Long-acting anti-scaling composition for tunnel blind pipe and long-acting anti-scaling method

Abstract

The invention discloses a long-acting anti-scaling composition for a tunnel blind pipe and a long-acting anti-scaling method. The long-acting anti-scaling composition comprises a detergent, a film-forming agent and a corrosion inhibitor, the detergent is prepared from 50 to 60 parts by mass of water, 25 to 30 parts by mass of formic acid, 10 to 20 parts by mass of citric acid and 1 to 1.5 parts by mass of a V98 acidic thickening agent; the film-forming agent comprises 3-6 parts by mass of silicon dioxide nanoparticles, 10 parts by mass of a silicon waterproof agent and 15-30 parts by mass of water; the corrosion inhibitor comprises 95 parts by mass of silica gel and 8-10 parts by mass of a 1-hydroxyethylidene-1, 1-diphosphonic acid solution. The problem that an existing tunnel blind pipe crystal cleaning method cannot prevent crystals from being formed again is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and in particular to a long-acting anti-scaling composition for tunnel blind pipes and a long-acting anti-scaling method. Background Art

[0002] Tunnel blind pipes are a type of drainage facility used in tunnel engineering, specially designed to collect and discharge seepage water behind the tunnel structure to prevent water damage and protect the safety of the tunnel structure. According to the Technical Specification for Construction of Longitudinal Drainage Blind Pipes in Highway Tunnels DB61 / T 1425-2021, longitudinal drainage blind pipes are permeable blind pipes arranged along the longitudinal direction of the tunnel on the outside of the bottom of the secondary lining, with permeable holes of a certain aperture. These permeable holes are arranged on the upper half of the pipe body to ensure a certain spacing of water inlet holes (holes), allowing water to flow into the pipe while preventing debris and other debris from entering.

[0003] In railway and highway tunnel projects, minerals carried by groundwater, especially heavy calcium carbonate, will deposit on the inner wall of the blind pipe to form crystals, resulting in poor drainage.

[0004] At present, the main method to solve the blockage of blind pipe crystals is to use high-pressure jets for physical cleaning. Although this method is effective, it requires frequent operations, which is not conducive to the normal progress and long-term maintenance of tunnel projects. In actual projects, there are also chemical methods to clear blind pipe crystals. For example, the mixture of 30% formic acid and 10% citric acid, with an appropriate amount of thickening lubricant, can effectively dissolve the crystallized substances in the blind pipe. These remedial methods cannot fundamentally prevent the re-formation of crystals. Summary of the invention

[0005] In order to overcome the defects of the prior art, a long-term anti-scaling composition and a long-term anti-scaling method for tunnel blind pipes are provided to solve the problem that the existing tunnel blind pipe crystal cleaning method cannot prevent crystals from forming again.

[0006] To achieve the above object, a long-term anti-scaling composition for tunnel blind pipes is provided, comprising a detergent, a film-forming agent and a corrosion inhibitor;

[0007] The detergent comprises 50 to 60 parts by mass of water, 25 to 30 parts by mass of formic acid, 10 to 20 parts by mass of citric acid, and 1 to 1.5 parts by mass of an acidic thickener;

[0008] The film-forming agent comprises 3 to 6 parts by mass of silicon dioxide nanoparticles, 10 parts by mass of silicon waterproofing agent, and 15 to 30 parts by mass of water;

[0009] The corrosion inhibitor comprises 95 parts by mass of silica gel and 8-10 parts by mass of hydroxyethylidene diphosphonic acid solution.

[0010] Furthermore, the average particle size of the silicon dioxide nanoparticles is 7 nm.

[0011] Furthermore, the silicone waterproofing agent is a water-based solvent-free silane or siloxane emulsion.

[0012] The present invention provides a long-term anti-scaling method using a long-term anti-scaling composition for a tunnel blind pipe, comprising the following steps:

[0013] The detergent is prepared by uniformly mixing 50 to 60 parts by weight of water, 25 to 30 parts by weight of formic acid, 10 to 20 parts by weight of citric acid, and 1 to 1.5 parts by weight of an acidic thickener;

[0014] 3 to 6 parts by weight of silicon dioxide nanoparticles, 10 parts by weight of silicon waterproofing agent, and 15 to 30 parts by weight of water are uniformly mixed to prepare a film-forming agent;

[0015] Immersing 95 parts by weight of silica gel in a hydroxyethylidene diphosphonic acid solution, and when the silica gel absorbs 8 to 10 parts by weight of the hydroxyethylidene diphosphonic acid solution, heating, curing, and crushing the silica gel adsorbing the hydroxyethylidene diphosphonic acid solution to obtain a corrosion inhibitor;

[0016] The detergent is injected through one end of the tunnel blind pipe and then discharged from the other end of the tunnel blind pipe to quickly penetrate and decompose the crystals on the wall of the tunnel blind pipe;

[0017] Filling the decomposed and crystallized blind tube with the film-forming agent and then drawing it out to allow the film-forming agent to form a water-based super-hydrophobic film layer on the tube wall;

[0018] The corrosion inhibitor is spread on the aqueous super-hydrophobic film layer to inhibit the formation of crystals on the tube wall.

[0019] Furthermore, after the film-forming agent is extracted, the water-based super-hydrophobic film layer is cured at room temperature for 3 hours.

[0020] The beneficial effect of the present invention is that the long-acting anti-scaling composition for tunnel blind pipes of the present invention is used to solve the problem of poor tunnel drainage caused by blind pipe crystal blockage in tunnel engineering. The long-acting anti-scaling composition for tunnel blind pipes of the present invention is a comprehensive application of a triple agent, which provides a comprehensive and efficient solution to the problem of tunnel blind pipe crystal blockage.

[0021] The scale remover in the long-acting anti-scaling composition for the tunnel blind pipe of the present invention is used as a scale cleaning agent, which can quickly penetrate and decompose the existing crystal deposits in the pipe and restore the blind pipe to be unobstructed.

[0022] The film-forming agent in the long-lasting anti-scaling composition for tunnel blind pipes of the present invention is a pipeline hydrophobic coating, which can form a special protective film. This film has super-hydrophobic properties, so that a thin layer of air exists between the water flow and the pipeline, which can effectively prevent the formation and adhesion of future crystals, thereby maintaining the clean state of the pipeline for a long time.

[0023] The corrosion inhibitor in the long-acting anti-scaling composition for tunnel blind pipes of the present invention is a highly efficient composite scale and corrosion inhibitor, which inhibits the generation of calcium carbonate by chelating calcium and magnesium ions in hard water and acting on carbonate ions, thereby chemically slowing down the generation of crystals.

[0024] The synergistic effect of the scale remover, film former and corrosion inhibitor in the long-term anti-scaling composition for tunnel blind pipes of the present invention provides long-term anti-crystallization protection for the tunnel blind pipes, ensuring the efficient and stable operation of the tunnel drainage system.

[0025] The long-term anti-scaling method of the long-term anti-scaling composition for tunnel blind pipes of the present invention has strong on-site operability, safety and reliability, and strong anti-scaling ability, and is particularly suitable for tunnel projects in high calcium carbonate rock areas where water diversion is difficult, water resources are scarce, and crystallization problems are serious. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below in conjunction with the embodiments.

[0028] The invention provides a long-acting anti-scaling composition for a tunnel blind pipe, comprising a detergent, a film-forming agent and a corrosion inhibitor.

[0029] The detergent comprises 50 to 60 parts by mass of water, 25 to 30 parts by mass of formic acid, 10 to 20 parts by mass of citric acid, and 1 to 1.5 parts by mass of an acidic thickener.

[0030] As a cleaning scale agent, the detergent can quickly penetrate and decompose the existing crystalline deposits in the pipe, quickly restore the smooth flow of the blind pipe, respond quickly to emergency situations, ensure the cleanliness of the pipe, and facilitate the adhesion of the paint.

[0031] The film-forming agent comprises 3-6 parts by weight of silicon dioxide nanoparticles, 10 parts by weight of silicon waterproofing agent, and 15-30 parts by weight of water.

[0032] Among them, the average particle size of the silicon dioxide nanoparticles is 7nm.

[0033] The silicone waterproofing agent is a water-based solvent-free silane or siloxane emulsion. In this embodiment, the silicone waterproofing agent is Wacker brand silane BS 4004.

[0034] The film former adopts an extremely simple and cost-effective coating production method. After dipping, it can adhere to the plastic surface to form a water-based super-hydrophobic coating (free from dissolving or swelling blind pipe material: PVC / HDPE). This pipeline hydrophobic coating can form a protective layer inside the pipe, which can inhibit the nucleation of scale and reduce the adhesion of scale, thereby effectively preventing the adhesion and blockage of future crystals.

[0035] The corrosion inhibitor comprises 95 parts by mass of silica gel and 8-10 parts by mass of hydroxyethylidene diphosphonic acid solution.

[0036] The corrosion inhibitor interferes with the crystallization process through chemical action. Long-term use under weak flow erosion can sustainably inhibit the formation of crystals, ensuring the long-term stable operation of the tunnel blind pipe.

[0037] The present invention provides a long-term anti-scaling method using a long-term anti-scaling composition for a tunnel blind pipe, comprising the following steps:

[0038] S1. Evenly mix 50-60 parts by weight of water, 25-30 parts by weight of formic acid, 10-20 parts by weight of citric acid, and 1-1.5 parts by weight of V98 acidic thickener to prepare a detergent.

[0039] Specifically, 50 to 60 parts by mass of water, 25 to 30 parts by mass of formic acid, 10 to 20 parts by mass of citric acid, and 1 to 1.5 parts by mass of V98 acidic thickener are prepared according to the mass parts, water is added and stirred for 10 minutes, and the mixture is cooled to room temperature to complete the preparation of the detergent.

[0040] S2. 3 to 6 parts by mass of silicon dioxide nanoparticles, 10 parts by mass of silicon waterproofing agent, and 15 to 30 parts by mass of water are mixed uniformly to prepare a film-forming agent.

[0041] Specifically, 3 to 6 parts by mass of silicon dioxide nanoparticles (average diameter ~7 nm), 10 parts by mass of Wacker silane BS 4004, 15 to 30 parts by weight of water are stirred for 20 minutes to complete the preparation of the film-forming agent.

[0042] The silicon dioxide nanoparticles and silane are mixed in the form of aqueous solution / hydrosol, and the formula should be determined by weight after deducting the water contained.

[0043] S3. Soak 95 parts by weight of silica gel in a hydroxyethylidene diphosphonic acid solution. When the silica gel absorbs 8 to 10 parts by weight of the hydroxyethylidene diphosphonic acid solution, heat, solidify and crush the silica gel adsorbed with the hydroxyethylidene diphosphonic acid solution to obtain a corrosion inhibitor.

[0044] Specifically, 95 parts by mass of silica gel is soaked in a 60% hydroxyethylidene diphosphonic acid solution, and the silica gel is taken out and weighed every 5 minutes. When the adsorption amount of the solution is 8 to 10 parts by mass, the soaking and absorption of liquid is stopped. The silica gel mixture containing HEDP is heated to 105°C in a blast drying oven and solidified for 24 hours. The solidified silica gel is then crushed and sieved into particles less than 1 mm, i.e., the corrosion inhibitor.

[0045] S4. Inject the detergent through one end of the tunnel blind pipe and discharge it from the other end of the tunnel blind pipe to quickly penetrate and decompose the crystals on the wall of the tunnel blind pipe.

[0046] Inject the detergent into the blocked blind tube, inject at one end of the blind tube and discharge freely at the other end. Observe the changes of the blind tube at the injection and discharge ends. After flushing, the visible part of the blind tube wall is obviously smooth, and the outflowing liquid is clear without white scale.

[0047] Since the drainage blind pipe wall has small seepage holes, when the dissolved liquid is injected under pressure, a small amount of solution may flow into the middle of the primary branch and the secondary lining through the seepage holes. The time should be controlled to reduce solution loss.

[0048] S5, filling the blind tube after decomposition and crystallization with the film-forming agent and drawing it out to allow the film-forming agent to form a water-based super-hydrophobic film layer on the tube wall.

[0049] After the film-forming agent was extracted, the water-based super-hydrophobic film layer was cured at room temperature for 3 hours.

[0050] Inject the film-forming agent into one end of the blind pipe until it is full. Then extract the film-forming agent for recycling. Allow to stand at room temperature for 3 hours to cure.

[0051] S6. Spreading a corrosion inhibitor on the aqueous super-hydrophobic film layer to inhibit crystal formation on the tube wall.

[0052] Specifically, take a proper amount of corrosion inhibitor, use a blower to blow it into the reserved opening of the blind pipe and spread it on the water-based super-hydrophobic film layer.

[0053] The long-acting anti-scaling composition for tunnel blind pipes of the present invention is used to solve the problem of poor tunnel drainage caused by blind pipe crystal blockage in tunnel engineering. The long-acting anti-scaling composition for tunnel blind pipes of the present invention is a comprehensive application of a triple agent, which provides a comprehensive and efficient solution to the problem of tunnel blind pipe crystal blockage.

[0054] The scale remover in the long-acting anti-scaling composition for the tunnel blind pipe of the present invention is used as a scale cleaning agent, which can quickly penetrate and decompose the existing crystal deposits in the pipe and restore the blind pipe to be unobstructed.

[0055] The film-forming agent in the long-lasting anti-scaling composition for tunnel blind pipes of the present invention is a pipeline hydrophobic coating, which can form a special protective film. This film has super-hydrophobic properties, so that a thin layer of air exists between the water flow and the pipeline, which can effectively prevent the formation and adhesion of future crystals, thereby maintaining the clean state of the pipeline for a long time.

[0056] The corrosion inhibitor in the long-acting anti-scaling composition for tunnel blind pipes of the present invention is a highly efficient composite scale and corrosion inhibitor, which inhibits the generation of calcium carbonate by chelating calcium and magnesium ions in hard water and acting on carbonate ions, thereby chemically slowing down the generation of crystals.

[0057] The synergistic effect of the scale remover, film former and corrosion inhibitor in the long-term anti-scaling composition for tunnel blind pipes of the present invention provides long-term anti-crystallization protection for the tunnel blind pipes, ensuring the efficient and stable operation of the tunnel drainage system.

[0058] The long-term anti-scaling method of the long-term anti-scaling composition for tunnel blind pipes of the present invention has strong on-site operability, safety and reliability, and strong anti-scaling ability, and is particularly suitable for tunnel projects in high calcium carbonate rock areas where water diversion is difficult, water resources are scarce, and crystallization problems are serious.

[0059] The long-acting anti-scaling composition for tunnel blind pipes of the present invention not only takes into account the need for immediate cleaning of scale, but also provides a measure for long-term protection.

[0060] The long-acting anti-scaling composition for tunnel blind pipes of the present invention is easy to put in, and provides users with a long-acting means for continuously preventing crystallization.

[0061] The long-acting anti-scaling composition for tunnel blind pipes of the present invention is made of environmentally friendly materials, which will reduce the impact on the environment and meet the current requirements of green construction and sustainable development.

[0062] The long-acting anti-scaling composition for tunnel blind pipes of the present invention reduces the cost of frequent cleaning and repair through prevention and long-term maintenance, improves construction efficiency in the short term, and has better economic benefits in the long run.

[0063] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A long-lasting anti-scaling composition for tunnel blind pipes, characterized in that: Includes detergents, film formers and corrosion inhibitors; The detergent comprises 50 to 60 parts by mass of water, 25 to 30 parts by mass of formic acid, 10 to 20 parts by mass of citric acid, and 1 to 1.5 parts by mass of an acidic thickener; The film-forming agent comprises 3 to 6 parts by mass of silicon dioxide nanoparticles, 10 parts by mass of silicon waterproofing agent, and 15 to 30 parts by mass of water; The corrosion inhibitor comprises 95 parts by mass of silica gel and 8-10 parts by mass of hydroxyethylidene diphosphonic acid solution.

2. The long-acting anti-scaling composition for tunnel blind pipe according to claim 1, characterized in that: The average particle size of the silicon dioxide nanoparticles is 7 nm.

3. The long-acting anti-scaling composition for tunnel blind pipe according to claim 1, characterized in that: The silicone waterproofing agent is a water-based solvent-free silane or siloxane emulsion.

4. A long-term anti-scaling method using the long-term anti-scaling composition for tunnel blind pipes according to any one of claims 1 to 3, characterized in that: The following steps are involved: The detergent is prepared by uniformly mixing 50 to 60 parts by weight of water, 25 to 30 parts by weight of formic acid, 10 to 20 parts by weight of citric acid, and 1 to 1.5 parts by weight of an acidic thickener; 3 to 6 parts by weight of silicon dioxide nanoparticles, 10 parts by weight of silicon waterproofing agent, and 15 to 30 parts by weight of water are uniformly mixed to prepare a film-forming agent; Immersing 95 parts by weight of silica gel in a hydroxyethylidene diphosphonic acid solution, and when the silica gel absorbs 8 to 10 parts by weight of the hydroxyethylidene diphosphonic acid solution, heating, curing, and crushing the silica gel adsorbing the hydroxyethylidene diphosphonic acid solution to obtain a corrosion inhibitor; The detergent is injected through one end of the tunnel blind pipe and then discharged from the other end of the tunnel blind pipe to quickly penetrate and decompose the crystals on the wall of the tunnel blind pipe; Filling the decomposed and crystallized blind tube with the film-forming agent and then drawing it out to allow the film-forming agent to form a water-based super-hydrophobic film layer on the tube wall; The corrosion inhibitor is spread on the aqueous super-hydrophobic film layer to inhibit the formation of crystals on the tube wall.

5. The long-term anti-scaling method according to claim 4, characterized in that: After the film-forming agent is extracted, the water-based super-hydrophobic film layer is cured at room temperature for 3 hours.