A trenchless composite inner liner pipe resistant to chemical corrosion

Abstract

This utility model discloses a trenchless composite liner pipe with chemical corrosion resistance, comprising a chemical corrosion resistant inner layer, an outer surface of which is provided with a reinforcing structural layer, an outer surface of which is provided with an elastic buffer layer, an outer surface of which is provided with an adhesive transition layer, and a connector fixedly connected to the side surface of the chemical corrosion resistant inner layer. A sealing ring is provided on the inner surface of the connector. Through the dual protection of hindered phenolic antioxidants and benzotriazole ultraviolet absorbers in the chemical corrosion resistant inner layer, it can not only effectively resist the erosion of the inner layer by corrosive media such as acids, alkalis, and solvents, preventing material oxidation and degradation, but also block aging and cracking problems caused by ultraviolet radiation, ensuring that the inner layer maintains its structural integrity for a long time. This fundamentally reduces the frequency of pipeline maintenance and replacement due to corrosion damage, and significantly extends the overall service life of the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of chemical corrosion resistance technology, and in particular to a non-excavation composite lining pipe with chemical corrosion resistance. Background Technology

[0002] In fields such as industrial media transportation, municipal sewage treatment, and chemical raw material transmission, pipelines, as the core transportation carriers, have long faced performance challenges brought about by complex operating conditions. Among these challenges, media corrosion and environmental aging are the main problems leading to pipeline failure and are also key pain points that urgently need to be optimized in the industry. Traditional pipelines often employ single anti-corrosion materials or simple composite structures. While they can withstand mild corrosive media in the short term, they still have significant drawbacks when transporting highly corrosive media such as acidic and alkaline solutions and organic solvents over long periods. Oxidizing substances in the media continuously react chemically with the pipeline's inner wall material, causing the material's molecular chains to break and its structure to loosen, leading to internal wall corrosion and perforation. This not only causes media leakage and environmental pollution but also requires frequent shutdowns for maintenance and replacement, significantly increasing operation and maintenance costs. Some pipelines are laid in open environments or shallow soil, where ultraviolet rays can penetrate the pipeline surface or seep into the inner wall through joint gaps, causing material aging and resulting in cracks and embrittlement of the inner wall. Especially in trenchless construction scenarios, pipelines need to withstand tensile and bending forces. The reduced toughness of the aged material makes it extremely prone to breakage during construction, further reducing the pipeline's service life. Utility Model Content

[0003] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide a non-excavation composite liner pipe that is resistant to chemical corrosion. This solves the problem that oxidizing substances in the medium will continuously react chemically with the pipe inner wall material, causing the material molecular chain to break, the structure to become loose, and the inner wall to corrode and perforate, which not only causes medium leakage and environmental pollution, but also requires frequent shutdowns for maintenance and replacement.

[0004] This utility model also provides a trenchless composite liner pipe with the above-mentioned chemical corrosion resistant properties. The chemical corrosion resistant inner layer has dual protection from hindered phenolic antioxidants and benzotriazole ultraviolet absorbers. It can not only effectively resist the erosion of the inner layer by corrosive media such as acids, alkalis and solvents and prevent material oxidation and degradation, but also block the aging and cracking problems caused by ultraviolet rays, ensuring that the inner layer maintains its structural integrity for a long time. This fundamentally reduces the frequency of maintenance and replacement of pipelines due to corrosion damage and significantly extends the overall service life of the pipeline.

[0005] This technical solution provides a trenchless composite liner pipe with chemical corrosion resistance. It comprises: a chemical corrosion-resistant inner layer; a reinforcing structural layer on the outer surface of the inner layer; an elastic buffer layer on the outer surface of the reinforcing structural layer; an adhesive transition layer on the outer surface of the elastic buffer layer; a connector fixedly connected to the side surface of the inner layer; and a sealing ring on the inner surface of the connector. Through the dual protection of hindered phenolic antioxidants and benzotriazole UV absorbers in the chemical corrosion-resistant inner layer, it effectively resists the erosion of the inner layer by corrosive media such as acids, alkalis, and solvents, preventing material oxidation and degradation. It also blocks aging and cracking caused by ultraviolet radiation, ensuring the inner layer maintains its structural integrity over a long period. This fundamentally reduces the frequency of pipeline maintenance and replacement due to corrosion damage, significantly extending the overall service life of the pipeline.

[0006] According to the present invention, a non-excavation composite liner pipe with chemical corrosion resistance is provided, wherein the chemical corrosion resistant inner layer contains an antioxidant and an ultraviolet absorber, wherein the antioxidant is a hindered phenolic antioxidant and the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0007] According to the present invention, a non-excavation composite liner pipe resistant to chemical corrosion is provided, wherein nano-silica particles are added to the reinforcing structural layer, and the nano-silica particles are surface modified by a silane coupling agent.

[0008] According to the present invention, a non-excavation composite liner pipe resistant to chemical corrosion has a plurality of uniformly distributed protrusions on the inner surface of the elastic buffer layer.

[0009] According to the present invention, a non-excavation composite liner pipe resistant to chemical corrosion is provided, wherein the bonding transition layer is made of modified epoxy resin.

[0010] According to the present invention, a non-excavation composite liner pipe resistant to chemical corrosion is provided, wherein the connector is made of stainless steel.

[0011] According to the present invention, a non-excavation composite liner pipe resistant to chemical corrosion is provided, wherein the sealing ring is made of fluororubber.

[0012] Beneficial effects: The dual protection of hindered phenolic antioxidants and benzotriazole UV absorbers in the chemical corrosion resistant inner layer not only effectively resists the erosion of the inner layer by corrosive media such as acids, alkalis, and solvents, preventing material oxidation and degradation, but also blocks the aging and cracking problems caused by ultraviolet rays, ensuring that the inner layer maintains its structural integrity for a long time. This fundamentally reduces the frequency of maintenance and replacement of pipelines due to corrosion damage, and significantly extends the overall service life of the pipeline. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a front view of the trenchless composite liner pipe with chemical corrosion resistance of this utility model. Figure 2 This is a bottom view of the trenchless composite liner pipe with chemical corrosion resistance of this utility model. Figure 3 This is a rear view of the trenchless composite liner pipe with chemical corrosion resistance according to this utility model. Figure 4 This is a front view of the trenchless composite liner pipe with chemical corrosion resistance according to this utility model. Legend: 1. Chemical corrosion resistant inner layer; 2. Reinforcing structural layer; 3. Elastic buffer layer; 4. Adhesive transition layer; 5. Connector; 6. Sealing ring. Detailed Implementation

[0014] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0015] Reference Figure 1-4 This utility model discloses a trenchless composite liner pipe resistant to chemical corrosion, comprising: a chemical corrosion resistant inner layer 1, wherein an antioxidant and an ultraviolet absorber are added to the chemical corrosion resistant inner layer 1, the antioxidant being a hindered phenolic antioxidant and the ultraviolet absorber being a benzotriazole ultraviolet absorber; a reinforcing structural layer 2 is provided on the outer surface of the chemical corrosion resistant inner layer 1, wherein nano-silica particles are added to the reinforcing structural layer 2, the nano-silica particles being surface modified by a silane coupling agent; an elastic buffer layer 3 is provided on the outer surface of the reinforcing structural layer 2, wherein a plurality of uniformly distributed protrusion structures are provided on the inner surface of the elastic buffer layer 3; an adhesive transition layer 4 is provided on the outer surface of the elastic buffer layer 3, the adhesive transition layer 4 being made of modified epoxy resin; a connector 5 is fixedly connected to the side surface of the chemical corrosion resistant inner layer 1, the connector 5 being made of stainless steel, and a sealing ring 6 being provided on the inner surface of the connector 5, the sealing ring 6 being made of fluororubber.

[0016] Specifically: The chemically resistant inner layer 1, as the core layer in direct contact with the transported medium, incorporates hindered phenolic antioxidants to inhibit the oxidative degradation of the inner layer material by oxidizing substances in the medium. Benzotriazole UV absorbers absorb UV rays that may penetrate the environment, preventing aging and cracking of the inner layer due to UV radiation. This dual protection ensures the inner layer maintains structural integrity in corrosive media such as acids, alkalis, and solvents, preventing erosion of the pipeline body. The reinforced structural layer 2 provides support for the pipeline based on the strength of the substrate itself. Simultaneously, nano-silica particles modified with a silane coupling agent are uniformly dispersed within the layer through the modified interfacial bonding force, significantly improving the tensile and impact resistance of the structural layer. This allows it to withstand the external forces generated by pipeline pulling and squeezing during trenchless construction, as well as the pressure load of the transported medium, preventing deformation or rupture due to insufficient structural strength. Furthermore, the modified nanoparticles fill tiny gaps within the structural layer, further enhancing overall sealing. The elastic buffer layer 3 mitigates external impacts and vibrations through its own elastic properties. When the pipeline encounters soil settlement or external construction disturbances, the elastic material can absorb the impact energy. At the same time, the evenly distributed protrusions on its inner side can form an "elastic support interval," reducing the rigid friction between the reinforcing structure layer and the buffer layer and avoiding interlayer delamination caused by long-term vibration. The modified epoxy resin bonding transition layer 4 on the outside of the buffer layer can tightly bond with the outer substrate of the pipeline through the high adhesion of epoxy resin, forming a "sealed transition interface" to prevent external moisture and soil impurities from seeping into the interlayer and enhance the overall pipeline's resistance to displacement. The stainless steel connector 5, with its high strength and deformation resistance, enables reliable splicing of multiple inner lining pipes. The fluororubber sealing ring 6 on its inner side utilizes the excellent chemical resistance and elasticity of fluororubber to form a tight sealing structure at the connection point.

[0017] Working Principle: The chemically resistant inner layer 1, as the core layer in direct contact with the transported medium, incorporates hindered phenolic antioxidants to inhibit the oxidative degradation of the inner layer material by oxidizing substances in the medium. Benzotriazole UV absorbers absorb any UV rays that may penetrate the environment, preventing aging and cracking of the inner layer due to UV radiation. This dual protection ensures the inner layer maintains its structural integrity in corrosive media such as acids, alkalis, and solvents, preventing erosion of the pipeline body. The reinforced structural layer 2 provides support for the pipeline based on the strength of the substrate itself. Simultaneously, nano-silica particles modified with a silane coupling agent are uniformly dispersed within the layer through the modified interfacial bonding force, significantly improving the tensile and impact resistance of the structural layer. This allows it to withstand the external forces generated by pipeline pulling and squeezing during trenchless construction, as well as the pressure load of the transported medium, preventing deformation or rupture due to insufficient structural strength. Furthermore, the modified nanoparticles fill tiny gaps within the structural layer, further enhancing overall sealing. The elastic buffer layer 3 mitigates external impacts and vibrations through its own elastic properties. When the pipeline encounters soil settlement or external construction disturbances, the elastic material can absorb the impact energy. At the same time, the evenly distributed convex structure on its inner side can form an "elastic support interval," reducing rigid friction between the reinforcing structure layer and the buffer layer and avoiding interlayer delamination caused by long-term vibration. The modified epoxy resin bonding transition layer 4 on the outside of the buffer layer can tightly bond with the outer substrate of the pipeline through the high adhesion of epoxy resin, forming a "sealed transition interface" to prevent external moisture and soil impurities from seeping into the interlayer, while enhancing the overall pipeline's resistance to displacement. The stainless steel connector 5, with its high strength and deformation resistance, enables reliable splicing of multiple inner lining pipes. The fluororubber sealing ring 6 on its inner side utilizes the excellent chemical resistance and elasticity of fluororubber to form a tight sealing structure at the connection point, preventing the transported medium from leaking from the interface. At the same time, the temperature resistance and aging resistance of fluororubber can ensure long-term stable sealing performance, adapting to the media transport requirements under different working conditions.

[0018] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A trenchless composite liner pipe resistant to chemical corrosion, characterized in that, include: The inner layer (1) is resistant to chemical corrosion. The outer surface of the inner layer (1) is provided with a reinforcing structure layer (2). The outer surface of the reinforcing structure layer (2) is provided with an elastic buffer layer (3). The outer surface of the elastic buffer layer (3) is provided with an adhesive transition layer (4). The side surface of the inner layer (1) is fixedly connected with a connector (5). The inner surface of the connector (5) is provided with a sealing ring (6).

2. The chemically resistant trenchless composite liner pipe according to claim 1, characterized in that, The chemical corrosion resistant inner layer (1) contains an antioxidant and an ultraviolet absorber, wherein the antioxidant is a hindered phenolic antioxidant and the ultraviolet absorber is a benzotriazole ultraviolet absorber.

3. The chemically resistant trenchless composite liner pipe according to claim 1, characterized in that, The reinforced structural layer (2) also contains nano-silica particles, which are surface-modified by a silane coupling agent.

4. The non-excavation composite liner pipe resistant to chemical corrosion according to claim 1, characterized in that, The inner surface of the elastic buffer layer (3) is provided with a number of uniformly distributed protrusion structures.

5. The trenchless composite liner pipe resistant to chemical corrosion according to claim 1, characterized in that, The adhesive transition layer (4) is made of modified epoxy resin.

6. The trenchless composite liner pipe resistant to chemical corrosion according to claim 1, characterized in that, The connector (5) is made of stainless steel.

7. The chemically resistant trenchless composite liner pipe according to claim 1, characterized in that, The sealing ring (6) is made of fluororubber.

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