin material is prepared from the following substances in parts by weight: 50-60 parts of vinyl resin, 15-20 parts of epoxy resin, 3-6 parts of methacrylic acid-beta-hydroxyethyl ester, 1-3 parts of PTMDTA microspheres, 2-3 parts of photoinitiator, 1-2 parts of thermal initiator and 0.8-1.4 parts of fumed silica; the fiber reinforced material is composed of glass fiber, carbon fiber, basalt fiber and modified nano aluminum oxide.
Preferably, the photoinitiator is a mixture of 2-hydroxy-2-methyl-1-phenyl acetone and a-hydroxycyclohexyl phenyl ketone in a mass ratio of 1: 1.
Preferably, the thermal initiator is a mixture of azobisisobutyronitrile and dimethyl azobisisobutyrate in a mass ratio of 1: 1.
Preferably, the particle size of the PTMP PTA microsphere is 20-70 μm.
Preferably, the mass ratio of the glass fiber, the carbon fiber, the basalt fiber and the modified nano-alumina in the fiber reinforced material is 7: 2: 1: 0.001.
Preferably, the modified nano-alumina is prepared by carrying out surface modification on nano-alumina in a toluene solution by using a silane coupling agent, and then washing and drying to obtain the modified nano-alumina.
The production process of the ultraviolet curing trenchless repairing prepreg comprises the following steps:
(1) preparing ultraviolet curing composite resin: mixing vinyl resin, epoxy resin and methacrylic acid-beta-hydroxyethyl ester with PTMTPTA microspheres, dispersing and stirring, adding fumed silica, continuously stirring uniformly, then adding a photoinitiator and a thermal initiator continuously, and stirring continuously to obtain ultraviolet curing composite resin for later use;
(2) fiber treatment: mixing glass fiber, carbon fiber and basalt fiber to prepare composite fiber cloth for later use;
(3) fiber cloth treatment: placing the composite fiber in a heating furnace for heat treatment, taking out the composite fiber, cooling to normal temperature, placing the composite fiber in alkali liquor for soaking, taking out the composite fiber, cleaning and drying to obtain pretreated fiber cloth for later use;
(4) preparing a fiber reinforced material: spraying modified nano-alumina into the pretreated fiber cloth, and then carrying out heat treatment to obtain a fiber reinforced material for later use;
(5) preparing a prepreg: the ultraviolet light curing composite resin is combined with the fiber reinforced material in a hand lay-up molding mode to prepare the prepreg.
Preferably, the temperature for the heat treatment of the composite fiber cloth in the step (3) is 300-400 ℃, and the treatment time is 1-2 h.
Preferably, the pH value of the alkali liquor soaked in the alkali liquor in the step (3) is 8, and the soaking time is 10-15 min.
Preferably, the temperature of the heat treatment in the step (4) is 200-.
The invention provides an ultraviolet curing trenchless repairing prepreg and a production process thereof, and compared with the prior art, the ultraviolet curing trenchless repairing prepreg has the advantages that:
(1) the invention adopts the mixture of vinyl resin, epoxy resin, methacrylic acid-beta-hydroxyethyl ester and PTMPTA microspheres, effectively improves the viscosity and the hardness of the resin material after curing, and improves the performance of the whole material;
(2) the invention adopts the glass fiber, the carbon fiber and the basalt fiber to jointly manufacture the integral framework of the fiber reinforced material, effectively ensures the integral mechanical property and stability of the material, simultaneously carries out alkaline treatment on the fiber material after heat treatment, and then sprays the modified nano aluminum oxide, so that the modified nano aluminum oxide is combined with the pores on the surface of the fiber material, and simultaneously leads the fiber material to be uniformly combined after heat treatment, and the curing property and the combination uniformity can be improved after the subsequent resin material is compounded and cured, thereby improving the integral forming effect of the material and facilitating the actual pipeline repair.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example 1:
preparing ultraviolet curing trenchless repairing prepreg:
(1) preparing ultraviolet curing composite resin: mixing 50 parts by mass of vinyl resin, 15 parts by mass of epoxy resin and 3 parts by mass of methacrylic acid-beta-hydroxyethyl ester, mixing 1 part by mass of PTMP (Polymethylacetamide) microspheres at the rotating speed of 1200r/min, dispersing and stirring for 20min, adding 0.8 part by mass of fumed silica, continuously and uniformly stirring, and then sequentially adding 1 part by mass of 2-hydroxy-2-methyl-1-phenyl acetone, 1 part by mass of a-hydroxycyclohexyl phenyl ketone, 0.5 part by mass of azobisisobutyronitrile and 0.5 part by mass of dimethyl azobisisobutyrate, and continuously stirring to obtain an ultraviolet curing composite resin for later use;
(2) fiber treatment: mixing glass fiber, carbon fiber and basalt fiber according to the mass ratio of 7: 2: 1 to prepare composite fiber cloth for later use;
(3) fiber cloth treatment: placing the composite fiber in a heating furnace, heating to 300 ℃, carrying out heat treatment for 2h, taking out, cooling to normal temperature, placing in alkali liquor with pH of 8, soaking for 10min, taking out, cleaning with ethanol, and drying at 60 ℃ to remove water to obtain pretreated fiber cloth for later use;
(4) preparing modified nano aluminum oxide: placing nano-alumina in a toluene solution, adding triethylamine and a silane coupling agent KH570, heating to 110 ℃, reacting for 1h, removing the solvent, washing with ethanol, and drying to obtain modified nano-alumina for later use;
(5) preparing a fiber reinforced material: spraying the modified nano-alumina into the pretreated fiber cloth according to the addition of 0.1%, and then heating to 200 ℃ for heat treatment for 15min to obtain a fiber reinforced material for later use;
(6) preparing a prepreg: the ultraviolet light curing composite resin is combined with the fiber reinforced material in a hand lay-up molding mode to prepare the prepreg.
Example 2:
preparing ultraviolet curing trenchless repairing prepreg:
(1) preparing ultraviolet curing composite resin: mixing 60 parts by mass of vinyl resin, 20 parts by mass of epoxy resin and 6 parts by mass of methacrylic acid-beta-hydroxyethyl ester, mixing 3 parts by mass of PTMDA microspheres at the rotating speed of 1200r/min, stirring for 20min, adding 1.4 parts by mass of fumed silica, continuously stirring uniformly, and then adding 1.5 parts by mass of 2-hydroxy-2-methyl-1-phenyl acetone, 1.5 parts by mass of a-hydroxycyclohexyl phenyl ketone, 1 part by mass of azobisisobutyronitrile and 1 part by mass of dimethyl azobisisobutyrate, and continuously stirring to obtain ultraviolet curing composite resin for later use;
(2) fiber treatment: mixing glass fiber, carbon fiber and basalt fiber according to the mass ratio of 7: 2: 1 to prepare composite fiber cloth for later use;
(3) fiber cloth treatment: placing the composite fiber in a heating furnace, heating to 400 ℃, carrying out heat treatment for 1h, taking out, cooling to normal temperature, placing in alkali liquor with pH of 8, soaking for 15min, taking out, cleaning with ethanol, and drying at 60 ℃ to remove water to obtain pretreated fiber cloth for later use;
(4) preparing modified nano aluminum oxide: placing nano-alumina in a toluene solution, adding triethylamine and a silane coupling agent KH570, heating to 110 ℃, reacting for 1h, removing the solvent, washing with ethanol, and drying to obtain modified nano-alumina for later use;
(5) preparing a fiber reinforced material: spraying the modified nano-alumina into the pretreated fiber cloth according to the addition of 0.1%, and then heating to 300 ℃ for heat treatment for 20min to obtain a fiber reinforced material for later use;
(6) preparing a prepreg: the ultraviolet light curing composite resin is combined with the fiber reinforced material in a hand lay-up molding mode to prepare the prepreg.
Comparative example 1:
preparing ultraviolet curing trenchless repairing prepreg:
(1) preparing ultraviolet curing composite resin: dispersing and stirring 60 parts of vinyl resin and 20 parts of epoxy resin for 20min at the rotating speed of 1200r/min according to the parts by mass, adding 1.4 parts of fumed silica, continuously and uniformly stirring, and then sequentially adding 1.5 parts of 2-hydroxy-2-methyl-1-phenyl acetone, 1.5 parts of a-hydroxycyclohexyl phenyl ketone, 1 part of azobisisobutyronitrile and 1 part of dimethyl azodiisobutyrate, and continuously stirring to obtain an ultraviolet curing composite resin for later use;
(2) fiber treatment: mixing glass fiber, carbon fiber and basalt fiber according to the mass ratio of 7: 2: 1 to prepare composite fiber cloth for later use;
(3) fiber cloth treatment: placing the composite fiber in a heating furnace, heating to 400 ℃, carrying out heat treatment for 1h, taking out, cooling to normal temperature, soaking in alkali liquor with the pH value of 8 for 15min, taking out, cleaning with ethanol, and drying at 60 ℃ to remove water to obtain pretreated fiber cloth for later use;
(4) preparing modified nano aluminum oxide: placing nano-alumina in a toluene solution, adding triethylamine and a silane coupling agent KH570, heating to 110 ℃, reacting for 1h, removing the solvent, washing with ethanol, and drying to obtain modified nano-alumina for later use;
(5) preparing a fiber reinforced material: spraying the modified nano-alumina into the pretreated fiber cloth according to the addition of 0.1%, and then heating to 300 ℃ for heat treatment for 20min to obtain a fiber reinforced material for later use;
(6) preparing a prepreg: the ultraviolet light curing composite resin is combined with the fiber reinforced material in a hand lay-up molding mode to prepare the prepreg.
Comparative example 2:
preparing ultraviolet curing trenchless repairing prepreg:
(1) preparing ultraviolet curing composite resin: mixing 60 parts by mass of vinyl resin, 20 parts by mass of epoxy resin and 6 parts by mass of methacrylic acid-beta-hydroxyethyl ester, mixing 3 parts by mass of PTMDA microspheres at the rotating speed of 1200r/min, stirring for 20min, adding 1.4 parts by mass of fumed silica, continuously stirring uniformly, and then adding 1.5 parts by mass of 2-hydroxy-2-methyl-1-phenyl acetone, 1.5 parts by mass of a-hydroxycyclohexyl phenyl ketone, 1 part by mass of azobisisobutyronitrile and 1 part by mass of dimethyl azobisisobutyrate, and continuously stirring to obtain ultraviolet curing composite resin for later use;
(2) fiber treatment: mixing glass fiber, carbon fiber and basalt fiber according to the mass ratio of 7: 2: 1 to prepare composite fiber cloth for later use;
(3) fiber cloth treatment: placing the composite fiber in a heating furnace, heating to 400 ℃, carrying out heat treatment for 1h, taking out, cooling to normal temperature, placing in alkali liquor with pH of 8, soaking for 15min, taking out, cleaning with ethanol, and drying at 60 ℃ to remove water to obtain a fiber reinforced material for later use;
(5) preparing a prepreg: the ultraviolet light curing composite resin is combined with the fiber reinforced material in a hand lay-up molding mode to prepare the prepreg.
Comparative example 3:
preparing ultraviolet curing trenchless repairing prepreg:
(1) preparing ultraviolet curing composite resin: mixing 60 parts by mass of vinyl resin, 20 parts by mass of epoxy resin and 6 parts by mass of methacrylic acid-beta-hydroxyethyl ester, mixing 3 parts by mass of PTMDA microspheres at the rotating speed of 1200r/min, stirring for 20min, adding 1.4 parts by mass of fumed silica, continuously stirring uniformly, and then adding 1.5 parts by mass of 2-hydroxy-2-methyl-1-phenyl acetone, 1.5 parts by mass of a-hydroxycyclohexyl phenyl ketone, 1 part by mass of azobisisobutyronitrile and 1 part by mass of dimethyl azobisisobutyrate, and continuously stirring to obtain ultraviolet curing composite resin for later use;
(2) fiber treatment: preparing glass fiber into fiber cloth for later use;
(3) fiber cloth treatment: placing the fibers in a heating furnace, heating to 400 ℃, carrying out heat treatment for 1h, taking out, cooling to normal temperature, soaking in alkali liquor with the pH value of 8 for 15min, taking out, cleaning with ethanol, and drying at 60 ℃ to remove water to obtain a fiber reinforced material for later use;
(6) preparing a prepreg: the ultraviolet light curing composite resin is combined with the fiber reinforced material in a hand lay-up molding mode to prepare the prepreg.
And (3) detection:
1. the viscosities of the UV-curable composite resin materials prepared in examples 1-2 and comparative examples 1-3 were measured, and the shear rate was measured for 30sec at a temperature of 25 deg.C -1 The dynamic viscosity under the conditions, the specific results are shown in the following table 1:
TABLE 1
| Group of | Example 1 | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Viscosity (mpa.s) | 158 | 158 | 147 | 158 | 158 |
The above table shows that the addition of the methacrylic acid-beta-hydroxyethyl ester and the PTMPTA microspheres in the resin can effectively improve the viscosity of the ultraviolet curing composite resin material, i.e., can effectively improve the adhesion between the resin material and the fiber reinforced material, improve the overall performance stability of the material, and ensure the use safety of the material.
2. Prepregs with thicknesses of 5mm, 10mm and 15mm were prepared according to the methods of the above examples 1-2 and comparative examples 1-3, and the time for complete curing of each set of prepregs under an ultraviolet lamp with a power of 1kw and a dominant wavelength of 365nm was measured at 3 ± 0.2cm, and the specific results are shown in the following table 2:
TABLE 2
As can be seen from the above table, the prepreg prepared in example 1-2 can be cured to a thickness of 15mm within 10min, and the curing efficiency is high.
2. The prepregs of 10mm after curing prepared in the above examples 1 to 2 and comparative examples 1 to 3 were subjected to mechanical property testing, and the hardness of the back surface and the illumination surface of each group of prepregs was measured, and the flexural strength and flexural modulus of each group of materials were simultaneously measured, with the results shown in table 3 below:
TABLE 3
| Group of | Example 1 | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Hardness of lighting surface | 56HBa | 55HBa | 48HBa | 54HBa | 52HBa |
| Hardness of the back surface | 53HBa | 52HBa | 40HBa | 41HBa | 37HBa |
| Bending strength | 296MPa | 292MPa | 284MPa | 272MPa | 263MPa |
| Flexural modulus | 13GPa | 13GPa | 12.5GPa | 12GPa | 12GPa |
As can be seen from the above table, the prepreg prepared in the embodiments 1-2 of the present invention has good hardness and mechanical properties after photocuring, and facilitates the actual pipeline repair processing.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The ultraviolet-curing trenchless repairing prepreg is characterized by comprising an ultraviolet-curing composite resin material and a fiber reinforced material;
the ultraviolet curing composite resin material is prepared from the following substances in parts by weight: 50-60 parts of vinyl resin, 15-20 parts of epoxy resin, 3-6 parts of methacrylic acid-beta-hydroxyethyl ester, 1-3 parts of PTMDTA microspheres, 2-3 parts of photoinitiator, 1-2 parts of thermal initiator and 0.8-1.4 parts of fumed silica;
the fiber reinforced material is composed of glass fiber, carbon fiber, basalt fiber and modified nano aluminum oxide.
2. The ultraviolet light cured trenchless repair prepreg of claim 1, wherein: the photoinitiator is a mixture of 2-hydroxy-2-methyl-1-phenyl acetone and a-hydroxycyclohexyl phenyl ketone in a mass ratio of 1: 1.
3. The ultraviolet light cured trenchless repair prepreg of claim 1, wherein: the thermal initiator is a mixture of azobisisobutyronitrile and dimethyl azobisisobutyrate in a mass ratio of 1: 1.
4. The ultraviolet light cured trenchless repair prepreg of claim 1, wherein: the particle size of the PTMTPTA microsphere is 20-70 μm.
5. The ultraviolet-curable trenchless repair prepreg of claim 1, wherein: the mass ratio of the glass fiber, the carbon fiber, the basalt fiber and the modified nano aluminum oxide in the fiber reinforced material is 7: 2: 1: 0.001.
6. The ultraviolet light cured trenchless repair prepreg of claim 1, wherein: the preparation method of the modified nano-alumina comprises the steps of carrying out surface modification on the nano-alumina in a toluene solution by adopting a silane coupling agent, and then washing and drying to obtain the modified nano-alumina.
7. The production process of the ultraviolet curing trenchless repairing prepreg is characterized by comprising the following steps of: the production process comprises the following steps:
(1) preparing ultraviolet curing composite resin: mixing vinyl resin, epoxy resin and methacrylic acid-beta-hydroxyethyl ester with PTMTPTA microspheres, dispersing and stirring, adding fumed silica, continuously stirring uniformly, then adding a photoinitiator and a thermal initiator continuously, and stirring continuously to obtain ultraviolet curing composite resin for later use;
(2) fiber treatment: mixing glass fiber, carbon fiber and basalt fiber to prepare composite fiber cloth for later use;
(3) fiber cloth treatment: placing the composite fiber in a heating furnace for heat treatment, taking out the composite fiber, cooling to normal temperature, placing the composite fiber in alkali liquor for soaking, taking out the composite fiber, cleaning and drying to obtain pretreated fiber cloth for later use;
(4) preparing a fiber reinforced material: spraying modified nano-alumina into the pretreated fiber cloth, and then carrying out heat treatment to obtain a fiber reinforced material for later use;
(5) preparing a prepreg: the ultraviolet light curing composite resin is combined with the fiber reinforced material in a hand lay-up molding mode to prepare the prepreg.
8. The production process of the ultraviolet curing trenchless repairing prepreg according to claim 7, which is characterized in that: the temperature of the heat treatment of the composite fiber cloth in the step (3) is 300-400 ℃, and the treatment time is 1-2 h.
9. The production process of the ultraviolet curing trenchless repairing prepreg according to claim 7, which is characterized in that: the pH value of the alkali liquor soaked in the alkali liquor in the step (3) is 8, and the soaking time is 10-15 min.
10. The production process of the ultraviolet curing trenchless repairing prepreg according to claim 7, which is characterized in that: the temperature of the heat treatment in the step (4) is 200-300 ℃, and the treatment time is 15-20 min.
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