Clean and environment-friendly ultraviolet curing resin containing solid photoinitiator as well as preparation method and application of clean and environment-friendly ultraviolet curing resin

Abstract

The invention discloses clean and environment-friendly ultraviolet curing resin containing a solid photoinitiator as well as a preparation method and application of the clean and environment-friendly ultraviolet curing resin, and belongs to the technical field of ultraviolet curing resin. The clean and environment-friendly ultraviolet curing resin is prepared from the following raw materials in parts by mass: 70 to 90 parts of bisphenol A epoxy acrylate, 10 to 30 parts of tetrahydrofuran acrylate and 2 to 4 parts of 2-hydroxy-4 '-(2-hydroxyethoxy)-2-methyl propiophenone. Through detection, water soaked in the clean and environment-friendly ultraviolet curing resin meets the GB 5749-2022 standard, it is proved that the clean and environment-friendly ultraviolet curing resin can be used for in-situ curing repair of water supply pipelines, the mechanical property is good after curing, the bending strength reaches 77.21-81.55 MPa, the bending modulus is 1.54-1.78 GPa, the tensile strength reaches 75.39-79.46 MPa, and the Barcol hardness is 27.63-28.26 HBa.

Description

Technical Field

[0001] The invention relates to the technical field of ultraviolet light-curing resins, and in particular to a clean and environmentally friendly ultraviolet light-curing resin containing a solid photoinitiator, and a preparation method and application thereof. Background Art

[0002] With the change of service life of underground water supply pipelines and the environment around the pipes, "leakage" has become the main disease of water supply network. In addition, due to the hidden diseases of water supply network, road collapse accidents caused by aging, leakage and burst of pipelines are frequent. Water supply network diseases have seriously affected the daily life of residents and the development of social economy, and may even cause major casualties and economic property losses. Therefore, the renovation of water supply network has attracted much attention. For pipelines with safety hazards, if traditional comprehensive excavation repair is adopted, not only the construction time is long, the traffic is affected, but also the environment is polluted and the comprehensive cost is high. Compared with traditional comprehensive excavation repair, trenchless repair technology has attracted much attention due to its advantages of low construction noise, low cost investment, high repair efficiency and less damage to the environment. Among them, ultraviolet light curing in situ repair method (UV-CIPP) is a commonly used trenchless repair method. The UV-CIPP repair method has a short curing time, consumes less energy and has low carbon emissions. In recent years, it has been widely used in the field of trenchless repair of urban buried drainage pipelines.

[0003] However, there is still little research on UV-curable materials for in-situ repair of water supply pipes, and most resin materials such as (unsaturated polyesters and vinyl esters) will release styrene gas during the curing process, affecting the quality of water in the pipe and the surrounding air, causing drinking water safety problems in water supply pipes. Currently commonly used UV-curable materials also contain styrene monomers, which are Class 2B carcinogens. In addition, styrene has serious harm to the environment, especially the pollution of surface water, soil, atmosphere and drinking water, etc. Special attention should be paid. For UV-curing repair of water supply pipe networks, its harmfulness has not been effectively solved, which is a key issue hindering the promotion and application of UV-curing repair technology in water supply pipe networks.

[0004] Therefore, in this field, there is an urgent need to develop a cost-effective and eco-friendly clean and environmentally friendly UV-curable resin material, and it is also necessary to ensure that the mechanical properties of the material meet the existing material standards to meet the normal use of water supply pipelines. Summary of the invention

[0005] The purpose of the present invention is to provide a clean and environmentally friendly ultraviolet light-curing resin containing a solid photoinitiator and a preparation method and application thereof, so as to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] One of the technical solutions of the present invention is a clean and environmentally friendly ultraviolet light-curing resin containing a solid photoinitiator. The raw materials include, by weight: 70 to 90 parts of bisphenol A epoxy acrylate (as an oligomer), 10 to 30 parts of tetrahydrofuran acrylate (as a diluent), and 2 to 4 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (as a solid photoinitiator).

[0008] Each component of the ultraviolet light-cured resin of the present invention does not contain styrene monomers, so styrene will not be released during the curing process, which is clean and environmentally friendly. Moreover, bisphenol A epoxy acrylate has a fast curing speed and good toughness and hardness. In addition, tetrahydrofuran acrylate molecules contain tetrahydrofuran rings and acrylate double bonds at the same time, and this structure enables tetrahydrofuran acrylate to show high reactivity and low shrinkage during light curing, and the introduction of tetrahydrofuran rings can also enhance the rigidity and stability of polymer molecules. Therefore, using tetrahydrofuran acrylate as a diluent is conducive to further improving the mechanical properties of the resin after curing compared to other diluents, and the cured product is flat, substantially free of cracks and bubbles.

[0009] Furthermore, the raw materials include, by mass, 80 parts of bisphenol A epoxy acrylate, 20 parts of tetrahydrofuran acrylate, and 3 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

[0010] The second technical solution of the present invention: The preparation method of the above-mentioned clean and environmentally friendly UV-curable resin containing a solid photoinitiator comprises the following steps:

[0011] Tetrahydrofuran acrylate and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone are added to bisphenol A epoxy acrylate in sequence under continuous heating, mixed evenly, and bubbles are removed to obtain the clean and environmentally friendly ultraviolet light-curing resin containing a solid photoinitiator.

[0012] Further, tetrahydrofuran acrylate is added and stirred for 3 to 5 minutes; and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone is added and stirred for 3 to 5 minutes.

[0013] Furthermore, the heating temperature is 60-65°C.

[0014] Furthermore, the stirring speed is 1000-2000 rpm.

[0015] Furthermore, the specific operation of removing bubbles is: extracting bubbles with vacuum negative pressure for 5 to 10 minutes.

[0016] The third technical solution of the present invention: Application of the above-mentioned clean and environmentally friendly UV-curable resin containing solid photoinitiator in UV-curing in-situ repair of water supply pipelines.

[0017] Furthermore, the specific operation of the UV-curing in-situ repair of the water supply pipeline is: coating or pouring the clean and environmentally friendly UV-curing resin containing the solid photoinitiator on the part of the water supply pipeline to be repaired, and curing it under the irradiation of a UV lamp.

[0018] Furthermore, the power of the ultraviolet lamp is 50mW / cm 2 The irradiation time is 8 to 10 minutes.

[0019] The present invention discloses the following technical effects:

[0020] The invention provides a clean and environment-friendly ultraviolet light-curing resin containing a solid photoinitiator. The resin has reasonable configuration, convenient processing, cleanness and environment-friendliness. Water soaked in the clean and environment-friendly ultraviolet light-curing resin containing a solid photoinitiator meets the GB 5749-2022 standard after detection, which proves that the clean and environment-friendly ultraviolet light-curing resin containing a solid photoinitiator can be used for in-situ curing and repairing of water supply pipes, and has good mechanical properties after curing, with a bending strength of 77.21 to 81.55 MPa, a bending modulus of 1.54 to 1.78 GPa, a tensile strength of 75.39 to 79.46 MPa, and a Barcol hardness of 27.63 to 28.26 HBa. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The present invention provides a preparation flow chart and a curing flow chart for the clean and environmentally friendly ultraviolet light-curable resin containing a solid photoinitiator. DETAILED DESCRIPTION

[0023] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0024] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0025] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0026] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0027] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0028] The invention provides a clean and environment-friendly ultraviolet light-curing resin containing a solid photoinitiator. The raw materials include, by weight, 70 to 90 parts of bisphenol A epoxy acrylate (as an oligomer), 10 to 30 parts of tetrahydrofuran acrylate (as a diluent), and 2 to 4 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (as a solid photoinitiator).

[0029] As a preferred embodiment of the present invention, the raw materials of the clean and environmentally friendly UV-curable resin containing a solid photoinitiator include, by weight: 80 parts of bisphenol A epoxy acrylate, 20 parts of tetrahydrofuran acrylate, and 3 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

[0030] The present invention also provides a method for preparing the above-mentioned clean and environmentally friendly ultraviolet light-curable resin containing a solid photoinitiator, comprising the following steps:

[0031] Tetrahydrofuran acrylate is added to bisphenol A epoxy acrylate under continuous heating, and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone is added after stirring for 3 to 5 minutes, and then the bubbles are removed to obtain the clean and environmentally friendly ultraviolet light-curing resin containing the solid photoinitiator.

[0032] As a preferred embodiment of the present invention, the preparation method comprises more specific preparation steps (the corresponding preparation process is as follows Figure 1As shown, the oligomer is bisphenol A epoxy acrylate, the diluent is tetrahydrofuran acrylate, and the photoinitiator is 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone):

[0033] (1) Place a beaker containing oligomer bisphenol A epoxy acrylate in a DF-101S heat-collecting magnetic stirrer, heat it in a water bath to 60-65°C and maintain the constant temperature;

[0034] (2) adding diluent tetrahydrofuran acrylate to the bisphenol A epoxy acrylate of step (1), stirring with a JJ-1100W Bona Technology electric stirrer, and mixing evenly to obtain a mixture 1;

[0035] (3) adding a photoinitiator 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone to the mixture 1 of step (2), stirring with a JJ-1100W Bona Technology electric stirrer, and mixing evenly to obtain a mixture 2;

[0036] (4) The mixture 2 obtained in step (3) is placed in a LFDS630 digital display 220V vacuum negative pressure pump for 5 to 10 minutes to extract bubbles, thereby obtaining the clean and environmentally friendly UV-curable resin containing the solid photoinitiator.

[0037] As a preferred embodiment of the present invention, the step (1) of placing the beaker containing oligomer bisphenol A epoxy acrylate into a DF-101S heat-collecting magnetic stirrer, heating it in a water bath to 60-65°C and then maintaining a constant temperature specifically comprises: firstly adding an appropriate amount of water into the DF-101S heat-collecting magnetic stirrer, placing the beaker containing oligomer bisphenol A epoxy acrylate therein, then preheating to 60-65°C, and then maintaining a constant temperature for a period of time until the fluidity of the bisphenol A epoxy acrylate is good.

[0038] As a preferred embodiment of the present invention, the stirring speed in step (2) is 1000-2000 rpm and the time is 3-5 min.

[0039] As a preferred embodiment of the present invention, the stirring speed in step (3) is 1000-2000 rpm and the time is 3-5 min.

[0040] As a preferred embodiment of the present invention, the step (4) of allowing the mixture 2 to stand in a LFDS630 digital display 220V vacuum negative pressure pump for 5 to 10 minutes to extract bubbles specifically includes: first, placing the beaker containing the mixture 2 into the LFDS630 digital display 220V vacuum negative pressure pump and covering it with a lid, then tightening the valves on both sides, reducing the pressure to -100psi, and finally placing it at a constant pressure for 5 to 10 minutes until the bubbles are completely eliminated.

[0041] The present invention also provides the use of the clean and environmentally friendly ultraviolet light-curing resin containing a solid photoinitiator in ultraviolet light-curing in-situ repair of water supply pipelines.

[0042] As a preferred embodiment of the present invention, the specific operation of the UV-curing in-situ repair of the water supply pipe is: coating or pouring the clean and environmentally friendly UV-curing resin containing a solid photoinitiator on the water supply pipe to be repaired, and curing it under the irradiation of an ultraviolet lamp.

[0043] As a preferred embodiment of the present invention, the power of the ultraviolet lamp is 50mW / cm 2 The irradiation time is 8 to 10 minutes.

[0044] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0045] All raw materials used in the specific implementation of the present invention are common commercial products, among which the brand of bisphenol A epoxy acrylate is RY1101, which is purchased from Jiangsu Kailin Ruiyang Chemical Co., Ltd.

[0046] Example 1

[0047] A clean and environment-friendly ultraviolet light-curing resin containing a solid photoinitiator comprises the following raw materials by weight: 70 parts of bisphenol A epoxy acrylate, 30 parts of tetrahydrofuran acrylate and 2 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

[0048] The preparation steps of the clean and environmentally friendly UV-curable resin containing a solid photoinitiator are as follows:

[0049] (1) First, add an appropriate amount of water to a DF-101S heat-collecting magnetic stirrer, place a beaker containing oligomer bisphenol A epoxy acrylate in it, and then preheat to 65°C, and then keep the temperature constant for a period of time until the fluidity of bisphenol A epoxy acrylate is good, and continue to maintain the constant temperature;

[0050] (2) adding diluent tetrahydrofuran acrylate to the bisphenol A epoxy acrylate of step (1), stirring with a JJ-1100W Bona Technology electric stirrer, mixing evenly, to obtain a mixture 1; wherein the stirring speed is 1500 rpm, and the stirring time is 5 min;

[0051] (3) adding a solid photoinitiator 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone to the mixture of step (2), stirring with a JJ-1100W Bona Technology electric stirrer, mixing evenly, to obtain a mixture 2; wherein the stirring speed is 1500 rpm, and the stirring time is 5 min;

[0052] (4) The mixture 2 obtained in step (3) is placed in a LFDS630 digital display 220V vacuum negative pressure pump and the lid is closed. Then, the valves on both sides are tightened, the pressure is reduced to -100 psi, and finally, the pressure is kept constant for 8 minutes until the bubbles are completely eliminated to obtain a resin mixture that is substantially free of bubbles and is uniformly mixed, i.e., a clean and environmentally friendly UV-curable resin containing a solid photoinitiator.

[0053] Example 2

[0054] A clean and environment-friendly ultraviolet light-curing resin containing a solid photoinitiator comprises the following raw materials by weight: 80 parts of bisphenol A epoxy acrylate, 20 parts of tetrahydrofuran acrylate and 3 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

[0055] The preparation steps of the clean and environmentally friendly UV-curable resin containing a solid photoinitiator are as follows:

[0056] (1) First, add an appropriate amount of water to a DF-101S heat-collecting magnetic stirrer, place a beaker containing oligomer bisphenol A epoxy acrylate in it, and then preheat to 65°C, and then keep the temperature constant for a period of time until the fluidity of bisphenol A epoxy acrylate is good, and continue to maintain the constant temperature;

[0057] (2) adding diluent tetrahydrofuran acrylate to the bisphenol A epoxy acrylate of step (1), stirring with a JJ-1100W Bona Technology electric stirrer, mixing evenly, to obtain a mixture 1; wherein the stirring speed is 1500 rpm, and the stirring time is 5 min;

[0058] (3) adding a solid photoinitiator 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone to the mixture of step (2), stirring with a JJ-1100W Bona Technology electric stirrer, mixing evenly, to obtain a mixture 2; wherein the stirring speed is 1500 rpm, and the stirring time is 5 min;

[0059] (4) The mixture 2 obtained in step (3) is placed in a LFDS630 digital display 220V vacuum negative pressure pump and the lid is closed. Then, the valves on both sides are tightened, the pressure is reduced to -100 psi, and finally, the pressure is kept constant for 8 minutes until the bubbles are completely eliminated to obtain a resin mixture that is substantially free of bubbles and is uniformly mixed, i.e., a clean and environmentally friendly UV-curable resin containing a solid photoinitiator.

[0060] (5) The resin mixture obtained in step (4) which is substantially free of bubbles and is uniformly mixed is placed under an ultraviolet lamp for irradiation curing. After curing is completed, the sample is taken out of the mold to obtain a clean and environmentally friendly ultraviolet light-curing resin.

[0061] Example 3

[0062] A clean and environment-friendly ultraviolet light-curing resin containing a solid photoinitiator comprises the following raw materials by weight: 90 parts of bisphenol A epoxy acrylate, 10 parts of tetrahydrofuran acrylate and 4 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

[0063] The preparation steps of the clean and environmentally friendly UV-curable resin containing a solid photoinitiator are as follows:

[0064] (1) First, add an appropriate amount of water to a DF-101S heat-collecting magnetic stirrer, place a beaker containing oligomer bisphenol A epoxy acrylate in it, and then preheat to 65°C, and then keep the temperature constant for a period of time until the fluidity of bisphenol A epoxy acrylate is good, and continue to maintain the constant temperature;

[0065] (2) adding diluent tetrahydrofuran acrylate to the bisphenol A epoxy acrylate of step (1), stirring with a JJ-1100W Bona Technology electric stirrer, mixing evenly, to obtain a mixture 1; wherein the stirring speed is 1500 rpm, and the stirring time is 5 min;

[0066] (3) adding a solid photoinitiator 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone to the mixture of step (2), stirring with a JJ-1100W Bona Technology electric stirrer, mixing evenly, to obtain a mixture 2; wherein the stirring speed is 1500 rpm, and the stirring time is 5 min;

[0067] (4) The mixture 2 obtained in step (3) is placed in a LFDS630 digital display 220V vacuum negative pressure pump and the lid is closed. Then, the valves on both sides are tightened, the pressure is reduced to -100 psi, and finally, the pressure is kept constant for 8 minutes until the bubbles are completely eliminated to obtain a resin mixture that is substantially free of bubbles and is uniformly mixed, i.e., a clean and environmentally friendly UV-curable resin containing a solid photoinitiator.

[0068] Comparative Example 1

[0069] Same as Example 1, except that tetrahydrofuran acrylate is replaced by an equal mass of bisethoxy acrylate.

[0070] Comparative Example 2

[0071] The same as Example 1, except that tetrahydrofuran acrylate is replaced by an equal mass of 1,6-hexanediol diacrylate.

[0072] Comparative Example 3

[0073] Same as Example 1, except that tetrahydrofuran acrylate is replaced by an equal mass of dipentaerythritol hexaacrylate.

[0074] Test Example 1

[0075] At a temperature of 25-30°C, the clean and environmentally friendly UV-curable resin containing solid photoinitiator prepared in Examples 1-3 was poured into a prefabricated mold of 250 mm × 250 mm × 3 mm, and then placed at a distance of 20 cm from a UV lamp for UV irradiation. The power of the UV lamp was 50 mW / cm 2 The UV irradiation time was 8 minutes. During the curing process, no ethylene release was detected by an ethylene detector. After the curing was completed, the sample was taken out of the mold to obtain a clean and environmentally friendly UV-curable resin cured sample (the curing process is as follows Figure 1 The obtained cured samples all had smooth surfaces, no cracks and bubbles. The mechanical properties of the samples were tested (referring to standard GB / T 2570-1995), and the results are shown in Table 1:

[0076] Table 1

[0077]

[0078] It can be seen from the data in Table 1 that the cured sample of the clean and environmentally friendly UV-curable resin prepared in Example 2 has better performance in terms of bending strength, tensile strength, elongation at break and Barcol hardness than those in Examples 1 and 3.

[0079] Test Example 2

[0080] Using the clean and environmentally friendly UV-curable resin prepared in Example 2 as a raw material, a 10 cm × 10 cm × 3 mm quality inspection test piece was prepared in accordance with the standard "Specification for Hygiene and Safety Evaluation of Drinking Water Transmission and Distribution Equipment and Protective Materials GB 17219-2001". After soaking it in water for 30 days, the water after soaking was tested according to the national standard GB 5749-2022. The test results are in line with the national standard GB 5749-2022, indicating that the clean and environmentally friendly UV-curable resin of the present invention can be used for trenchless in-situ curing and repair of water supply pipes. Some test indicators are shown in Table 2.

[0081] Table 2

[0082]

[0083]

[0084] Test Example 3

[0085] At a temperature of 25-30°C, the clean and environmentally friendly UV-curable resin containing solid photoinitiator prepared in Comparative Examples 1-3 was poured into a prefabricated mold of 250 mm × 250 mm × 3 mm, and then placed at a distance of 20 cm from the UV lamp for UV irradiation. The power of the UV lamp was 50 mW / cm2 , the UV irradiation time is 8min. After curing, the sample is taken out from the mold to obtain a clean and environmentally friendly UV-curable resin cured sample. The obtained cured samples all have a small amount of cracks and bubbles. The mechanical properties of the sample are tested (refer to standard GB / T 2570-1995) and compared with Example 1. The results are shown in Table 3:

[0086] Table 3

[0087]

[0088]

[0089] It can be seen from the data in Table 3 that the mechanical properties of the cured samples of the clean and environmentally friendly UV-curable resins prepared in Comparative Examples 1-3 are significantly reduced compared to those in Example 1.

[0090] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A clean and environmentally friendly UV-curable resin containing a solid photoinitiator, characterized in that: The raw materials include, by weight: 70-90 parts of bisphenol A epoxy acrylate, 10-30 parts of tetrahydrofuran acrylate, and 2-4 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

2. The clean and environmentally friendly UV-curable resin containing a solid photoinitiator according to claim 1, characterized in that: The raw materials include, by weight: 80 parts of bisphenol A epoxy acrylate, 20 parts of tetrahydrofuran acrylate, and 3 parts of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

3. The method for preparing a clean and environmentally friendly UV-curable resin containing a solid photoinitiator according to any one of claims 1 to 2, characterized in that: The following steps are involved: Tetrahydrofuran acrylate and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone are added to bisphenol A epoxy acrylate in sequence under continuous heating, mixed evenly, and bubbles are removed to obtain the clean and environmentally friendly ultraviolet light-curing resin containing a solid photoinitiator.

4. The method for preparing a clean and environmentally friendly UV-curable resin containing a solid photoinitiator according to claim 3, characterized in that: After adding tetrahydrofuran acrylate, stir for 3 to 5 minutes; after adding 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, stir for 3 to 5 minutes.

5. The method for preparing a clean and environmentally friendly UV-curable resin containing a solid photoinitiator according to claim 3, characterized in that: The heating temperature is 60-65°C.

6. The method for preparing a clean and environmentally friendly UV-curable resin containing a solid photoinitiator according to claim 4, characterized in that: The stirring speed is 1000-2000 rpm.

7. The method for preparing a clean and environmentally friendly UV-curable resin containing a solid photoinitiator according to claim 3, characterized in that: The specific operation of removing bubbles is: extracting bubbles under vacuum negative pressure for 5 to 10 minutes.

8. Use of the clean and environmentally friendly UV-curable resin containing a solid photoinitiator as claimed in any one of claims 1 to 2 in UV-curing in-situ repair of water supply pipelines.

9. The use according to claim 8, characterized in that The specific operation of the UV-curing in-situ repair of the water supply pipeline is: coating or pouring the clean and environmentally friendly UV-curing resin containing the solid photoinitiator on the part of the water supply pipeline to be repaired, and curing it under the irradiation of UV light.

10. The use according to claim 9, characterized in that The power of the UV lamp is 50mW / cm 2 The irradiation time is 8 to 10 minutes.

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