Resin material for trenchless pipeline repair as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of functional polymer material preparation, and particularly relates to a resin material for trenchless pipeline repair and a preparation method and application thereof. The resin material comprises the following components in parts by weight: 50-80 parts of unsaturated polyester resin, 20-50 parts of epoxy resin, 1-5 parts of a photoinitiator, 1-5 parts of a curing agent and 1-5 parts of a compatilizer. The resin material utilizes heat released by unsaturated polyester resin in the photocuring process to drive epoxy resin to be cured, so that the problems of low curing degree and the like caused by insufficient ultraviolet light penetrating power of deep resin are solved, and the resin material has a good application prospect in the field of trenchless repair of pipelines.

Description

Technical Field

[0001] This invention belongs to the field of functional polymer material preparation technology, specifically relating to a resin material for trenchless pipeline repair, its preparation method, and its application. Background Technology

[0002] With the increasing prominence of aging urban underground pipe networks, UV-CIPP (ultraviolet-in-situ curing repair) technology is gradually becoming a mainstream solution due to its advantages such as fast construction, low cost, and minimal environmental impact. This technology uses ultraviolet light to cure resin-impregnated fiberglass hoses, forming a high-strength inner lining layer inside the old pipes, thus completing the pipe repair. However, currently, UV-CIPP technology still faces two major technical bottlenecks in terms of material performance and construction adaptability, hindering its further promotion.

[0003] First, the resin's corrosion resistance is insufficient. Currently, UV-CIPP mainly uses unsaturated polyester resin (UPR) as the resin matrix. Although UPR is low in cost and cures quickly, it is prone to swelling and hydrolysis in environments with high acidity, alkali, high salt, or organic solvents, leading to lining failure and making it unsuitable for harsh environments such as industrial wastewater pipelines. Second, the penetration ability of ultraviolet light is limited. When repairing thick-walled pipes (>15mm), problems such as insufficient deep curing and excessively long curing time easily occur, seriously affecting the repair quality and construction efficiency.

[0004] Therefore, developing a trenchless repair resin material with high curing efficiency, excellent corrosion resistance, and strong adaptability is of great significance for expanding the application fields of UV-CIPP technology and promoting the efficient development of the pipeline repair industry. Summary of the Invention

[0005] The purpose of this invention is to provide a resin material for trenchless pipeline repair, its preparation method and application. Compared with existing trenchless repair resins, this resin material has advantages such as high curing efficiency, excellent corrosion resistance and high mechanical strength, effectively overcoming the shortcomings of the prior art.

[0006] Specifically, the present invention provides the following technical solutions: A resin material for trenchless pipeline repair, comprising, by weight, the following components: 50-80 parts unsaturated polyester resin, 20-50 parts epoxy resin, 1-5 parts photoinitiator, 1-5 parts curing agent, and 1-5 parts compatibilizer.

[0007] Preferably, the unsaturated polyester resin is an isophthalic acid-neopentyl glycol type unsaturated polyester resin. The advantage of isophthalic acid-neopentyl glycol type unsaturated polyester resin compared to ordinary isophthalic acid type unsaturated polyester resin is that neopentyl glycol is a diol with two methyl side chains. This structure exhibits superior hydrolysis and chemical corrosion resistance compared to ordinary diols, significantly improving the long-term durability of repaired pipelines and extending their service life in trenchless repair applications.

[0008] Preferably, the epoxy resin is a glycidyl ether type epoxy resin.

[0009] Preferably, the photoinitiator is one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), 1-hydroxycyclohexylphenyl ketone (184), 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO), and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (819).

[0010] Preferably, the curing agent is one or more of dicyandiamide, boron trifluoride monoethylamine, and 4,4'-diaminodiphenyl sulfone. By adding the above-mentioned medium-temperature latent curing agent, this invention ensures the storage stability of the resin at room temperature and utilizes the exothermic reaction of UPR photocuring (approximately 80-100°C) to achieve rapid EP curing, thereby solving the problem of insufficient deep resin curing and eliminating the need for additional energy supply during construction.

[0011] Preferably, the compatibilizer is one or more selected from glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, and vinyl benzyl glycidyl ether. By adding the above-mentioned compatibilizer, the present invention can reduce the interfacial energy between the EP and UPR phases, thereby suppressing phase separation and making the blend more uniform.

[0012] The present invention also provides a method for preparing the above-mentioned resin material, comprising the following steps: (1) Mix the compatibilizer and epoxy resin evenly, heat to 70~90℃, add unsaturated polyester resin and mix evenly; (2) Cool the mixture obtained in step (1) to room temperature, then add photoinitiator and curing agent and mix evenly to obtain a resin material for trenchless pipeline repair (store away from light).

[0013] The present invention also provides an application of the above-mentioned resin material in trenchless pipeline repair, wherein a glass fiber hose impregnated with the resin material is placed into the pipeline to be repaired, and ultraviolet light is applied to achieve pipeline repair.

[0014] The beneficial effects of this invention are at least as follows: (1) The present invention provides a resin material for trenchless pipeline repair, which uses epoxy resin and unsaturated polyester resin as resin matrix material. Compared with pure unsaturated polyester resin, it can significantly improve corrosion resistance and mechanical strength, thereby expanding the application field of UV-CIPP repair technology. (2) The resin material for trenchless pipeline repair provided by the present invention utilizes the heat released by the unsaturated polyester resin during the photocuring process to drive the epoxy resin to cure, thereby solving the problem of low curing degree caused by insufficient ultraviolet light penetration of deep resin, and no additional energy supply is required. (3) The resin material provided by the present invention for trenchless pipeline repair improves construction efficiency and repair quality without changing the storage stability and construction performance of the original pure unsaturated polyester resin system. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art, or in accordance with the product manual.

[0016] Example 1 A resin material for trenchless pipeline repair comprises the following components by weight: 80 parts unsaturated polyester resin, 20 parts epoxy resin, 1.5 parts photoinitiator, 1 part curing agent, and 5 parts compatibilizer; wherein, The unsaturated polyester resin is an isophthalic-neopentyl glycol type unsaturated polyester resin, which is obtained by polycondensation of isophthalic acid and neopentyl glycol.

[0017] The epoxy resin is a bisphenol A type glycidyl ether type epoxy resin, manufactured by Nan Ya Plastics, and its brand name is 128.

[0018] The photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO).

[0019] The curing agent is boron trifluoride monoethylamine.

[0020] The compatibilizer is glycidyl methacrylate.

[0021] The preparation method of this resin material is as follows: (1) Add the compatibilizer to the epoxy resin, stir thoroughly, heat to 80°C, add the unsaturated polyester resin and stir evenly. (2) Cool the above mixture to 25°C, then add photoinitiator and curing agent and stir thoroughly. After stirring evenly, store in the dark to obtain the final product.

[0022] Performance testing: (1) Curing depth test: A 1kw ultraviolet lamp was used to irradiate the material from 0.5m directly above it for 5 minutes. The curing depth of the material was recorded after the irradiation was completed. (2) Mechanical property testing: The tensile and flexural properties of the cured material were tested in accordance with GB / T 2567-2021 "Test Methods for Properties of Resin Castings"; (3) Corrosion resistance test: The prepared bending performance test strips were placed in 5wt% H2SO4 solution and 0.5wt% NaOH solution respectively, and soaked at room temperature for 7 days. After soaking, the strips were observed to see if cracks or stickiness appeared. At the same time, their bending performance was tested and the bending modulus retention rate was calculated. (4) Storage stability test: Store the material at room temperature and in the dark, and observe whether it solidifies every day.

[0023] Comparative Example 1 The only difference from Example 1 is that the curing agent is 4,4-diaminodiphenylmethane.

[0024] Comparative Example 2 A resin material for trenchless pipeline repair comprises the following components by weight: 100 parts unsaturated polyester resin, 2 parts photoinitiator, wherein... The unsaturated polyester resin is an isophthalic-neopentyl glycol type unsaturated polyester resin, which is obtained by polycondensation of isophthalic acid and neopentyl glycol.

[0025] The photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO).

[0026] The performance test results of the above embodiments and comparative examples are shown in Table 1 below: Table 1

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A resin material for trenchless pipeline repair, characterized in that, By weight, it comprises the following components: 50-80 parts unsaturated polyester resin, 20-50 parts epoxy resin, 1-5 parts photoinitiator, 1-5 parts curing agent, and 1-5 parts compatibilizer.

2. The resin material for trenchless pipeline repair according to claim 1, characterized in that, The unsaturated polyester resin is an isophenylene-neopentyl glycol type unsaturated polyester resin.

3. A resin material for trenchless pipeline repair according to claim 1 or 2, characterized in that, The epoxy resin is a glycidyl ether type epoxy resin.

4. A resin material for trenchless pipeline repair according to claim 1 or 2, characterized in that, The photoinitiator is one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

5. A resin material for trenchless pipeline repair according to claim 1 or 2, characterized in that, The curing agent is one or more of dicyandiamide, boron trifluoride monoethylamine, and 4,4'-diaminodiphenyl sulfone.

6. A resin material for trenchless pipeline repair according to claim 1 or 2, characterized in that, The compatibilizer is one or more of glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, and vinyl benzyl glycidyl ether.

7. The method for preparing the resin material according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Mix the compatibilizer and epoxy resin evenly, heat to 70~90℃, add unsaturated polyester resin and mix evenly; (2) Cool the mixture obtained in step (1) to room temperature, then add photoinitiator and curing agent and mix evenly to obtain a resin material for trenchless pipeline repair.

8. The application of the resin material according to any one of claims 1-6 in trenchless pipeline repair, characterized in that, A glass fiber tube impregnated with the resin material is placed into the pipe to be repaired, and ultraviolet light is applied to achieve pipe repair.

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