CN115925438B - Preparation method of high-temperature-resistant corrosion-resistant composite coating for RTO - Google Patents
Preparation method of high-temperature-resistant corrosion-resistant composite coating for RTO Download PDFInfo
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Abstract
The invention discloses a preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO, which comprises the steps of spraying an acid-base-resistant modified polymer on the surface of the inner wall of RTO equipment at high pressure to form an acid-base-resistant modified polymer coating, air-drying for 20-40 min, brushing a heat-insulating cementing material to form a heat-insulating cementing coating, and naturally air-drying to obtain the high-temperature-resistant corrosion-resistant composite coating for RTO; the preparation method of the acid-base resistant modified polymer comprises the following steps: mixing the resin adhesive coating liquid, the fiber filling liquid and the curing agent, and heating and stirring to obtain an acid and alkali resistant modified polymer; the preparation method of the heat-insulating cementing material comprises the following steps: mixing metakaolin, fly ash and an alkali excitant or mixing metakaolin and an alkali excitant to obtain gel precursor slurry; and adding a foaming agent, and stirring to obtain the self-foaming heat-insulating cementing material. The composite material prepared by the invention can be molded at low temperature, and when the composite material is brushed on the surface of RTO equipment containing chlorine VOCs, the problem of corrosion to a gas cabin and an exhaust pipeline caused by cooling and condensation of HCl which is a byproduct of the RTO process is successfully solved.
Description
Technical Field
The invention belongs to the technical field of materials, and relates to a coating, in particular to a preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO.
Background
The environmental protection problem brought by the rapid development of industry is the focus of attention of government and related departments in recent years, the total emission amount of VOCs (volatile organic compounds) which are important pollutants in industrial sources is 481.7 ten thousand tons/year, wherein dichloromethane which is called as a universal solvent is one of the most widely applied solvents in the important industry, and the ecological environment department is used for mainly controlling new pollutants; in addition, chlorine-containing VOCs such as trichloroethylene and chlorobenzene are also commonly used, and a great deal of volatile waste gas is inevitably generated in the using process, so that the environment is seriously influenced. The process except combustion is difficult to treat efficiently, and the chlorinated hydrocarbon is treated by the combustion method to generate new pollutants such as dioxin, hydrogen chloride and the like, wherein the hydrogen chloride forms hydrochloric acid after being contacted with water, so that the purification efficiency is reduced due to serious corrosion effect on a regenerative thermal incinerator (RTO), and the maintenance cost of enterprises is increased, and the potential safety hazard is also caused.
Therefore, how to protect RTO equipment from corrosion is a difficult and urgent need in the industry.
Disclosure of Invention
The invention provides a preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO, which aims to overcome the defects of the prior art.
In order to achieve the above purpose, the invention provides a preparation method of a high temperature resistant and corrosion resistant composite coating for RTO, which has the following characteristics: spraying acid-alkali resistant modified polymer on the surface of the inner wall of RTO equipment at high pressure to form an acid-alkali resistant modified polymer coating, air-drying for 20-40 min, brushing a heat insulation cementing material to form a heat insulation cementing coating, naturally air-drying, and standing for 48 hours to obtain the high-temperature-resistant corrosion-resistant composite coating for RTO;
the preparation method of the acid and alkali resistant modified polymer comprises the following steps:
heating and mixing the polymethyldisiloxane, the chlorosilane, the water, the ethanol and the hydrochloric acid, and adding the tetraethyl orthosilicate to obtain the organic silicon resin; mixing organic silicon resin with bisphenol A epoxy resin, and heating to obtain resin adhesive coating liquid; step two, mixing inorganic ceramic nano fibers, silica sol and polyvinyl alcohol solution, and heating and stirring to obtain fiber filling liquid; step three, preparing a curing agent; step four, mixing the resin adhesive coating liquid obtained in the step one, the fiber filling liquid obtained in the step two and the curing agent obtained in the step three, and heating and stirring to obtain an acid and alkali resistant modified polymer;
the preparation method of the heat-insulating cementing material comprises the following steps: mixing metakaolin, fly ash and an alkali excitant or mixing metakaolin and an alkali excitant to obtain gel precursor slurry; and adding a foaming agent, and stirring to obtain the self-foaming heat-insulating cementing material.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: wherein the spraying thickness of the modified polymer coating is 5-10 mm; the sprayed thickness of the thermal insulation gel coating is 10-15 mm.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: in the preparation method of the acid and alkali resistant modified polymer, the specific method in the first step is as follows: stirring the polymethyldisiloxane, the chlorosilane, the water, the ethanol and the hydrochloric acid for 3 hours at the temperature of 70 ℃ at the speed of 100-300 r/min, slowly adding the tetraethyl orthosilicate in the process, and extracting with toluene to obtain the organic silicon resin; mixing the synthesized organic silicon resin with bisphenol A epoxy resin, and stirring at the temperature of 60 ℃ for 60 min at the speed of 100-300 r/min to obtain resin adhesive coating liquid; the mass ratio of the polymethyl disiloxane to the chlorosilane to the water to the ethanol to the hydrochloric acid to the tetraethyl orthosilicate is 10-15:5-10:15:10:2:20; the mass ratio of the organic silicon resin to the bisphenol A type epoxy resin is 70-80:20-30.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: wherein the polymethyldisiloxane is one or more of dimethyldisiloxane, 1, 3-tetramethyldisiloxane and hexamethyldisiloxane; the chlorosilane is one or more of methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilane and diphenyldichlorosilane.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: in the preparation method of the acid and alkali resistant modified polymer, the specific method of the second step is as follows: mixing inorganic ceramic nano fibers, silica sol and polyvinyl alcohol solution, placing the mixture into a high-temperature reaction kettle, stirring the mixture at 100 ℃ for 1 h, and naturally cooling the mixture to room temperature to obtain fiber filling liquid; the mass fraction of the polyvinyl alcohol solution is 8-15%, and the mass ratio of the inorganic ceramic nanofiber to the silica sol to the polyvinyl alcohol solution is 30-60:20-60:10-25.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: wherein, the inorganic ceramic nanofiber is one or more of inorganic silicon carbide nanofiber, inorganic boron nitride nanofiber and silicon nitride nanofiber;
the silica sol is an aqueous solution of nano silicon dioxide, aluminum oxide and sodium oxide, wherein the mass fraction of the nano silicon dioxide is 20% -35%, the mass fraction of the aluminum oxide is 5% -10%, and the mass fraction of the sodium oxide is 0.06% -0.1%.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: in the preparation method of the acid and alkali resistant modified polymer, the specific method in the step three is as follows: stirring aliphatic polyamine at a rotation speed of 50-200 r/min at 80 ℃ for 1-2 h, adding ammonia water to adjust pH to 9, naturally cooling, adding isophorone diamine, and stirring at 50-100 ℃ for 200-500 r/min for 1 h to obtain a curing agent; the mass ratio of the aliphatic polyamine to the isophorone diamine is 1-3:1.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: wherein the aliphatic polyamine is one or more of diethylenetriamine or triethylenetetramine.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: in the preparation method of the acid and alkali resistant modified polymer, the specific method in the step four is as follows: mixing the resin adhesive coating liquid obtained in the step one, the fiber filling liquid obtained in the step two and the curing agent obtained in the step three according to the mass ratio of 3:6:1, and stirring at 50 ℃ for 30 min at 300-500 r/min to obtain the acid and alkali resistant modified polymer.
Further, the invention provides a preparation method of the high-temperature-resistant corrosion-resistant composite coating for RTO, which can also have the following characteristics: the concrete preparation method of the heat-insulating cementing material comprises the following steps: uniformly mixing metakaolin, fly ash and alkali excitant, and stirring for 30-60 minutes at 500-1000 r/min to obtain gel precursor slurry; slowly adding the foaming agent into the gel precursor slurry while stirring at a rotating speed of 1000-1500 r/min, and stirring for 5-10 min to obtain the self-foaming heat-insulating cementing material;
in the metakaolin, siO 2 Has a specific gravity of 46-55%, al 2 O 3 Has a specific gravity of 40-42%, and Al 2 O 3 With SiO 2 Is 0.85; in the fly ash, the particle with the particle diameter smaller than 10 mu m accounts for 50-55%, the particle with the particle diameter of 10-50 mu m accounts for 30-35%, and Al 2 O 3 Has a specific gravity of greater than 30%, siO 2 Has a specific gravity of greater than 50%; the alkali-activated agent is prepared by mixing sodium silicate and sodium hydroxide in a mass ratio of 5:1; the mass ratio of the metakaolin to the fly ash to the alkali excitant is 35-60:0-25:55-75; the foaming agent consists of polyacrylonitrile fiber hydrogen peroxide mixed solution, sodium dodecyl sulfate and calcium stearate; the mass fraction of the polyacrylonitrile fiber in the polyacrylonitrile fiber hydrogen peroxide mixed solution is 30-40%; the mass ratio of the polyacrylonitrile fiber hydrogen peroxide mixed solution, the sodium dodecyl sulfate and the calcium stearate is 2-5:1:1.
The invention has the beneficial effects that: the invention provides a preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO (resin transfer coating) by coupling porous thermal insulation cementing materials with polymer resin, wherein the thermal insulation cementing materials have better hardness and lower heat conductivity, and after the flowable polymer resin carries out pore canal modification and filling on the thermal insulation cementing materials, the thermal insulation gel and the modified polymer resin complement each other, so that the heat resistance and the corrosion resistance are greatly improved.
Specifically, after brushing the acid-base resistant modified polymer, brushing the porous heat-insulating cementing material when the acid-base resistant modified polymer is not solidified, at the joint of the acid-base resistant modified polymer coating and the heat-insulating cementing material, the polymer resin contacts aluminosilicate in the heat-insulating cementing material due to the fluidity of the acid-base modified polymer, under the action of an alkali-exciting agent, si-O bonds and Al-O bonds in Si-Al sol in the polymer resin and Si-O-Al bonds in the aluminosilicate are broken, and a three-dimensional molecular chain structure is formed under the action of the alkali-exciting agent, so that a connecting layer is formed, and the two sides of the connecting layer are the resin layer and the porous heat-insulating layer (shown in figure 4).
The heat insulation layer has the main advantages of absorbing most of heat in RTO and playing a role of an air flow distributor, so that high-concentration hot HCl is changed into low-concentration low-temperature HCl, and the resin layer is effectively protected; the intermediate connecting layer is a connecting layer of resin and porous cementing material, the resin has fluidity, and when the resin contacts with the porous cementing material, the resin is infiltrated into the pore canal under the combined action of capillary force and gravity, so that the pore structure of the porous cementing material is effectively modified and closed, the dissipation of HCl is prevented, and the problem that RTO equipment is corroded is avoided (as shown in figure 5). In addition, the resin and the corresponding modified group contain Si-O and Al-O bonds, so that the resin and the porous cementing material can form a chemical bond with a three-dimensional structure of-Si-O-Al-Si-O under the action of an alkali excitant, and the porous cementing material and a compact resin bond can also form a good rivet embedding effect, so that the porous cementing material and the resin are not easy to separate, and the strength of the composite coating is good. Meanwhile, the compact resin can prevent HCl from escaping, has good fluidity and viscosity, can enable the composite coating to be well adhered to RTO equipment, has good practicability and can be suitable for surface modification of RTO equipment in various shapes.
Therefore, on one hand, the main body material adopted by the invention is a cementing material, is a heat insulation material with high temperature resistance, high mechanical strength, abrasion resistance and low heat conductivity, and can play a good role in protecting RTO pipelines and polymer resins. On the other hand, the acid and alkali resistant modified polymer is used as a pore canal filler and a binder of the cementing material, so that the dissipation of acid in an RTO process is effectively reduced, the service life of RTO equipment is prolonged, the maintenance cost is reduced, and in addition, the fluidity and adjustable viscosity of the acid and alkali resistant modified polymer resin can greatly increase the application scene of the material.
Drawings
FIG. 1 is an electron microscope image (a) of a heat-insulating cementing material, an electron microscope image (b) of a connecting layer of a high-temperature-resistant corrosion-resistant composite coating prepared by modifying the heat-insulating cementing material with an acid-base-resistant modified polymer, and an electron microscope image (c) of an inorganic ceramic nanofiber used in the acid-base-resistant modified polymer;
FIG. 2 is a graph of acid corrosion resistance results of a high temperature resistant corrosion resistant composite coating for RTO of the present invention;
FIG. 3 is a graph of the thermal stability of the high temperature and corrosion resistant composite coating for RTO of the present invention under an oxygen atmosphere;
FIG. 4 is a diagram of a mechanism for preparing a high temperature resistant corrosion resistant composite coating for RTO according to the present invention;
FIG. 5 is a schematic diagram of the high temperature and corrosion resistant composite coating for RTO according to the present invention.
Description of the embodiments
The invention is further illustrated below with reference to specific examples.
Examples
The embodiment provides a preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO, which comprises the following steps: firstly, spraying acid and alkali resistant modified polymer on the inner wall surface of RTO equipment at high pressure to form an acid and alkali resistant modified polymer coating of 5 mm, air-drying for 30 min, brushing a heat insulation cementing material to form a heat insulation cementing coating of 15 mm, naturally air-drying, and standing for 48 hours to obtain the high-temperature resistant and corrosion resistant composite coating for RTO.
The preparation method of the acid and alkali resistant modified polymer comprises the following steps: step one, 10 parts (by mass, the same applies below) of hexamethyldisiloxane, 10 parts of methyltrichlorosilane, 15 parts of water, 10 parts of ethanol and 2 parts of hydrochloric acid are stirred at the speed of 100 r/min for 3 hours at the temperature of 70 ℃, 20 parts of tetraethyl orthosilicate is slowly added in the process, and toluene is used for extraction to obtain organic silicon resin; 70 parts of synthetic organic silicon resin and 20 parts of bisphenol A type epoxy resin are mixed, and stirred at a temperature of 60 ℃ for 60 minutes at a speed of 100 r/min to prepare a resin adhesive coating liquid. Step two, mixing 30 parts of inorganic boron nitride nanofiber, 20 parts of silica sol (aqueous solution of nano silicon dioxide (mass fraction 20%), alumina (mass fraction 5%) and sodium oxide (mass fraction 0.06%) and 10 parts of 8% polyvinyl alcohol solution, putting the mixture into a high-temperature reaction kettle, stirring the mixture at 100 ℃ for 1 h, and naturally cooling the mixture to room temperature to obtain fiber filling liquid. Step three, stirring 1 part of diethylenetriamine at the rotation speed of 50 r/min at the temperature of 80 ℃ for 1 h, adding ammonia water to adjust the pH value to 9, naturally cooling, adding 1 part of isophorone diamine into the mixture, and stirring at the temperature of 50 ℃ at the speed of 200 r/min for 1 h to prepare the curing agent. And step four, mixing the resin adhesive coating liquid obtained in the step one, the fiber filler liquid obtained in the step two and the curing agent obtained in the step three according to the mass ratio of 3:6:1, and stirring at the temperature of 50 ℃ for 30 min at the speed of 300r/min to obtain the acid and alkali resistant modified polymer.
The preparation method of the high-strength porous heat-insulating cementing material comprises the following steps: 35 parts of metakaolin (SiO therein 2 Has a specific gravity of 46-55%, al 2 O 3 Has a specific gravity of 40-42%, and Al 2 O 3 With SiO 2 Uniformly mixing the mixture of 0.85 mass ratio), 55 parts of alkali-activator (prepared by mixing sodium silicate and sodium hydroxide in a mass ratio of 5:1), and stirring for 30 minutes at 500r/min to obtain gel precursor slurry; and then slowly adding a foaming agent formed by 2 parts of polyacrylonitrile fiber hydrogen peroxide mixed solution (the mass fraction of the polyacrylonitrile fiber is 40%), 1 part of sodium dodecyl sulfate and 1 part of calcium stearate into the gel precursor slurry under the stirring condition at the rotating speed of 1000r/min, and stirring for 5min to obtain the self-foaming heat-insulating cementing material.
An electron microscopic view of the heat-insulating cementing material is shown in a figure 1 a, an electron microscopic view of a connecting layer (a joint between the acid-resistant and alkali-resistant modified polymer coating and the heat-insulating cementing coating) in the high-temperature-resistant and corrosion-resistant composite coating after the acid-resistant and alkali-resistant modified polymer is used for decorating the heat-insulating cementing material is shown in a figure 1 b, and an electron microscopic view of inorganic ceramic nano fibers used in the acid-resistant and alkali-resistant modified polymer is shown in a figure 1 c. Comparing a and b in fig. 1, it can be seen that the acid and alkali resistant modified polymer is uniformly filled in the pores of the insulating cement.
Examples
The embodiment provides a preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO, which comprises the following steps: acid and alkali resistant modified polymer is sprayed on the inner wall surface of RTO equipment at high pressure to form an acid and alkali resistant modified polymer coating of 8 mm, after air drying for 20 min, a heat insulation cementing material is brushed to form a heat insulation cementing coating of 12 mm, and after natural air drying, the heat insulation cementing material is left for 48 hours, thus obtaining the high temperature resistant and corrosion resistant composite coating for RTO.
The preparation method of the acid and alkali resistant modified polymer comprises the following steps: step one, stirring 15 parts of a mixture of 1, 3-tetramethyl disiloxane and hexamethyldisiloxane, 7 parts of a mixture of methyltrichlorosilane and phenyltrichlorosilane, 15 parts of water, 10 parts of ethanol and 2 parts of hydrochloric acid at 70 ℃ for 3 hours at a speed of 200 r/min, slowly adding 20 parts of tetraethyl orthosilicate in the process, and extracting with toluene to obtain the organic silicon resin; 75 parts of synthetic silicone resin and 25 parts of bisphenol A type epoxy resin are mixed, and stirred at 200 r/min for 60 min at 60 ℃ to prepare resin adhesive coating liquid. Step two, 45 parts of inorganic silicon nitride nanofiber, 40 parts of silica sol (aqueous solution of nano silicon dioxide (mass fraction of 35%), alumina (mass fraction of 10%) and sodium oxide (mass fraction of 0.1%) and 17 parts of polyvinyl alcohol solution with mass fraction of 15% are mixed and placed into a high-temperature reaction kettle, stirred at 100 ℃ for 1 h, and then naturally cooled to room temperature to obtain fiber filling liquid. Step three, stirring 2 parts of diethylenetriamine at the rotation speed of 200 r/min for 2 hours at the temperature of 80 ℃, adding ammonia water to adjust the pH value to 9, naturally cooling, adding 1 part of isophorone diamine into the mixture, and stirring 1 h at the temperature of 100 ℃ at the speed of 500r/min to prepare the curing agent. And step four, mixing the resin adhesive coating liquid obtained in the step one, the fiber filler liquid obtained in the step two and the curing agent obtained in the step three according to the mass ratio of 3:6:1, and stirring at the temperature of 50 ℃ for 30 min at the speed of 300r/min to obtain the acid and alkali resistant modified polymer.
The preparation method of the high-strength porous heat-insulating cementing material comprises the following steps: 60 parts of metakaolin (SiO therein 2 Has a specific gravity of 46-55%, al 2 O 3 Has a specific gravity of 40-42%, and Al 2 O 3 With SiO 2 0.85), 25 parts of fly ash (particle with particle diameter smaller than 10 μm accounts for 50-55%, particle with particle diameter of 10-50 μm accounts for 30-35%, and Al 2 O 3 Has a specific gravity of greater than 30%, siO 2 The specific gravity of (2) is greater than 50 percent), 75 parts of alkali-activator (prepared by mixing sodium silicate and sodium hydroxide according to the mass ratio of 5:1) are uniformly mixed, and the mixture is stirred for 60 minutes at 1000r/min to obtain gel precursor slurry; and then slowly adding a foaming agent formed by 5 parts of polyacrylonitrile fiber hydrogen peroxide mixed solution (the mass fraction of the polyacrylonitrile fiber is 30%), 1 part of sodium dodecyl sulfate and 1 part of calcium stearate into the gel precursor slurry under the rotating speed of 1500r/min while stirring, and stirring for 10min to obtain the self-foaming heat-insulating cementing material.
Examples
The embodiment provides a preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO, which comprises the following steps: firstly, spraying acid and alkali resistant modified polymer on the surface of the inner wall of RTO equipment at high pressure to form an acid and alkali resistant modified polymer coating of 5 mm, air-drying for 40 min, brushing a heat insulation cementing material to form a heat insulation cementing coating of 15 mm, naturally air-drying, and standing for 48 hours to obtain the high-temperature resistant and corrosion resistant composite coating for RTO.
The preparation method of the acid and alkali resistant modified polymer comprises the following steps: step one, stirring 13 parts of 1, 3-tetramethyl disiloxane, 10 parts of methyltrichlorosilane, 15 parts of water, 10 parts of ethanol and 2 parts of hydrochloric acid at the temperature of 70 ℃ for 3 hours at the speed of 100 r/min, slowly adding 20 parts of tetraethyl orthosilicate in the process, and extracting with toluene to obtain organic silicon resin; 70 parts of synthetic organic silicon resin and 20 parts of bisphenol A type epoxy resin are mixed, and stirred at a temperature of 60 ℃ for 60 minutes at a speed of 100 r/min to prepare a resin adhesive coating liquid. Step two, 40 parts of inorganic silicon nitride nanofiber, inorganic boron nitride nanofiber, 50 parts of silica sol (aqueous solution of nano silicon dioxide (mass fraction 28%), alumina (mass fraction 8%) and sodium oxide (mass fraction 0.08%) and 13 parts of polyvinyl alcohol solution with mass fraction of 11% are mixed and placed into a high-temperature reaction kettle, stirred at 100 ℃ for 1 h, and then naturally cooled to room temperature to obtain fiber filling liquid. Step three, stirring 2 parts of diethylenetriamine at the rotating speed of 150 r/min for 1.5 hours at the temperature of 80 ℃, adding ammonia water to adjust the pH value to 9, naturally cooling, adding 1 part of isophorone diamine into the mixture, and stirring 1 h at the temperature of 75 ℃ at the speed of 300r/min to prepare the curing agent. And step four, mixing the resin adhesive coating liquid obtained in the step one, the fiber filler liquid obtained in the step two and the curing agent obtained in the step three according to the mass ratio of 3:6:1, and stirring at the temperature of 50 ℃ for 30 min at the speed of 300r/min to obtain the acid and alkali resistant modified polymer.
The preparation method of the high-strength porous heat-insulating cementing material comprises the following steps: 45 parts of metakaolin (SiO therein 2 Has a specific gravity of 46-55%, al 2 O 3 Has a specific gravity of 40-42%, and Al 2 O 3 With SiO 2 0.85), 15 parts of fly ash (particle with particle diameter smaller than 10 μm accounts for 50-55%, particle with particle diameter of 10-50 μm accounts for 30-35%, and Al 2 O 3 Has a specific gravity of greater than 30%, siO 2 The specific gravity of (2) is greater than 50 percent), 65 parts of alkali-activator (prepared by mixing sodium silicate and sodium hydroxide according to the mass ratio of 5:1) are uniformly mixed, and stirred for 45 minutes at 800r/min to obtain gel precursor slurry; and then slowly adding a foaming agent formed by 4 parts of polyacrylonitrile fiber hydrogen peroxide mixed solution (the mass fraction of the polyacrylonitrile fiber is 35%), 1 part of sodium dodecyl sulfate and 1 part of calcium stearate into the gel precursor slurry under the rotation speed of 1300r/min while stirring, and stirring for 8min to obtain the self-foaming heat-insulating cementing material.
Acid corrosion resistance test was performed on the high temperature and corrosion resistant composite coating for RTO obtained in example 1: a clean A4 paper is placed on a clean and smooth glass plate, a layer of 5 mm acid-base resistant modified polymer coating prepared according to the steps of example 1 (five layers of coatings with the same size and length are sprayed on white paper at intervals) is sprayed on the glass plate, a 15 mm thermal insulation gel coating prepared according to the steps of example 1 is brushed after the glass plate is dried for 30 min, the A4 paper is taken off the glass plate after the glass plate is left to stand for 48 hours after natural drying, five composite coatings are placed on a heating plate and heated for respectively treating 1, 2, 3, 4 and 5h (the white paper surface is contacted with the heating plate, the process is safe), and the five composite coatings are placed on a universal material tester for strength test after cooling, and the result is shown in figure 2.
The high temperature resistant and corrosion resistant composite coating for RTO obtained in example 1 was subjected to a high temperature test: a clean A4 paper is placed on a clean and smooth glass plate, a layer of 5 mm acid-base resistant modified polymer coating prepared according to the steps in example 1 is sprayed firstly, a 15 mm thermal insulation gel coating prepared according to the steps in example 1 is brushed after air drying for 30 min, the A4 paper is taken off the glass plate after standing for 48 hours after natural air drying, a proper amount of composite coating is taken and put into a differential calorimeter, the heating temperature is between room temperature and 800 ℃, the atmosphere is oxygen, and the result is shown in figure 3.
As can be seen from fig. 2 and 3, the high-temperature-resistant corrosion-resistant composite coating for RTO provided by the invention has good high-temperature-resistant corrosion-resistant performance.
Claims (10)
1. A preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO is characterized by comprising the following steps:
spraying an acid-alkali resistant modified polymer on the surface of the inner wall of RTO equipment to form an acid-alkali resistant modified polymer coating, air-drying for 20-40 min, wherein the acid-alkali resistant modified polymer coating is not solidified, brushing a heat insulation cementing material to form a heat insulation cementing coating, and naturally air-drying to obtain the high-temperature-resistant corrosion-resistant composite coating for RTO;
the preparation method of the acid and alkali resistant modified polymer comprises the following steps:
heating and mixing the polymethyldisiloxane, the chlorosilane, the water, the ethanol and the hydrochloric acid, and adding the tetraethyl orthosilicate to obtain the organic silicon resin; mixing organic silicon resin with bisphenol A epoxy resin, and heating to obtain resin adhesive coating liquid;
step two, mixing inorganic ceramic nano fibers, silica sol and polyvinyl alcohol solution, and heating and stirring to obtain fiber filling liquid;
step three, preparing a curing agent;
step four, mixing the resin adhesive coating liquid obtained in the step one, the fiber filling liquid obtained in the step two and the curing agent obtained in the step three, and heating and stirring to obtain an acid and alkali resistant modified polymer;
the preparation method of the heat-insulating cementing material comprises the following steps: mixing metakaolin, fly ash and an alkali excitant or mixing metakaolin and an alkali excitant to obtain gel precursor slurry; and adding a foaming agent, and stirring to obtain the self-foaming heat-insulating cementing material.
2. The method for preparing the high-temperature-resistant corrosion-resistant composite coating for RTO according to claim 1, which is characterized in that:
wherein the spraying thickness of the modified polymer coating is 5-10 mm;
the sprayed thickness of the thermal insulation gel coating is 10-15 mm.
3. The method for preparing the high-temperature-resistant corrosion-resistant composite coating for RTO according to claim 1, which is characterized in that:
in the preparation method of the acid and alkali resistant modified polymer, the specific method in the first step is as follows: stirring the polymethyldisiloxane, the chlorosilane, the water, the ethanol and the hydrochloric acid for 3 hours at the temperature of 70 ℃ at the speed of 100-300 r/min, slowly adding the tetraethyl orthosilicate in the process, and extracting with toluene to obtain the organic silicon resin;
mixing the synthesized organic silicon resin with bisphenol A epoxy resin, and stirring at the temperature of 60 ℃ for 60 min at the speed of 100-300 r/min to obtain resin adhesive coating liquid;
the mass ratio of the polymethyl disiloxane to the chlorosilane to the water to the ethanol to the hydrochloric acid to the tetraethyl orthosilicate is 10-15:5-10:15:10:2:20;
the mass ratio of the organic silicon resin to the bisphenol A type epoxy resin is 70-80:20-30.
4. A method for preparing a high temperature resistant corrosion resistant composite coating for RTO according to claim 1 or 3, characterized in that:
wherein the polymethyldisiloxane is one or more of dimethyldisiloxane, 1, 3-tetramethyldisiloxane and hexamethyldisiloxane;
the chlorosilane is one or more of methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilane and diphenyldichlorosilane.
5. The method for preparing the high-temperature-resistant corrosion-resistant composite coating for RTO according to claim 1, which is characterized in that:
in the preparation method of the acid and alkali resistant modified polymer, the specific method of the second step is as follows: mixing inorganic ceramic nano fibers, silica sol and polyvinyl alcohol solution, stirring at 100 ℃ for 1 h, and naturally cooling to room temperature to obtain fiber filling liquid;
the mass fraction of the polyvinyl alcohol solution is 8-15%, and the mass ratio of the inorganic ceramic nanofiber to the silica sol to the polyvinyl alcohol solution is 30-60:20-60:10-25.
6. The method for preparing the high-temperature-resistant corrosion-resistant composite coating for RTO according to claim 1 or 5, which is characterized in that:
wherein, the inorganic ceramic nanofiber is one or more of inorganic silicon carbide nanofiber, inorganic boron nitride nanofiber and silicon nitride nanofiber;
the silica sol is an aqueous solution of nano silicon dioxide, aluminum oxide and sodium oxide, wherein the mass fraction of the nano silicon dioxide is 20% -35%, the mass fraction of the aluminum oxide is 5% -10%, and the mass fraction of the sodium oxide is 0.06% -0.1%.
7. The method for preparing the high-temperature-resistant corrosion-resistant composite coating for RTO according to claim 1, which is characterized in that:
in the preparation method of the acid and alkali resistant modified polymer, the specific method in the step three is as follows: stirring aliphatic polyamine at a rotation speed of 50-200 r/min at 80 ℃ for 1-2 h, adding ammonia water to adjust pH to 9, naturally cooling, adding isophorone diamine, and stirring at 50-100 ℃ for 200-500 r/min for 1 h to obtain a curing agent;
the mass ratio of the aliphatic polyamine to the isophorone diamine is 1-3:1.
8. The method for preparing the high-temperature-resistant corrosion-resistant composite coating for RTO according to claim 7, which is characterized in that:
wherein the aliphatic polyamine is one or more of diethylenetriamine or triethylenetetramine.
9. The method for preparing the high-temperature-resistant corrosion-resistant composite coating for RTO according to claim 1, which is characterized in that:
in the preparation method of the acid and alkali resistant modified polymer, the specific method in the step four is as follows: mixing the resin adhesive coating liquid obtained in the step one, the fiber filling liquid obtained in the step two and the curing agent obtained in the step three according to the mass ratio of 3:6:1, and stirring at 50 ℃ for 30 min at 300-500 r/min to obtain the acid and alkali resistant modified polymer.
10. The method for preparing the high-temperature-resistant corrosion-resistant composite coating for RTO according to claim 1, which is characterized in that:
the concrete preparation method of the heat-insulating cementing material comprises the following steps: uniformly mixing metakaolin, fly ash and alkali excitant, and stirring for 30-60 minutes at 500-1000 r/min to obtain gel precursor slurry; slowly adding the foaming agent into the gel precursor slurry while stirring at a rotating speed of 1000-1500 r/min, and stirring for 5-10 min to obtain the self-foaming heat-insulating cementing material;
in the metakaolin, siO 2 Has a specific gravity of 46-55%, al 2 O 3 Has a specific gravity of 40-42%, and Al 2 O 3 With SiO 2 Is 0.85;
in the fly ash, the particle with the particle diameter smaller than 10 mu m accounts for 50-55%, the particle with the particle diameter of 10-50 mu m accounts for 30-35%, and Al 2 O 3 Has a specific gravity of greater than 30%, siO 2 Has a specific gravity of greater than 50%;
the alkali-activated agent is prepared by mixing sodium silicate and sodium hydroxide in a mass ratio of 5:1;
the mass ratio of the metakaolin to the fly ash to the alkali excitant is 35-60:0-25:55-75;
the foaming agent consists of polyacrylonitrile fiber hydrogen peroxide mixed solution, sodium dodecyl sulfate and calcium stearate; the mass fraction of the polyacrylonitrile fiber in the polyacrylonitrile fiber hydrogen peroxide mixed solution is 30-40%; the mass ratio of the polyacrylonitrile fiber hydrogen peroxide mixed solution, the sodium dodecyl sulfate and the calcium stearate is 2-5:1:1.
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