CN115785778A - Preparation method of nano coating on inner wall of incinerator - Google Patents
Preparation method of nano coating on inner wall of incinerator Download PDFInfo
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- CN115785778A CN115785778A CN202211422815.XA CN202211422815A CN115785778A CN 115785778 A CN115785778 A CN 115785778A CN 202211422815 A CN202211422815 A CN 202211422815A CN 115785778 A CN115785778 A CN 115785778A
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Abstract
The invention discloses a preparation method of a nano coating on the inner wall of an incinerator, relating to the technical field of coating preparation. The product is mainly used for coating reaction towers, dust collectors, washing towers, flue gas pipelines and other parts of waste incineration power plants. The paint film has excellent adhesive force on materials such as steel, iron, aluminum, PVE and the like, and also has long-term high temperature resistance, hydrofluoric acid resistance, mixed acid resistance, excellent corrosion resistance and wear resistance. Most importantly, the product takes organic matters as film forming substances, and the problems of pulverization, poor wear resistance and the like can not occur.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a preparation method of a nano coating on the inner wall of an incinerator.
Background
Compared with the traditional thermal power plant which mainly adopts the limestone-gypsum deacidification method, the waste incineration power plant adopts the sodium method to deacidify, the flue gas temperature after deacidification is 50-65 ℃, the flue gas is in a saturated water-containing state, the flue gas and a chimney can be corroded when the flue gas is directly discharged, and white smoke can be generated at a chimney discharge port. Therefore, the deacidified flue gas needs to be heated again, and the temperature of the flue gas at the outlet is increased to be above the acid dew point. The main modes of flue gas reheating comprise the use of external heat sources (steam, electric heating and the like) and the utilization of flue gas waste heat. In consideration of energy conservation and economy, heat exchange between high-temperature raw flue gas and low-temperature clean flue gas is usually realized through a flue gas-flue gas heat exchanger (GGH), and the effect of heating the clean flue gas is realized.
The heat exchanger is an important component of chemical equipment, and the reasonable selection of the material of the heat exchanger can not only avoid the corrosion of the equipment, but also reduce the investment cost of the equipment. At present, the most widely applied GGHs comprise 2 types of rotary type GGHs and shell-and-tube type GGHs, the rotary type GGH heat exchange element adopts an enamel material (a composite material which is formed by melting and condensing an inorganic vitreous material on a base metal and firmly combining the inorganic vitreous material with the metal), the material has the characteristics of strong temperature adaptability, corrosion resistance, difficulty in ash blockage, convenience in cleaning and the like, and the rotary type GGH heat exchange element is widely applied to the thermal power industry, but the rotary type GGH heat exchange element also has the problems of corrosion, easiness in thermal shock peeling of enamel, complexity in moving parts, high failure rate and the like in the application process.
The polymer coating in the surface coating protection technology is a new material, has the advantages of excellent mechanical property, corrosion resistance, design plasticity and the like, and becomes an effective substitute of a metal-based protection coating. The polymer coating can provide a physical barrier at the interface of the metal and the corrosive medium, and can play a role in effectively shielding the corrosive medium. However, gaps often exist among polymer molecular chains, and the coating can form defects such as cracks, bubbles, micropores and the like in the preparation process, so that the protection life of the coating is reduced to a certain extent. The nanometer filler is added into a polymer system, so that the defects of the polymer can be compensated, the compactness of the polymer is obviously improved, and the overall mechanical strength, the thermal stability and the corrosion resistance of a polymer matrix are improved.
Carbon nanomaterials have become one of the popular coating fillers at present. Has mild chemical stability, various electrical conductivity and special thermal conductivity, and has revolutionized the field of material science and technology. The carbon nano material is applied to a plurality of industrial fields due to different shapes and multi-dimensional structures, the fullerene has a defect-free cage-shaped structure, and the high-efficiency self-lubricating property of the fullerene can improve the compatibility between the filler and the polymer. The carbon nano tube has unique conductive characteristics, and has metallic and semiconductor characteristics, a honeycomb conductive network can be formed in the coating, and the coating is endowed with excellent electronic shielding performance. The graphene has a unique lamellar structure, and the corrosion prevention effect of the coating can be improved by prolonging the corrosion path, so that the coating has more excellent shielding performance. The spiral carbon nanotube is a carbon nanotube which is bent and surrounded to form a spiral linear structure. In addition to having other carbon material characteristics; the chiral material has excellent physical and chemical properties due to the unique three-dimensional spiral morphology and the unique chiral structure, and is always a hot spot focused by advanced science and technology and international new materials in all countries in the world.
Based on the above, the method for preparing the nano coating on the inner wall of the incinerator is provided, so that the defects of the existing device can be overcome.
Disclosure of Invention
The invention aims to provide a preparation method of a nano coating on the inner wall of an incinerator, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a nano coating on the inner wall of an incinerator comprises the following steps:
the method comprises the following steps: obtaining raw materials, namely 35-58% of polyarylether resin with a heteronaphthalene biphenyl structure, 1-4% of dispersing agent, 0.3-0.8% of defoaming agent, 2-8% of spiral carbon nano tube, 1-3% of meteorological silica, 3-7% of hexagonal boron nitride, 5-7% of ceramic powder, 8-15% of filler and 13-23% of solvent;
step two: the preparation method comprises the steps of obtaining a coating, adding the polyarylether resin with the heteronaphthalene biphenyl structure, a dispersing agent and a defoaming agent into a dispersion cylinder, uniformly stirring, adding the spiral carbon nanotube, the meteorological silica, the hexagonal boron nitride, the ceramic powder and the filler under the stirring state, dispersing at a high speed for 15-30min, connecting a sand mill, grinding to the fineness of less than 20 microns, transferring into a paint mixing kettle, adding a medium solvent, stirring at a high speed for 10-15min, stirring to a uniform state, adjusting the viscosity, and filtering after the detection performance of a finished product is qualified;
step three: and (3) preparing a coating, namely spraying the product concentration adjusting mass in the step two in a spraying state on the inner wall of an incinerator, drying the surface of the product for 30 minutes after the spraying is finished, placing the product in an oven at 180 ℃ for drying for 15 minutes, then placing the product in an oven at 240 ℃ for drying for 60 minutes, finally placing the product in an oven at 280 ℃ for drying for 15 minutes, taking out the product, and recovering the product to the room temperature to obtain the target nano coating.
On the basis of the technical scheme, the invention also provides the following optional technical scheme:
in one alternative: the dispersant is selected from controlled radical type dispersants.
In one alternative: the solvent is one or more selected from N-methyl pyrrolidone and dimethylacetamide.
In one alternative: and step two, obtaining the coating, namely adding the polyarylether resin with the heteronaphthalene biphenyl structure, the dispersing agent and the defoaming agent into a dispersing cylinder, uniformly stirring, adding the spiral carbon nano tube, the meteorological silica, the hexagonal boron nitride, the ceramic powder and the filler under the stirring state, dispersing for 20min at a high speed, connecting a sand mill, grinding until the fineness is below 20 mu m, transferring into a paint mixing kettle, adding the auxiliary agent, stirring for 12min at a medium speed, stirring to a uniform state, adjusting the viscosity, and filtering after the detection performance of a finished product is qualified.
Compared with the prior art, the invention has the following beneficial effects:
the polyaryletherketone nitrile containing the heteronaphthalene biphenyl structure is used as a main film forming substance, the spiral carbon nano tube is used as a functional filler, and a proper dispersing agent, a defoaming agent and the like are screened, so that the high-performance paint with high cost performance, high temperature resistance and hydrofluoric acid resistance is obtained. The product is mainly used for coating reaction towers, dust collectors, washing towers, flue gas pipelines and other parts of waste incineration power plants. The paint film has excellent adhesive force on materials such as steel, iron, aluminum, PVE and the like, and also has long-term high temperature resistance, hydrofluoric acid resistance, mixed acid resistance, excellent corrosion resistance and wear resistance. Most importantly, the product takes organic matters as film forming substances, and the problems of pulverization, poor wear resistance and the like can not occur.
Drawings
FIG. 1 is a flow chart of the preparation of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
In one embodiment, as shown in fig. 1, a method for preparing a nano-coating on the inner wall of an incinerator comprises the following steps:
the method comprises the following steps: the raw materials are obtained according to the following components by mass: 48% of a polyarylether resin with a heteronaphthalene biphenyl structure, 2.5% of a dispersing agent, 0.6% of a defoaming agent, 6% of a helical carbon nanotube, 2% of meteorological silica, 5% of hexagonal boron nitride, 6% of ceramic powder, 12% of a filler and 17.9% of a solvent;
the dispersant is of various types, mainly including anionic type, cationic type, nonionic type, amphoteric type, electric neutral type, high molecular type, controlled radical type and the like; compatibility tests show that anions, cations and amphiprotic types are separated out to different degrees, the compatibility of the polymer type and the controlled free radical type is good, the molecular weight distribution of the controlled free radical type is more concentrated, the anchoring groups are more concentrated, and the efficiency is higher. The product selects a controlled free radical type dispersant;
the functional filler (according to actual conditions, the selection of the functional filler is mainly considered from the performances of hydrofluoric acid resistance, high temperature resistance, wear resistance and the like) is mainly selected from hexagonal boron nitride, a carbon nano material, calcined kaolin, precipitated barium sulfate and talcum powder;
the hexagonal boron nitride can improve the high temperature resistance and the acid resistance of the coating, the calcined kaolin can improve the film forming property and the anti-sagging property of the coating, the talcum powder can improve the anti-sagging property and the anti-settling property of the coating, and the precipitated barium sulfate can improve the hardness and the wear resistance of the coating;
the solvent is selected from N-methyl pyrrolidone and dimethyl acetamide; the diluent is selected from isobutanol, n-butanol and xylene. Selecting a proper proportion to establish a good volatilization gradient;
the initial adhesion of the hetahaphenant polyarylether resin is poor, and needs to be improved by a substrate wetting agent or other types of resins. The heteronaphthalene biphenyl polyarylether resin is spliced with bisphenol A type or bisphenol F type epoxy resin, and a base material wetting agent with good compatibility is used for effectively solving the problem of poor initial adhesion of the heteronaphthalene biphenyl polyarylether resin;
step two: the preparation method comprises the steps of obtaining a coating, adding the phthalazinone polyarylether resin, the epoxy resin, the solvent and the auxiliary agent into a dispersion cylinder, uniformly stirring, sequentially adding the functional filler, dispersing at a high speed for 15-30min, connecting a sand mill, grinding to a fineness of below 20 mu m, transferring into a paint mixing kettle, adding the auxiliary agent, stirring at a medium speed for 10-15min, stirring to a uniform state, adjusting the viscosity, and filtering after the detection performance of a finished product is qualified;
step three: and (3) preparing a coating, namely spraying the product concentration adjusting mass in the step two in a spraying state on the inner wall of an incinerator, drying the surface of the product for 30 minutes after the spraying is finished, placing the product in an oven at 180 ℃ for drying for 15 minutes, then placing the product in an oven at 240 ℃ for drying for 60 minutes, finally placing the product in an oven at 280 ℃ for drying for 15 minutes, taking out the product, and recovering the product to the room temperature to obtain the target nano coating.
Experimental results of samples (the above coatings were applied to panels to obtain corresponding coatings, and then their properties were tested by a number of experiments):
the energy companies of Huaguangaokou and Shenzhen select polyaryletherketone nitrile containing a heteronaphthalene biphenyl structure as a main film forming substance, spiral carbon nanotubes as functional fillers, and proper dispersing agents, defoaming agents and the like are screened, so that the high-performance coating which is high in cost performance, high in temperature resistance and resistant to hydrofluoric acid is obtained. The product is mainly used for coating reaction towers, dust collectors, washing towers, flue gas pipelines and other parts of waste incineration power plants. The paint film has excellent adhesive force on materials such as steel, iron, aluminum, PVE and the like, and also has long-term high temperature resistance, hydrofluoric acid resistance, mixed acid resistance, excellent corrosion resistance and wear resistance. Especially, the special coating for the garbage incinerator has stable performance, can resist strong acid and strong alkali in a high-temperature environment of 200 ℃ for a long time, can resist the corrosion of hydrofluoric acid, and has convenient construction and maintenance and high cost performance. The corrosion-resistant coating can meet the working environment with complex corrosion conditions under high-temperature conditions, and has the characteristics of convenient construction, high cost performance and wide market popularization prospect;
compared with the existing film forming material, the polyarylether resin containing the heteronaphthalene biphenyl structure has excellent comprehensive performance, a series of excellent comprehensive performances such as high heat-resistant grade, good thermal stability, strong mechanical property, excellent electrical property, good size stability, corrosion resistance, irradiation resistance, non-combustibility and the like, and is an ideal film forming material for the high-temperature-resistant and strong-acid-corrosion-resistant coating.
When the naphthalene biphenyl polyarylether resin is used alone, the initial adhesion is poor, and when the naphthalene biphenyl polyarylether resin is used together with epoxy resin, the initial adhesion of a coating can be improved, and the adhesion between the coating and the surface of a base material plays a crucial role in corrosion prevention; the paint film adhesive force of the product is improved by matching with a proper amount of base material wetting agent and adhesion promoter, and the performance requirement of the product is met;
the carbon nano-material mainly comprises graphene, a single-walled nanotube, a multi-walled nanotube, a spiral carbon nanotube and the like. As can be seen from the table II, the addition of the carbon nano functional filler has a large influence on the performance of the coating, the spiral carbon nano tube can be added to 12%, and after the spiral carbon nano tube is uniformly dispersed, the viscosity of the coating is moderate, so that the coating is suitable for construction. Under a microscope, the planed surface graph of the coating is high in compactness, and the wear resistance and the high temperature resistance of the coating are obviously improved. The spiral carbon nano tube can improve the wear resistance and high temperature resistance of the coating.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (5)
1. The preparation method of the nanometer coating on the inner wall of the incinerator is characterized by comprising the following steps:
the method comprises the following steps: the raw materials are obtained according to the following components by mass: 35-58% of a polyarylether resin with a heteronaphthalene biphenyl structure, 1-4% of a dispersing agent, 0.3-0.8% of a defoaming agent, 2-8% of a helical carbon nanotube, 1-3% of meteorological silica, 3-7% of hexagonal boron nitride, 5-7% of ceramic powder, 8-15% of a filler and 13-23% of a solvent;
step two: the preparation method comprises the steps of obtaining a coating, adding the polyarylether resin with the heteronaphthalene biphenyl structure, a dispersing agent and a defoaming agent into a dispersion cylinder, uniformly stirring, adding the spiral carbon nanotube, the meteorological silica, the hexagonal boron nitride, the ceramic powder and the filler under the stirring state, dispersing at a high speed for 15-30min, connecting a sand mill, grinding to the fineness of less than 20 microns, transferring into a paint mixing kettle, adding a medium solvent, stirring at a high speed for 10-15min, stirring to a uniform state, adjusting the viscosity, and filtering after the detection performance of a finished product is qualified;
step three: and (3) preparing a coating, namely spraying the product concentration adjusting mass in the step two in a spraying state on the inner wall of an incinerator, drying the surface of the product for 30 minutes after the spraying is finished, placing the product in an oven at 180 ℃ for drying for 15 minutes, then placing the product in an oven at 240 ℃ for drying for 60 minutes, finally placing the product in an oven at 280 ℃ for drying for 15 minutes, taking out the product, and recovering the product to the room temperature to obtain the target nano coating.
2. The method for preparing the nano coating on the inner wall of the incinerator according to claim 1, wherein the nano coating comprises the following raw materials in percentage by mass: 48 percent of polyarylether resin with a heteronaphthalene biphenyl structure, 2.5 percent of dispersant, 0.6 percent of defoamer, 6 percent of spiral carbon nano tube, 2 percent of meteorological silica, 5 percent of hexagonal boron nitride, 6 percent of ceramic powder, 12 percent of filler and 17.9 percent of solvent.
3. The method for preparing the nanocoating for the inner wall of the incinerator according to claim 1, wherein the dispersant is selected from a controlled radical type dispersant.
4. The method for preparing the nano coating on the inner wall of the incinerator according to claim 1, wherein the solvent is one or more selected from N-methyl pyrrolidone and dimethylacetamide.
5. The method for preparing the nanometer coating on the inner wall of the incinerator according to claim 1, characterized in that in the second step, the coating is obtained, the polyarylether resin with the heteronaphthalene biphenyl structure, the dispersing agent and the defoaming agent are added into a dispersion cylinder and uniformly stirred, the spiral carbon nanotube, the meteorological silica, the hexagonal boron nitride, the ceramic powder and the filler are added in the dispersion cylinder in a stirring state, the mixture is dispersed at a high speed for 20min, a sand mill is connected and ground to the fineness of less than 20 μm, the mixture is transferred into a paint mixing kettle, the auxiliary agent is added, the mixture is stirred at a medium speed for 12min, the mixture is stirred to a uniform state, the viscosity is adjusted, and the product is filtered after the detection performance is qualified.
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