Water-based coating for resisting gas leakage as well as preparation method and application of water-based coating

Abstract

The invention discloses a water-based coating for resisting gas leakage as well as a preparation method and application of the water-based coating. The water-based coating is prepared from 25 to 35 parts of organic silicon modified acrylic synthetic emulsion, 20 to 30 parts of emulsified asphalt, 715 parts of neoprene emulsion, 20 to 30 parts of filler, 3 to 10 parts of deionized water, 0.3 to 1.0 part of vulcanization cross-linking agent and auxiliaries, wherein the vulcanization cross-linking agent comprises the following raw materials in parts by weight: 30-40% of deionized water, 40-45% of zinc oxide, 5-10% of sulfur, 5-10% of an anti-aging agent D and 5-10% of an accelerant. The sealing coating disclosed by the invention can be adopted, so that the environmental protection property and the safety are greatly improved, and the construction difficulty of the product is greatly reduced. After the product is constructed, an integral closed coating is formed, no lapped seam is generated, the phenomenon of peeling and falling at the lapped seam in the later period is avoided, and the long-term gas tightness of the gas storage is ensured.

Description

Technical Field

[0001] The invention relates to the field of water-based coatings, and in particular to a water-based coating for preventing gas leakage, and a preparation method and application thereof. Background Art

[0002] Gas storage tanks are used in many industries. They are usually large containers with a volume of more than 50 cubic meters. For example, the gas storage tanks of compressed air energy storage systems are generally glass fiber reinforced plastic tanks, steel tanks, concrete tanks, etc. Large compressed air devices usually transform natural spaces such as underground salt mines, hard rock caves or porous caves into gas storage tanks. Since the stored gas is usually in a compressed state, high requirements are placed on the sealing of the inner surface of the gas storage tank. In addition, the pressure is in a dynamic change, and the gas storage tank is prone to deformation. The stored gas may also cause corrosion on the inner surface of the container. The above factors place high requirements on the sealing of the inner surface of the container.

[0003] FRP storage tanks, steel storage tanks, and concrete storage tanks have the advantages of easy processing, low cost, high strength, corrosion resistance, high and low temperature resistance, and long service life, but they also have the disadvantages of easy deformation, poor gas sealing of processing gaps, and easy gas leakage. In the prior art, the solution to improve the sealing and corrosion resistance of gas storage containers is to paste a layer of 3-5mm thick butyl rubber diaphragm on the inner wall of the gas storage reservoir, but this method is complicated, the sealing treatment of the seams of the rubber sheet is difficult, the construction efficiency is low, the cost is high, and it is difficult to adapt to the pressure difference changes during filling and deflation, resulting in the rubber diaphragm peeling off from the substrate, and the sealing performance cannot be guaranteed. Although concrete storage tanks and natural space gas storage reservoirs are not prone to container deformation, the surface treatment of the substrate is difficult, and the diaphragm is difficult to effectively fit. It is necessary to apply adhesive on the substrate and the rubber sheet. During the drying process of the adhesive, its toxic and harmful organic solvents will inevitably volatilize and release into the container in large quantities, which poses serious environmental protection and safety problems, and the working environment of the staff is poor and the construction is difficult. Although the water-based coatings in the prior art can be used to coat the inner surface of containers, the airtightness index after film formation does not meet the container sealing requirements at all and cannot meet the processing needs of the inner surface of such containers.

[0004] In summary, the coating for sealing the inner surface of large gas storage containers needs to be further improved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology and provide an anti-gas leakage water-based coating for surface treatment inside a gas storage reservoir and a preparation method and application thereof.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is: A water-based paint for preventing gas leakage comprises the following ingredients in parts by weight: 25-35 parts of organosilicon-modified acrylic synthetic emulsion, 20-30 parts of emulsified asphalt, 7-15 parts of chloroprene emulsion, 20-30 parts of filler, 3-10 parts of deionized water, 0.3-1.0 parts of a vulcanizing crosslinking agent and an auxiliary agent; the vulcanizing crosslinking agent comprises the following raw materials in parts by weight: 30-40% of deionized water, 40-45% of zinc oxide, 5-10% of sulfur, 5-10% of an antioxidant D and 5-10% of an accelerator.

[0007] Furthermore, the vulcanization cross-linking agent also includes 0.1-0.3% defoaming agent, 0.2-0.6% dispersant and 0.1-0.4% cellulose.

[0008] Furthermore, the preparation method of the vulcanization cross-linking agent comprises the following steps: adding deionized water into a stirring tank, adding cellulose, a dispersant, zinc oxide, an accelerator, sulfur, an antioxidant D, and a defoaming agent in sequence under stirring, and maintaining stirring for 15-25 minutes, and then grinding with a sand mill to obtain a vulcanization cross-linking agent with a fineness of ≤30 μm.

[0009] Furthermore, the organosilicon-modified acrylic synthetic emulsion is an organosilicon-modified styrene-acrylic emulsion or an organosilicon-modified pure acrylic emulsion.

[0010] Furthermore, the glass transition temperature of the organosilicon-modified acrylic synthetic emulsion is 15-30°C, the solid content is 45-50wt%, and the particle size is 100-200nm. By selecting a suitable glass transition temperature, the balance between hardness and flexibility after film formation can be ensured.

[0011] Furthermore, the emulsified asphalt is anionic or non-ionic.

[0012] Furthermore, the solid content of the emulsified asphalt is 60-65%, the pH value is 7-10, the chloroprene emulsion is anionic or non-ionic, and the solid content of the chloroprene emulsion is 55-60%.

[0013] Furthermore, the additives include 0.2-0.5 parts of dispersant, 0.2-0.5 parts of defoamer, 0.1-0.3 parts of wetting agent, 0.1-0.2 parts of multifunctional additive, 0.1-0.5 parts of anti-settling agent, 0.5-2 parts of film-forming additive, 0.3-0.6 parts of thickener, 0.1-0.4 parts of preservative and 0.2-0.4 parts of silane coupling agent.

[0014] Furthermore, the dispersant is sodium salt or ammonium salt of polyacrylate, the defoamer is mineral oil or silicone defoamer, the wetting agent is a nonionic surfactant, the multifunctional additive is AMP-95, whose chemical name is 2-amino-2-methyl-1-propanol, the anti-settling agent is magnesium aluminum silicate, the film-forming additive is alcohol ester twelve, the thickener is a polyurethane thickener and an acrylic acid associative thickener, the preservative is a BIT preservative, and the silane coupling agent is KH-560, whose chemical name is γ-glycidyloxypropyltrimethoxysilane.

[0015] Furthermore, the filler is quartz powder or heavy calcium powder, or a mixture of the two.

[0016] Based on the same technical concept, the present invention also provides a method for preparing the above-mentioned water-based coating for gas leakage resistance, comprising the following steps: after adding the organosilicon-modified acrylic synthetic emulsion, start stirring at a speed of 500-600r / min, then add dispersant, wetting agent, defoaming agent, multifunctional additive, anti-settling agent, filler and deionized water in sequence, increase the speed to 800-1000r / min, and perform dispersion and pulping for 30-40min. After the slurry fineness is ≤50μm, reduce the stirring speed to 500-600r / min, then add film-forming aid, emulsified asphalt and chloroprene emulsion in sequence, keep stirring for 5-15min, finally add thickener, and increase the speed to 600-800r / min, keep thickening for 15-25min, finally add vulcanized crosslinking agent, preservative and silane coupling agent, and stir evenly to obtain the water-based coating for gas leakage resistance.

[0017] Based on the same technical concept, the present invention also provides the use of the above-mentioned water-based coating for anti-gas leakage as a sealing material in a gas storage reservoir, wherein the water-based coating is applied to the inner surface of any gas storage reservoir in a concrete container, a fiberglass container, a steel container or an underground mine to form an overall inner surface film layer.

[0018] Furthermore, the thickness of the inner surface film layer is greater than 2 mm.

[0019] Furthermore, the method for coating the inner surface of the gas storage reservoir comprises the following steps: cleaning the inner surface of the gas storage reservoir, spraying any of the aforementioned water-based coatings evenly on the inner surface of the gas storage reservoir, applying the coatings twice or more, with an interval of 5-8 hours between each application, and drying the coatings naturally for more than 7 days.

[0020] The principle of the present invention is: The present invention adopts organic silicon modified acrylic synthetic emulsion as the main component, which is the main film-forming substance with good film-forming property. As it is a polar material, it has good adhesion to most materials, high temperature resistance, good tensile strength, good wrapping property for fillers, and can effectively wrap fillers.

[0021] The present invention selects emulsified asphalt as the secondary film-forming substance, which is also a polar material with good adhesion and elongation at break. It has a plasticizing effect on the main film-forming material, silicone-modified propylene emulsion. The two interact with each other, so that after the coating is film-formed, the film is bright, dense and has good air tightness.

[0022] The present invention selects chloroprene emulsion as the auxiliary film-forming substance, which can improve the elasticity, high temperature resistance, air tightness and elongation of the product. The air tightness after film formation in the present invention is described by the value of gas permeability. The lower the index, the better. According to the process requirements of gas storage in gas storage, it cannot be greater than 5.0×10 -16 mol / (㎡.sP).

[0023] The dispersant selected by the present invention is sodium acrylate or ammonium salt dispersant, which has a very ideal dispersing effect on the filler. When used with a wetting agent, the dispersing effect can be significantly improved during the dispersion and beating process of the filler, and the dispersion and beating time can be reduced, thereby improving efficiency. The multifunctional auxiliary agent selected by the present invention is an organic amine, which not only helps the wetting and dispersion of the powder, but also improves the pH value of the coating system, which is conducive to the rapid thickening effect of the later thickener. The addition of the anti-settling agent is to improve the stability of the product system, avoid precipitation and stratification during the later storage process of the coating, and is also conducive to improving the anti-sagging property of the later coating construction. The KH-560 silane coupling agent selected by the present invention contains an epoxy group, which can make the bonding strength of the water-based coating to the substrate better, and also can improve the peeling strength.

[0024] The present invention further adds and uses a vulcanization cross-linking agent, which can promote the vulcanization cross-linking of the chloroprene emulsion and the emulsified asphalt, thereby improving the durability and high temperature resistance of the coating film.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts organic silicon modified acrylic synthetic emulsion as the main component, emulsified asphalt as the secondary film-forming component, chloroprene emulsion as the auxiliary film-forming component, and the chloroprene emulsion and emulsified asphalt are vulcanized and cross-linked by a vulcanization cross-linking agent, so that the air tightness of the water-based paint after film formation is greatly improved. The overall performance of the paint is optimized, especially the high and low temperature resistance, hot air aging resistance, corrosion resistance and mechanical properties after film formation are excellent.

[0026] 2. Since the coating provided by the present invention is a water-based coating, it can be applied by spraying, rolling, brushing, etc. The above-mentioned construction methods can be selected according to the large volume of the gas storage and the large inner surface painting construction area, which significantly improves the construction efficiency and meets the construction requirements of water-based coatings that must be used within 24 hours. It has great advantages in safety, environmental protection, construction convenience and cost control. Compared with the rubber sheet sealing method used in the prior art, the product of the present invention has high construction efficiency, does not require the use of adhesives, avoids the volatilization of toxic and harmful substances in the container, and improves the environmental protection and safety of construction.

[0027] 3. The coating provided by the present invention can adapt to the construction needs of various gas storage substrates and meet the construction requirements of existing gas storage substrates. It can form a film on various substrates and has good bonding strength. The resulting coating body has good tensile strength, high elongation at break, good elasticity, strong air tightness, anti-peeling, high and low temperature resistance, corrosion resistance, and good durability.

[0028] 4. The coating provided by the present invention can make the inner surface of the container form a complete closed coating without overlaps after construction, thereby structurally preventing the occurrence of tearing and peeling caused by overlaps. The formed closed coating has a certain tensile strength and can adapt to certain deformation of the container, thereby improving the performance of the gas storage, adapting to a series of changes caused by changes in air pressure in the container, meeting the requirements of various working conditions, and increasing the service life of the gas storage. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully in combination with preferred embodiments below, but the protection scope of the present invention is not limited to the following specific embodiments.

[0030] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0031] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0032] Raw material description: The raw materials used in the present invention are all commercially available materials. Organic silicon modified acrylic emulsion model EM-3132, Jiangmen Jinqiao New Materials; chloroprene emulsion model AE101, Japan Showa Denko; emulsified asphalt is non-ionic emulsified asphalt, model NEA-21, China Chemical Zhuzhou Rubber Research and Design Institute; filler is 800 mesh calcium carbonate, Jiangxi Fenglei; defoamer is mineral oil, model NXZ, Japan Nopco; preservative is BIT preservative, model 310, Shanghai Maiken; anti-settling agent is magnesium aluminum silicate, model XC-19, Hunan Pengtai; silane coupling agent model KH-560, Jiangxi Chenguang New Materials.

[0033] A specific embodiment of the present invention is a water-based coating for preventing gas leakage on the inner surface of a gas storage reservoir for air energy storage power generation. The gas storage reservoir is any one of a glass fiber reinforced plastic storage tank, a steel storage tank, and a concrete storage tank. The water-based coating for preventing gas leakage comprises the following ingredients in parts by weight: 25-35 parts of an organosilicon-modified acrylic synthetic emulsion, 20-30 parts of an emulsified asphalt, 7-15 parts of a chloroprene emulsion, 0.2-0.5 parts of a dispersant, 0.2-0.5 parts of a defoaming agent, 0.1-0.3 parts of a wetting agent, 0.1-0.2 parts of a multifunctional additive, 0.1-0.5 parts of an anti-settling agent, 0.5-2 parts of a film-forming additive, 20-30 parts of a filler, 0.3-0.6 parts of a thickener, 0.3-1.0 parts of a vulcanized crosslinking agent, 0.1-0.4 parts of a preservative, 3-10 parts of deionized water, and 0.2-0.4 parts of a silane coupling agent.

[0034] In a preferred embodiment, the following ingredients are included in parts by weight: 32 parts of organosilicon-modified styrene-acrylic emulsion, 25 parts of emulsified asphalt, 20 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoaming agent, 9.7 parts of deionized water, 0.3 parts of anti-settling agent, 0.45 parts of thickener, 0.6 parts of film-forming aid, 10 parts of chloroprene emulsion, 0.3 parts of preservative, 0.45 parts of vulcanization crosslinking agent, and 0.2 parts of silane coupling agent.

[0035] In one embodiment, the vulcanization crosslinking agent includes the following raw materials in parts by weight: 30-40% deionized water, 40-45% zinc oxide, 5-10% sulfur, 5-10% antioxidant D, 5-10% accelerator CH, 0.1-0.3% defoamer, 0.2-0.6% dispersant and 0.1-0.4% HEC cellulose. They are used to improve the comprehensive performance of the material, especially the high and low temperature resistance, aging resistance, adhesion, corrosion resistance and mechanical properties of the material.

[0036] The preparation method of the vulcanization crosslinking agent of the following embodiment is: (1) Add deionized water into the stirring tank and start the stirring speed at 300-500r / min. Add HEC cellulose and dispersant in sequence and stir for 5 minutes. When the cellulose is completely dissolved and the viscosity of the material increases, slowly add zinc oxide, accelerator CH, sulfur, antioxidant D and defoamer and keep stirring for 20 minutes to obtain a pre-dispersed slurry.

[0037] (2) Grind the pre-dispersed slurry in a horizontal sand mill and test it with a scraper fineness tester. The fineness should be ≤30μm, and the vulcanization cross-linking agent is obtained.

[0038] In one embodiment, the glass transition temperature of the organosilicon-modified styrene-acrylic emulsion or organosilicon-modified pure acrylic emulsion is 15-30°C, the solid content is 45-50wt%, and the particle size is 100-200nm. The solid content of the anionic or non-ionic emulsified asphalt is 60-65%, and the pH value is 7-10. The chloroprene emulsion is non-ionic and has a solid content of 55-60%. More preferably, 32 parts of organosilicon-modified styrene-acrylic emulsion, 25 parts of non-ionic emulsified asphalt, 10 parts of non-ionic chloroprene emulsion, and 20 parts of 800 mesh heavy calcium powder.

[0039] In a preferred embodiment, the dispersant is sodium salt or ammonium salt of polyacrylic acid, the defoamer is mineral oil or silicone defoamer, the wetting agent is a nonionic surfactant, the multifunctional additive is AMP-95, the anti-settling agent is magnesium aluminum silicate, the film-forming additive is alcohol ester twelve, the filler is 800 mesh quartz powder or heavy calcium powder, the thickener is a polyurethane thickener and an acrylic acid associative thickener, the preservative is a BIT preservative, and the silane coupling agent is KH-560.

[0040] A method for preparing a water-based coating for preventing gas leakage according to a specific embodiment of the present invention comprises the following steps: (1) First, add the silicone-modified styrene-acrylic emulsion and start stirring (preferably at a speed of 500-600 r / min). Then, add the dispersant, wetting agent, multifunctional additive, 1 / 2 of the formula amount of defoamer, anti-settling agent and deionized water in sequence and stir for 5-10 minutes. The defoamer is added in stages to ensure the effect of early foam suppression and late defoaming.

[0041] (2) Add filler, increase the speed to 800-1000r / min for high-speed dispersion and slurry beating for about 30-40 minutes. When the slurry fineness is ≤50μm, reduce the stirring speed to 500-600r / min, add film-forming aid and keep stirring; low-speed stirring is conducive to adding pigments and fillers. High-speed dispersion in the middle stage is for grinding and slurry beating, which is conducive to reducing the fineness of the slurry. Reduce the speed in the latter stage to ensure the completion of the degassing and defoaming process.

[0042] (3) Add emulsified asphalt and stir evenly, maintaining 500-600r / min, then add chloroprene emulsion and keep stirring for 5-10 minutes.

[0043] (4) Slowly add thickener and appropriately increase the speed to 700-800r / min for thickening. Continue stirring for 10-15 minutes to increase the viscosity of the product and ensure the later storage stability and workability.

[0044] (5) Add the vulcanized crosslinking agent, preservative and silane coupling agent in sequence, keep stirring for 5-10 minutes, and when the viscosity reaches the design requirement, add the remaining 1 / 2 of the defoaming agent and stir for 5-10 minutes to achieve defoaming. The water-based coating for anti-gas leakage is thus obtained.

[0045] Example 1 The water-based paint for preventing gas leakage of this embodiment comprises the following ingredients in parts by weight: 30 parts of organosilicon-modified styrene-acrylic emulsion, 20 parts of emulsified asphalt, 30 parts of filler, 0.3 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoamer, 6.6 parts of deionized water, 0.3 parts of anti-settling agent, 0.45 parts of thickener, 0.6 parts of film-forming aid, 10 parts of chloroprene emulsion, 0.3 parts of preservative, 0.45 parts of vulcanization cross-linking agent, and 0.2 parts of silane coupling agent. Among them, the vulcanization cross-linking agent contains 31.6% deionized water, 42.5% zinc oxide, 5.2% sulfur, 10% antioxidant D, 10% accelerator CH, 0.1% defoamer, 0.4% dispersant, and 0.2% HEC cellulose.

[0046] The preparation method of the water-based coating for preventing gas leakage in this embodiment is as follows: ① First, add the silicone-modified styrene-acrylic emulsion and start stirring (preferably at a speed of 500-600r / min), then add dispersant, wetting agent, multifunctional additive, 1 / 2 of the formula amount of defoamer, anti-settling agent and deionized water in sequence and stir for 5-10 minutes; the defoamer is added in stages to ensure the effect of early foam suppression and late defoaming. ② Add fillers, increase the speed to 800-1000r / min for high-speed dispersion and beating for about 30-40 minutes. When the slurry fineness is ≤50μm, reduce the stirring speed to 500-600r / min, add film-forming additives and keep stirring; low-speed stirring is conducive to adding pigments and fillers, high-speed dispersion in the middle stage is grinding and beating, which is conducive to reducing the fineness of the slurry, and reducing the speed in the latter stage is a defoaming and defoaming process; ③ Add emulsified asphalt and stir evenly, maintaining 500-600r / min , then add chloroprene emulsion and keep stirring for 5-10 minutes; ④ Slowly add thickener, and appropriately increase the speed to 700-800r / min for thickening, and continue stirring for 10-15 minutes to increase the viscosity of the product and ensure the later storage stability and construction performance; ⑤ Add vulcanized cross-linking agent, preservative and silane coupling agent in sequence, keep stirring for 5-10 minutes, and when the viscosity reaches the design requirement, add the remaining 1 / 2 of the defoaming agent and stir for 5-10 minutes for defoaming; ⑥ Detection, filtration, and packaging.

[0047] Example 2 The water-based paint for preventing gas leakage of this embodiment comprises the following ingredients in parts by weight: 27 parts of organosilicon-modified styrene-acrylic emulsion, 22 parts of emulsified asphalt, 25 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.4 parts of defoamer, 9.6 parts of deionized water, 0.3 parts of anti-settling agent, 0.55 parts of thickener, 0.6 parts of film-forming aid, 13 parts of chloroprene emulsion, 0.3 parts of preservative, 0.6 parts of vulcanization cross-linking agent, and 0.2 parts of silane coupling agent. Among them, the vulcanization cross-linking agent contains 34.1% deionized water, 40.5% zinc oxide, 10% sulfur, 5% antioxidant D, 6% accelerator CH, 0.1% defoamer, 0.4% dispersant, and 0.2% HEC cellulose.

[0048] The preparation method of the water-based coating for preventing gas leakage in this embodiment is as follows: ① First, add the silicone-modified pure acrylic emulsion and start stirring (preferably at a speed of 500-600r / min), then add dispersant, wetting agent, multifunctional additive, 1 / 2 of the formula amount of defoamer, anti-settling agent and deionized water in sequence and stir for 5-10 minutes; the defoamer is added in stages to ensure the effect of early foam suppression and late defoaming. ② Add fillers, increase the speed to 800-1000r / min for high-speed dispersion and beating for about 30-50min. When the slurry fineness is ≤50μm, reduce the stirring speed to 500-600r / min, add film-forming additives and keep stirring; low-speed stirring is conducive to adding pigments and fillers, high-speed dispersion in the middle stage is grinding and beating, which is conducive to reducing the fineness of the slurry, and reducing the speed in the latter stage is a defoaming and defoaming process; ③ Add emulsified asphalt and stir evenly, maintaining 500-600r / min , then add chloroprene emulsion and keep stirring for 5-10 minutes; ④ Slowly add thickener, and appropriately increase the speed to 700-800r / min for thickening, and continue stirring for 10-15 minutes. The purpose is to increase the viscosity of the product and ensure the later storage stability and construction performance; ⑤ Add vulcanized cross-linking agent, preservative and silane coupling agent in sequence, keep stirring for 5-10 minutes, and when the viscosity reaches the design requirement, add the remaining 1 / 2 of the defoaming agent and stir for 5-10 minutes for defoaming; ⑥ Detection, filtration, and packaging.

[0049] Example 3 The water-based paint for preventing gas leakage of this embodiment comprises the following ingredients in parts by weight: 35 parts of organosilicon-modified styrene-acrylic synthetic emulsion, 28 parts of emulsified asphalt, 20 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.4 parts of defoamer, 7.0 parts of deionized water, 0.3 parts of anti-settling agent, 0.4 parts of thickener, 0.6 parts of film-forming aid, 7 parts of chloroprene emulsion, 0.3 parts of preservative, 0.3 parts of vulcanization cross-linking agent, and 0.2 parts of silane coupling agent. The vulcanization cross-linking agent contains 29.5% of deionized water, 45% of zinc oxide, 5% of sulfur, 10% of antioxidant D, 9.8% of accelerator CH, 0.1% of defoamer, 0.4% of dispersant, and 0.2% of HEC cellulose.

[0050] The preparation method of the water-based coating for preventing gas leakage in this embodiment is as follows: ① First, add the silicone-modified pure acrylic emulsion and start stirring (preferably at a speed of 500-600r / min), then add dispersant, wetting agent, multifunctional additive, 1 / 2 of the formula amount of defoamer, anti-settling agent and deionized water in sequence and stir for 5-10 minutes; the defoamer is added in stages to ensure the effect of early foam suppression and late defoaming. ② Add fillers, increase the speed to 800-1000r / min for high-speed dispersion and beating for about 30-50min. When the slurry fineness is ≤50μm, reduce the stirring speed to 500-600r / min, add film-forming additives and keep stirring; low-speed stirring is conducive to adding pigments and fillers, high-speed dispersion in the middle stage is grinding and beating, which is conducive to reducing the fineness of the slurry, and reducing the speed in the latter stage is a defoaming and defoaming process; ③ Add emulsified asphalt and stir evenly, maintaining 500-600r / min , then add chloroprene emulsion and keep stirring for 5-10 minutes; ④ Slowly add thickener, and appropriately increase the speed to 700-800r / min for thickening, and continue stirring for 10-15 minutes to increase the viscosity of the product and ensure the later storage stability and construction performance; ⑤ Add vulcanized cross-linking agent, preservative and silane coupling agent in sequence, keep stirring for 5-10 minutes, and when the viscosity reaches the design requirement, add the remaining 1 / 2 of the defoaming agent and stir for 5-10 minutes for defoaming; ⑥ Detection, filtration, and packaging.

[0051] Example 4 The water-based paint for preventing gas leakage of this embodiment comprises the following ingredients in parts by weight: 25 parts of organosilicon-modified styrene-acrylic synthetic emulsion, 30 parts of emulsified asphalt, 20 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoamer, 6.0 parts of deionized water, 0.3 parts of anti-settling agent, 0.4 parts of thickener, 0.6 parts of film-forming aid, 15 parts of chloroprene emulsion, 0.3 parts of preservative, 1.0 parts of vulcanized crosslinking agent, and 0.4 parts of silane coupling agent. The vulcanized crosslinking agent contains 32.5% deionized water, 45% zinc oxide, 5% sulfur, 10% antioxidant D, 6.8% accelerator CH, 0.1% defoamer, 0.4% dispersant, and 0.2% HEC cellulose.

[0052] The preparation method of the water-based coating for preventing gas leakage in this embodiment is as follows: ① First, add the silicone-modified pure acrylic emulsion and start stirring (preferably at a speed of 500-600r / min), then add dispersant, wetting agent, multifunctional additive, 1 / 2 of the formula amount of defoamer, anti-settling agent and deionized water in sequence and stir for 5-10 minutes; the defoamer is added in stages to ensure the effect of early foam suppression and late defoaming. ② Add fillers, increase the speed to 800-1000r / min for high-speed dispersion and beating for about 30-50min. When the slurry fineness is ≤50μm, reduce the stirring speed to 500-600r / min, add film-forming additives and keep stirring; low-speed stirring is conducive to adding pigments and fillers, high-speed dispersion in the middle stage is grinding and beating, which is conducive to reducing the fineness of the slurry, and reducing the speed in the latter stage is a defoaming and defoaming process; ③ Add emulsified asphalt and stir evenly, maintaining 500-600r / min , then add chloroprene emulsion and keep stirring for 5-10 minutes; ④ Slowly add thickener, and appropriately increase the speed to 700-800r / min for thickening, and continue stirring for 10-15 minutes to increase the viscosity of the product and ensure the later storage stability and construction performance; ⑤ Add vulcanized cross-linking agent, preservative and silane coupling agent in sequence, keep stirring for 5-10 minutes, and when the viscosity reaches the design requirement, add the remaining 1 / 2 of the defoaming agent and stir for 5-10 minutes for defoaming; ⑥ Detection, filtration, and packaging.

[0053] Comparative Example 1 The only difference from Example 1 is that no vulcanization crosslinking agent is used.

[0054] The invention comprises the following components in parts by weight: 32 parts of organosilicon-modified styrene-acrylic emulsion, 25 parts of emulsified asphalt, 20 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoamer, 9.7 parts of deionized water, 0.3 parts of anti-settling agent, 0.45 parts of thickener, 0.6 parts of film-forming aid, 10 parts of chloroprene emulsion, 0.3 parts of preservative, and 0.2 parts of silane coupling agent. The rest is the same as in Example 1.

[0055] Comparative Example 2 The only difference from Example 1 is that the ratio of the vulcanization cross-linking agent used is different.

[0056] The composition comprises the following components in parts by weight: 32 parts of organosilicon-modified styrene-acrylic emulsion, 25 parts of emulsified asphalt, 20 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoamer, 9.7 parts of deionized water, 0.3 parts of anti-settling agent, 0.45 parts of thickener, 0.6 parts of film-forming aid, 10 parts of chloroprene emulsion, 0.3 parts of preservative, and 0.2 parts of silane coupling agent. Among them, the vulcanization crosslinking agent contains 42.5% of deionized water, 32.2% of zinc oxide, 11% of sulfur, 5.4% of antioxidant D, 8.2% of accelerator CH, 0.1% of defoamer, 0.4% of dispersant and 0.2% of HEC cellulose. The rest is the same as in Example 1.

[0057] Comparative Example 3 The only difference from Example 1 is that an excess amount of vulcanization crosslinking agent is added.

[0058] The invention comprises the following components in parts by weight: 35 parts of organosilicon-modified styrene-acrylic synthetic emulsion, 28 parts of emulsified asphalt, 20 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoamer, 7.0 parts of deionized water, 0.3 parts of anti-settling agent, 0.4 parts of thickener, 0.6 parts of film-forming aid, 7 parts of chloroprene emulsion, 0.3 parts of preservative, 1.5 parts of vulcanization crosslinking agent, and 0.2 parts of silane coupling agent. The rest is the same as in Example 1.

[0059] Comparative Example 4 The only difference from Example 1 is that the vulcanization cross-linking agent is not prepared in advance, and various raw materials are directly added during the material production process.

[0060] The invention comprises the following components in parts by weight: 35 parts of organosilicon-modified styrene-acrylic synthetic emulsion, 28 parts of emulsified asphalt, 20 parts of filler, 0.3 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoamer, 5.8 parts of deionized water, 0.3 parts of anti-settling agent, 0.4 parts of thickener, 0.6 parts of film-forming aid, 7 parts of chloroprene emulsion, 0.3 parts of preservative, 0.2 parts of silane coupling agent. 0.6 parts of zinc oxide, 0.2 parts of sulfur, 0.2 parts of antioxidant D, 0.2 parts of accelerator CH, 0.2 parts of HEC cellulose. The rest is the same as in Example 1.

[0061] Comparative Example 5 The only difference from Example 1 is that no emulsified asphalt is used.

[0062] The invention comprises the following components in parts by weight: 50 parts of organosilicon-modified styrene-acrylic synthetic emulsion, 20 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoamer, 7.0 parts of deionized water, 0.3 parts of anti-settling agent, 0.4 parts of thickener, 0.6 parts of film-forming aid, 20 parts of chloroprene emulsion, 0.3 parts of preservative, 1.5 parts of vulcanization crosslinking agent, and 0.2 parts of silane coupling agent. The rest is the same as in Example 1.

[0063] Comparative Example 6 The only difference from Example 1 is that no chloroprene emulsion is used.

[0064] The invention comprises the following components in parts by weight: 40 parts of organosilicon-modified styrene-acrylic synthetic emulsion, 30 parts of emulsified asphalt, 20 parts of filler, 0.2 parts of dispersant, 0.2 parts of wetting agent, 0.1 parts of multifunctional additive, 0.5 parts of defoamer, 7.0 parts of deionized water, 0.3 parts of anti-settling agent, 0.4 parts of thickener, 0.6 parts of film-forming aid, 0.3 parts of preservative, 0.3 parts of vulcanization crosslinking agent, and 0.2 parts of silane coupling agent. The rest is the same as in Example 1.

[0065] The water-based paint obtained in the above embodiment is applied to the inner wall of an air storage tank made of glass fiber reinforced plastic with a volume of 50 cubic meters. The construction method is airless spraying, which is carried out in 2 times. After the construction is completed, a film layer with a total thickness of 2-3 mm is obtained, and it is naturally dried for more than 7 days. The inner surface of the air storage tank is covered with the coating film layer as a whole, forming an overall film layer structure. The air storage tank is subjected to a performance test, and an inflation and deflation test is carried out with compressed air as the medium. When inflated, the gas pressure reaches 12.5MPa and the gas temperature is 117°C. After maintaining the pressure for 12 hours, the pressure is 11.2MPa and the gas temperature is 104°C, indicating that the gas storage tank has good gas tightness, no leakage occurs, and the sealing requirements are met.

[0066] The water-based coatings obtained in the above-mentioned embodiments and comparative examples were respectively applied to the coating construction of the inner surface of an air storage tank made of glass fiber reinforced plastic with a volume of 50 cubic meters according to the above-mentioned method, and the performance of the water-based coating film was tested. The results are shown in Table 1.

[0067] Table 1: Performance test results of water-based coatings prepared in Examples and Comparative Examples after film formation

[0068] Analysis of the above data shows that the key indicator gas permeability of Examples 1-4 is less than 4 mol / (㎡.s.Pa), and there is no blistering phenomenon. The tensile strength, elongation at break, bonding strength, peel strength and other properties are excellent and balanced, and an ideal water-based coating that can be used to prevent gas leakage is obtained.

[0069] By analyzing the comparative examples, it can be seen that: Comparative Example 1 does not use a vulcanized cross-linking agent, and the rubber molecules and asphalt in the coating are not cross-linked, so the elongation of the product is very high, but the tensile strength and bonding strength are low, the gas permeability becomes high, the heat resistance is poor, and severe blistering occurs.

[0070] Comparative Example 2 uses a vulcanization cross-linking system with a different ratio. Although it has a certain cross-linking effect, the degree of cross-linking is not enough. Therefore, its tensile strength and peel strength are not high, the heat resistance is poor, and there is blistering.

[0071] In comparative example 3, excessive crosslinking agent is added, resulting in higher tensile strength and bonding strength, but lower elongation and peel strength.

[0072] In Comparative Example 4, the cross-linking agent was not prepared in advance but was directly added during the production process, resulting in the cross-linking agent not being able to function. Although the elongation was slightly higher, the tensile strength and peel strength were low, the heat resistance was also not ideal, and there was slight blistering.

[0073] Comparative Example 5 does not use emulsified asphalt. The tensile strength and elongation at break of the product are good, but the bonding strength and peel strength are very low, and the gas permeability is also high.

[0074] Comparative Example 6 did not use chloroprene emulsion, and the bonding strength of the product became higher. No cross-linking of chloroprene emulsion and asphalt occurred, so the tensile strength and elongation at break were poor, and the gas permeability was also high.

[0075] It can be seen from the data of the above embodiments and comparative examples that the addition of emulsified asphalt is of great help to the bonding strength, air tightness and peel strength of the material; the addition of chloroprene emulsion is of great help to the elongation at break, air tightness and heat resistance of the material; the vulcanization cross-linking agent significantly improves the comprehensive performance of the product and is an indispensable key material.

[0076] The water-based coating obtained in the above embodiment is applied to the inner wall of an air storage tank made of concrete with a volume of 100 cubic meters. The construction method is roller coating, and the construction number is 3 times. After the construction is completed, a film layer with a total thickness of 4 mm is obtained. After natural curing for more than 7 days, the inner wall of the air storage tank is completely covered to form an overall film layer structure. The gas storage tank is tested for performance, and an inflation and deflation test is performed with air as the medium. The original air storage tank inflation pressure is 10.8MPa and the temperature is 113°C. After 12 hours, the pressure is 10.3MPa and the gas temperature is 105°C, indicating that the gas storage tank has good gas tightness, no leakage occurs, and the sealing requirements are met.

[0077] The water-based coating obtained in the above embodiment is applied to the inner wall of a steel air storage tank with a volume of 50 cubic meters. The construction method is brush coating, and the construction number is 2 times. After the construction is completed, a film layer with a total thickness of 3 mm is obtained. It is naturally dried for more than 7 days. The inner wall of the air storage tank is completely covered to form an overall film layer structure. The gas storage tank is tested for performance, and an inflation and deflation test is performed with air as the medium. The original air storage tank inflation pressure is 11.2MPa and the temperature is 114°C. After 12 hours, the pressure is 10.7MPa and the gas temperature is 104°C, indicating that the gas storage tank has good gas tightness, no leakage occurs, and the sealing requirements are met.

[0078] The above examples show that the water-based coating for preventing gas leakage prepared by the present invention has excellent properties in all aspects, including bonding strength>1.2MPa, tensile strength>1.5MPa, elongation at break>300%, peel strength>4.0N / mm, gas permeability<5.0×10 -16 mol / (㎡.s.Pa), heat resistance 150℃, blistering in 48h, excellent comprehensive performance, and can meet the sealing requirements of air energy storage power generation and gas storage devices.

[0079] The present invention provides a water-based environmentally friendly liquid coating, which can be applied by spraying, rolling, brushing, etc. Compared with the sealing method of fixing solid butyl rubber sheets one by one on the inner surface of the gas storage reservoir in the prior art, its water-based liquid state significantly improves the convenience of construction and greatly reduces the difficulty of construction. Since the product of the present invention can avoid brushing adhesive on the substrate and the rubber sheet, the environmental protection and safety of the construction process are greatly improved. Since the product of the present invention forms an integral closed coating on the inner surface of the container after construction, no overlap seams will be generated, which fundamentally eliminates the phenomenon of peeling and other damage to the sealing performance caused by the overlap seams during the later use process, and can maintain the gas tightness of the gas storage reservoir for a long time, thereby increasing the service life of the gas storage reservoir, saving maintenance time, and avoiding the system from frequent shutdown and maintenance due to gas storage reservoir failure.

[0080] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A water-based coating for preventing gas leakage, characterized in that: The invention comprises the following ingredients in parts by weight: 25-35 parts of organosilicon-modified acrylic synthetic emulsion, 20-30 parts of emulsified asphalt, 7-15 parts of chloroprene emulsion, 20-30 parts of filler, 3-10 parts of deionized water, 0.3-1.0 parts of vulcanization cross-linking agent and auxiliary agent; the vulcanization cross-linking agent comprises the following raw materials in parts by weight: 30-40% of deionized water, 40-45% of zinc oxide, 5-10% of sulfur, 5-10% of antioxidant D and 5-10% of accelerator.

2. The water-based coating for preventing gas leakage according to claim 1, characterized in that: The vulcanization cross-linking agent also includes 0.1-0.3% of a defoaming agent, 0.2-0.6% of a dispersant and 0.1-0.4% of cellulose.

3. The water-based coating for preventing gas leakage according to claim 2, characterized in that: The preparation method of the vulcanization crosslinking agent comprises the following steps: adding deionized water into a stirring tank, adding cellulose, a dispersant, zinc oxide, an accelerator, sulfur, an antioxidant D, and a defoaming agent in sequence under stirring, and maintaining stirring for 15-25 minutes, and then grinding with a sand mill to obtain a vulcanization crosslinking agent with a fineness of ≤30 μm.

4. The water-based coating for preventing gas leakage according to claim 1, characterized in that: The organosilicon-modified acrylic synthetic emulsion is an organosilicon-modified styrene-acrylic emulsion or an organosilicon-modified pure acrylic emulsion. The organosilicon-modified acrylic synthetic emulsion has a glass transition temperature of 15-30° C., a solid content of 45-50 wt %, and a particle size of 100-200 nm.

5. The water-based coating for preventing gas leakage according to claim 1, characterized in that: The emulsified asphalt is anionic or nonionic, has a solid content of 60-65%, and a pH value of 7-10. The chloroprene emulsion is anionic or nonionic, and has a solid content of 55-60%.

6. The water-based coating for preventing gas leakage according to claim 1, characterized in that: The auxiliary agent comprises 0.2-0.5 parts of dispersant, 0.2-0.5 parts of defoamer, 0.1-0.3 parts of wetting agent, 0.1-0.2 parts of multifunctional auxiliary agent, 0.1-0.5 parts of anti-settling agent, 0.5-2 parts of film-forming auxiliary agent, 0.3-0.6 parts of thickener, 0.1-0.4 parts of preservative and 0.2-0.4 parts of silane coupling agent.

7. The water-based coating for preventing gas leakage according to claim 6, characterized in that: The dispersant is polyacrylic acid sodium salt or ammonium salt, the defoamer is mineral oil or silicone defoamer, the wetting agent is a nonionic surfactant, the multifunctional auxiliary agent is AMP-95, the anti-settling agent is magnesium aluminum silicate, the film-forming auxiliary agent is alcohol ester dodecahydrate, the thickener is a polyurethane thickener and an acrylic acid associative thickener, the preservative is a BIT preservative, and the silane coupling agent is KH-560.

8. A method for preparing the water-based coating for preventing gas leakage as claimed in claim 6 or 7, characterized in that: The method comprises the following steps: after adding organic silicon modified acrylic synthetic emulsion, stirring is started at a speed of 500-600 r / min, then dispersant, wetting agent, defoamer, multifunctional auxiliary agent, anti-settling agent, filler and deionized water are added in sequence, the speed is increased to 800-1000 r / min, dispersion and pulping are carried out for 30-40 minutes, after the slurry fineness is ≤50 μm, the stirring speed is reduced to 500-600 r / min, film-forming auxiliary agent, emulsified asphalt and chloroprene emulsion are added in sequence, stirring is maintained for 5-15 minutes, finally a thickener is added, the speed is increased to 600-800 r / min, thickening is maintained for 15-25 minutes, finally a vulcanized crosslinking agent, a preservative and a silane coupling agent are added, and stirring is performed evenly to obtain a water-based coating for preventing gas leakage.

9. Use of the water-based coating for preventing gas leakage as claimed in any one of claims 1 to 7 as a sealing material in a gas storage reservoir, characterized in that: The water-based paint is applied to the inner surface of any gas storage reservoir in a concrete container, a fiberglass container, a steel container or an underground mine to form an integral inner surface film layer, and the thickness of the inner surface film layer is greater than 2 mm.

10. The use according to claim 9, characterized in that: The method for coating the inner surface of the gas storage reservoir comprises the following steps: cleaning the inner surface of the gas storage reservoir, uniformly coating the water-based coating according to any one of claims 1 to 7 on the inner surface of the gas storage reservoir, applying the coating more than twice, with an interval of 5 to 8 hours between the applications, and drying the coating naturally for more than 7 days.

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