CN115925438A - Preparation method of high-temperature-resistant corrosion-resistant composite coating for RTO (room temperature vulcanization) - Google Patents
Preparation method of high-temperature-resistant corrosion-resistant composite coating for RTO (room temperature vulcanization) Download PDFInfo
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Abstract
The invention discloses a preparation method of a high-temperature-resistant and corrosion-resistant composite coating for RTO, which comprises the steps of firstly 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, brushing a heat-insulating cementing material after air drying for 20-40min to form a heat-insulating cementing coating, and obtaining the high-temperature-resistant and corrosion-resistant composite coating for RTO after natural air drying; the preparation method of the acid and alkali resistant modified polymer comprises the following steps: mixing the resin adhesive coating liquid, the fiber filler 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 activator or mixing metakaolin and an alkali activator 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 corrosion problem of gas bins and exhaust pipelines caused by cooling and condensation of HCl (hydrochloric acid) which is a byproduct of the RTO process is successfully solved.
Description
Technical Field
The invention belongs to the technical field of materials, relates to a coating, and particularly relates to a preparation method of a high-temperature-resistant and corrosion-resistant composite coating for RTO.
Background
The environmental protection problem brought by the rapid development of the industry is the focus of attention of governments 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 universal solvent is one of the solvents which are most widely applied in the important industry and is taken as a new pollutant which is mainly controlled by the ecological environment; in addition, chlorinated VOCs (volatile organic compounds) such as trichloroethylene, chlorobenzene and the like are also commonly used, and a large amount of volatile organic compounds are inevitably volatilized into waste gas in the using process, so that the environment is seriously influenced. The processes except combustion are difficult to treat efficiently, and the chlorinated hydrocarbon is treated by a combustion method to generate gases such as new pollutants of dioxin, hydrogen chloride and the like, wherein the hydrogen chloride is contacted with water to form hydrochloric acid, so that a heat accumulating type thermal power incinerator (RTO) is severely corroded to reduce the purification efficiency, the maintenance cost of an enterprise is increased, and a large potential safety hazard is caused.
Therefore, how to carry out anticorrosion protection on RTO equipment becomes a difficult problem and urgent need of the industry.
Disclosure of Invention
The invention provides a preparation method of a high-temperature-resistant and corrosion-resistant composite coating for RTO (room temperature vulcanization), which aims to overcome the defects of the prior art.
In order to achieve the above object, the present invention provides a method for preparing a high temperature resistant and corrosion resistant composite coating for RTO, having the following characteristics: firstly, 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, brushing a heat insulation gelled material after air drying for 20-40min to form a heat insulation gelled coating, and standing for 48 hours after natural air drying to obtain a high-temperature-resistant corrosion-resistant composite coating for RTO;
the preparation method of the acid and alkali resistant modified polymer comprises the following steps:
step one, heating and mixing polymethyl disiloxane, chlorosilane, water, ethanol and hydrochloric acid, and adding tetraethyl orthosilicate to obtain organic silicon resin; mixing organic silicon resin and bisphenol A epoxy resin, and heating to obtain resin adhesive coating liquid; mixing inorganic ceramic nano-fibers, silica sol and polyvinyl alcohol solution, heating and stirring to obtain fiber filler liquid; step three, preparing a curing agent; 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, and heating and stirring to obtain an acid-base resistant modified polymer;
the preparation method of the heat-insulating cementing material comprises the following steps: mixing metakaolin, fly ash and an alkali activator or mixing metakaolin and an alkali activator 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 and corrosion-resistant composite coating for RTO, which can also have the following characteristics: wherein the spraying thickness of the modified polymer coating is 5-10mm; the spraying thickness of the heat-insulating gel coating is 10-15mm.
Further, the invention provides a preparation method of the high-temperature-resistant and corrosion-resistant composite coating for RTO, which can also have the following characteristics: in the preparation method of the acid-base resistant modified polymer, the specific method in the first step is as follows: stirring polymethyldisiloxane, chlorosilane, water, ethanol and hydrochloric acid at 70 ℃ for 3 hours at the speed of 100-300r/min, slowly adding tetraethyl orthosilicate in the process, and extracting with toluene to obtain organic silicon resin; mixing the synthesized organic silicon resin with bisphenol A epoxy resin, and stirring at 60 ℃ at a speed of 100-300r/min for 60min 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 epoxy resin is 70-80: 20-30.
Further, the invention provides a preparation method of the high-temperature-resistant and 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 and 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 second step is as follows: mixing inorganic ceramic nanofibers, silica sol and a polyvinyl alcohol solution, putting the mixture into a high-temperature reaction kettle, stirring the mixture for 1 hour at 1000 ℃, and naturally cooling the mixture to room temperature to obtain a fiber filler liquid; the mass fraction of the polyvinyl alcohol solution is 8-15%, and the mass ratio of the inorganic ceramic nano-fiber, the silica sol and the polyvinyl alcohol solution is 30-60: 20-60: 10-25.
Further, the invention provides a preparation method of the high-temperature-resistant and 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 inorganic 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 and 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 third step is as follows: stirring aliphatic polyamine at the rotating speed of 50-200r/min at 80 ℃ for 1-2h, adding ammonia water to adjust the pH to 9, naturally cooling, adding isophorone diamine, and stirring at the temperature of 50-100 ℃ at 200-500r/min for 1h to prepare 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 and corrosion-resistant composite coating for RTO, which can also have the following characteristics: wherein the aliphatic polyamine is one or more of diethylenetriamine or triethylene tetramine.
Further, the invention provides a preparation method of the high-temperature-resistant and 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 step four is as follows: and (3) mixing the resin adhesive solution obtained in the step one, the fiber filler solution 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 30min at 300-500r/min to obtain the acid and alkali resistant modified polymer.
Further, the invention provides a preparation method of the high-temperature-resistant and corrosion-resistant composite coating for RTO, which can also have the following characteristics: the specific preparation method of the heat-insulating cementing material comprises the following steps: uniformly mixing metakaolin, fly ash and an alkali activator, and stirring for 30-60 minutes at 500-1000r/min to obtain gel precursor slurry; slowly adding the foaming agent into the gel precursor slurry under stirring at the rotating speed of 1000-1500r/min, and stirring for 5-10min to obtain a self-foaming heat-insulating cementing material;
in the metakaolin, siO 2 Is 46-55% of 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 proportion of particles with the particle size of less than 10 mu m is 50-55%, the proportion of particles with the particle size of 10-50 mu m is 30-35%, and Al 2 O 3 Has a specific gravity of more than 30 percent and SiO 2 The specific gravity of (A) is more than 50%; the alkali activator is prepared by mixing water glass and sodium hydroxide according to the mass ratio of 5; the mass ratio of the metakaolin, the fly ash and the alkali activator is 35-60: 0-25: 55-75; the foaming agent consists of polyacrylonitrile fiber hydrogen peroxide mixed liquor, sodium dodecyl sulfate and calcium stearate; the mass fraction of the polyacrylonitrile fiber in the polyacrylonitrile fiber hydrogen peroxide mixed solution is30 to 40 percent; the mass ratio of the polyacrylonitrile fiber hydrogen peroxide mixed solution to the sodium dodecyl sulfate to the calcium stearate is 2-5: 1.
The invention has the beneficial effects that: the invention provides a preparation method of a high-temperature-resistant and corrosion-resistant composite coating for RTO (room temperature vulcanization) by coupling a porous heat-insulating cementing material and polymer resin, wherein the heat-insulating cementing material has better hardness and lower heat conductivity, and after the heat-insulating cementing material is subjected to pore channel modification and filling by using the flowable polymer resin, the heat-insulating gel and the modified polymer resin supplement 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, wherein 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 thereof, and under the action of an alkali activator, an Si-O bond in the polymer resin, an Si-O bond and an Al-O bond in silica-alumina sol in the polymer resin, and an-Si-O-Al bond in the aluminosilicate and the like are broken to form a three-dimensional molecular chain structure under the action of the alkali activator, so that a connecting layer is formed, wherein the resin layer and the porous heat-insulating layer are arranged on two sides of the connecting layer (shown in FIG. 4).
The thermal insulation layer has the main advantages of absorbing most of heat in the RTO and playing a role of an airflow distributor, so that high-concentration hot HCl is changed into low-concentration low-temperature HCl, and a resin layer is effectively protected; the middle connecting layer is a connecting layer of resin and a porous gelled material, the resin has fluidity, and when the resin is contacted with the porous gelled material, the resin infiltrates into a pore channel under the combined action of capillary force and gravity, so that the pore structure of the resin is effectively modified and sealed, HCl is prevented from dissipating, and the problem that RTO equipment is corroded is solved (as shown in figure 5). In addition, because the resin and the corresponding modification group contain Si-O and Al-O bonds, the resin and the corresponding modification group can form chemical bonds with a three-dimensional structure of-Si-O-Al-Si-O with the porous cementing material under the action of an alkali activator, and the porous cementing material and the compact resin bond can also form 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 block the dissipation of HCl, and the composite coating can be well adhered to RTO equipment due to the good fluidity and viscosity of the compact resin, so that the practicability of the material is good, and the compact resin 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-insulating material with high temperature resistance, high mechanical strength, wear resistance and low heat conductivity, and can play a good role in protecting the RTO pipeline and the polymer resin. On the other hand, the acid and alkali resistant modified polymer is used as the pore filler and the binder of the cementing material, so that the loss of acid in an RTO process is effectively reduced, the service life of RTO equipment is protected, the maintenance cost of the RTO equipment is reduced, and in addition, the flowability and the 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 (a) of the thermal insulation gelled material, an electron microscope (b) of a connecting layer of a high temperature and corrosion resistant composite coating prepared after the thermal insulation gelled material is modified by an acid and alkali resistant modified polymer, and an electron microscope (c) of inorganic ceramic nano-fiber used in the acid and alkali resistant modified polymer;
FIG. 2 is a graph showing the results of acid corrosion resistance of the high temperature and corrosion resistant composite coating for RTO of the present invention;
FIG. 3 is a thermal stability curve of the high temperature and corrosion resistant composite coating for RTO of the present invention under an oxygen atmosphere;
FIG. 4 is a preparation mechanism diagram of the high temperature resistant and corrosion resistant composite coating for RTO of the present invention;
FIG. 5 is a high temperature resistant and corrosion resistant schematic diagram of the high temperature resistant and corrosion resistant composite coating for RTO of the present invention.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
The embodiment provides a preparation method of a high-temperature-resistant and corrosion-resistant composite coating for RTO, which comprises the following steps: firstly, 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 of 5mm, brushing a heat insulation gelled material after air drying for 30min to form a heat insulation gelled coating of 15mm, and standing for 48 hours after natural 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: step one, stirring 10 parts (by mass, the same below) of hexamethyldisiloxane, 10 parts of methyltrichlorosilane, 15 parts of water, 10 parts of ethanol and 2 parts of hydrochloric acid at 70 ℃ at a speed of 100r/min for 3 hours, slowly adding 20 parts of tetraethyl orthosilicate in the process, and extracting with toluene to obtain organic silicon resin; 70 parts of synthetic silicone resin and 20 parts of bisphenol A epoxy resin are mixed and stirred at 60 ℃ for 60min at a speed of 100r/min to prepare the resin adhesive coating liquid. And step two, mixing 30 parts of inorganic boron nitride nanofibers, 20 parts of silica sol (aqueous solution of nano silicon dioxide (mass fraction of 20%), aluminum oxide (mass fraction of 5%) and sodium oxide (mass fraction of 0.06%)) and 10 parts of polyvinyl alcohol solution with the mass fraction of 8%, putting the mixture into a high-temperature reaction kettle, stirring the mixture at 1000 ℃ for 1 hour, and naturally cooling the mixture to room temperature to obtain the fiber filler liquid. And step three, stirring 1 part of diethylenetriamine at the rotating speed of 50r/min for 1h at the temperature of 80 ℃, adding ammonia water to adjust the pH value to 9, naturally cooling, adding 1 part of isophorone diamine, and stirring at the temperature of 50 ℃ at the speed of 200r/min for 1h to prepare the curing agent. And step four, mixing the resin viscous 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 300r/min for 30min at 50 ℃ to obtain the acid-base resistant modified polymer.
The preparation method of the high-strength porous heat-insulating cementing material comprises the following steps: 35 parts of metakaolin (SiO in the mixture) 2 Is 46-55% of Al 2 O 3 Has a specific gravity of 40-42%, and Al 2 O 3 With SiO 2 Is 0.85), 55 parts of alkali activator (prepared by mixing water glass and sodium hydroxide according to the mass ratio of 5; then, a foaming agent formed by 2 parts of polyacrylonitrile fiber hydrogen peroxide mixed solution (the mass fraction of the polyacrylonitrile fiber is 40 percent), 1 part of sodium dodecyl sulfate and 1 part of calcium stearate is slowly added into the gel precursor slurry under stirring at the rotating speed of 1000r/min, and the mixture is stirred for 5minObtaining the self-foaming heat-insulating cementing material.
An electron microscope image of the heat-insulating binding material is shown as a in fig. 1, an electron microscope image of a connecting layer (a joint of the acid-alkali resistant modified polymer coating and the heat-insulating binding layer) in the high-temperature-resistant and corrosion-resistant composite coating after the acid-alkali resistant modified polymer modifies the heat-insulating binding material is shown as b in fig. 1, and an electron microscope image of inorganic ceramic nanofibers used in the acid-alkali resistant modified polymer is shown as c in fig. 1. Comparing a and b in fig. 1, it can be seen that the acid-base resistant modified polymer is uniformly filled in the pores of the thermal insulation gelling material.
Example 2
The embodiment provides a preparation method of a high-temperature-resistant and corrosion-resistant composite coating for RTO, which comprises the following steps: firstly, high-pressure spraying of an acid-base resistant modified polymer on the inner wall surface of RTO equipment to form an acid-base resistant modified polymer coating of 8mm, brushing of a heat insulation gelled material after air drying for 20min to form a heat insulation gelled coating of 12mm, and standing for 48 hours after natural 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: step one, stirring 15 parts of a mixture of 1, 3-tetramethyldisiloxane 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 ℃ at a speed of 200r/min for 3 hours, slowly adding 20 parts of tetraethyl orthosilicate in the process, and extracting with toluene to obtain organic silicon resin; 75 parts of synthesized organic silicon resin and 25 parts of bisphenol A epoxy resin are mixed and stirred for 60min at the temperature of 60 ℃ at the speed of 200r/min to prepare the resin adhesive coating liquid. And step two, mixing 45 parts of inorganic silicon nitride nano fibers, 40 parts of silica sol (aqueous solution of nano silicon dioxide (mass fraction of 35%), aluminum oxide (mass fraction of 10%) and sodium oxide (mass fraction of 0.1%)) and 17 parts of polyvinyl alcohol solution with the mass fraction of 15%, putting the mixture into a high-temperature reaction kettle, stirring the mixture for 1 hour at 1000 ℃, and then naturally cooling the mixture to room temperature to obtain the fiber filler liquid. And step three, stirring 2 parts of diethylenetriamine at the rotating speed of 200r/min for 2h at the temperature of 80 ℃, adding ammonia water to adjust the pH value to 9, naturally cooling, adding 1 part of isophorone diamine, and stirring at the temperature of 100 ℃ for 1h at the speed of 500r/min to prepare the curing agent. And step four, mixing the resin viscous 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 300r/min for 30min at 50 ℃ to obtain the acid-base resistant modified polymer.
The preparation method of the high-strength porous heat-insulating cementing material comprises the following steps: 60 parts of metakaolin (wherein SiO) 2 Is 46-55% of Al 2 O 3 Has a specific gravity of 40-42%, and Al 2 O 3 With SiO 2 0.85 mass percent), 25 parts of fly ash (the proportion of particles with the particle diameter of less than 10 mu m is 50-55 percent, the proportion of particles with the particle diameter of 10-50 mu m is 30-35 percent, and Al 2 O 3 Has a specific gravity of more than 30 percent and SiO 2 The specific gravity of the gel precursor is more than 50 percent), 75 parts of alkali activator (prepared by mixing water glass and sodium hydroxide according to the mass ratio of 5; and slowly adding a foaming agent formed by 5 parts of polyacrylonitrile fiber hydrogen peroxide mixed liquor (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 at the rotating speed of 1500r/min while stirring, and stirring for 10min to obtain the self-foaming heat-insulating cementing material.
Example 3
The embodiment provides a preparation method of a high-temperature-resistant and corrosion-resistant composite coating for RTO, which comprises the following steps: firstly, spraying an acid-base resistant modified polymer on the inner wall surface of RTO equipment at high pressure to form an acid-base resistant modified polymer coating of 5mm, brushing a heat insulation gelled material after air drying for 40min to form a heat insulation gelled coating of 15mm, and standing for 48 hours after natural 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: step one, stirring 13 parts of 1, 3-tetramethyldisiloxane, 10 parts of methyltrichlorosilane, 15 parts of water, 10 parts of ethanol and 2 parts of hydrochloric acid at 70 ℃ at a speed of 100r/min for 3 hours, slowly adding 20 parts of tetraethyl orthosilicate in the process, and extracting with toluene to obtain organic silicon resin; 70 parts of synthetic silicone resin and 20 parts of bisphenol A epoxy resin are mixed and stirred at 60 ℃ for 60min at a speed of 100r/min to prepare the resin adhesive coating liquid. And step two, mixing 40 parts of inorganic silicon nitride nanofibers and inorganic boron nitride nanofibers, 50 parts of silica sol (aqueous solution of nano silicon dioxide (mass fraction of 28%), aluminum oxide (mass fraction of 8%) and sodium oxide (mass fraction of 0.08%)) and 13 parts of 11% polyvinyl alcohol solution, putting the mixture into a high-temperature reaction kettle, stirring the mixture for 1 hour at 1000 ℃, and then naturally cooling the mixture to room temperature to obtain the fiber filler liquid. And step three, stirring 2 parts of diethylenetriamine at the rotating speed of 150r/min for 1.5h at the temperature of 80 ℃, adding ammonia water to adjust the pH value to 9, naturally cooling, adding 1 part of isophorone diamine, and stirring at the temperature of 75 ℃ for 1h at the speed of 300r/min to prepare the curing agent. And step four, mixing the resin viscous 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 300r/min for 30min at 50 ℃ to obtain the acid-base resistant modified polymer.
The preparation method of the high-strength porous heat-insulating cementing material comprises the following steps: 45 parts of metakaolin (SiO in the mixture) 2 Is 46-55% of Al 2 O 3 Has a specific gravity of 40-42%, and Al 2 O 3 With SiO 2 0.85 mass percent of the total amount of the components, 15 parts of fly ash (the proportion of particles with the particle diameter of less than 10 mu m is 50-55 percent, the proportion of particles with the particle diameter of 10-50 mu m is 30-35 percent, and Al 2 O 3 Has a specific gravity of more than 30 percent and SiO 2 The specific gravity of the gel precursor is more than 50 percent), 65 parts of alkali activator (prepared by mixing water glass and sodium hydroxide according to the mass ratio of 5; and slowly adding a foaming agent formed by 4 parts of polyacrylonitrile fiber hydrogen peroxide mixed liquor (the mass fraction of the polyacrylonitrile fiber is 35 percent), 1 part of sodium dodecyl sulfate and 1 part of calcium stearate into the gel precursor slurry at the rotating speed of 1300r/min while stirring, and stirring for 8min to obtain the self-foaming heat-insulating cementing material.
The high temperature and corrosion resistant composite coating for RTO obtained in example 1 was subjected to an acid corrosion resistance test: a clean A4 paper is padded on a clean and smooth glass plate, a 5mm acid and alkali resistant modified polymer coating prepared according to the step of example 1 is firstly sprayed on the clean and smooth glass plate (five coatings with the same size and length are sprayed on a white paper at intervals), after air drying is carried out for 30min, a 15mm heat insulation gel coating prepared according to the step of example 1 is coated on the white paper, after the white paper is naturally air-dried and stands for 48 hours, the A4 paper is taken down from the glass plate, the five composite coatings are placed on a heating plate and are respectively heated for 1 hour, 2 hours, 3 hours, 4 hours and 5 hours (the white paper surface is in contact with the heating plate, the experiment is safe), after cooling, the five composite coatings are placed on a universal material testing machine for strength testing, and the result is shown in figure 2.
The high temperature resistance and corrosion resistance composite coating for RTO obtained in example 1 was subjected to a high temperature resistance test: a clean A4 paper is laid on a clean and smooth glass plate, a 5mm acid and alkali resistant modified polymer coating prepared according to the steps in example 1 is sprayed on the glass plate, the glass plate is dried in the air for 30min, then a 15mm heat insulation gel coating prepared according to the steps in example 1 is coated on the glass plate, the A4 paper is taken off from the glass plate after the glass plate is naturally dried in the air and stands for 48 hours, a proper amount of composite coating is taken and put into a differential thermal analyzer, 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 and corrosion resistant composite coating for RTO provided by the invention has good high temperature and corrosion resistance.
Claims (10)
1. A preparation method of a high-temperature-resistant corrosion-resistant composite coating for RTO is characterized by comprising the following steps:
firstly spraying an acid and alkali resistant modified polymer on the surface of the inner wall of RTO equipment to form an acid and alkali resistant modified polymer coating, brushing a heat insulation gelled material after air drying for 20-40min to form a heat insulation gelled coating, and naturally air drying to obtain a 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, heating and mixing polymethyl disiloxane, chlorosilane, water, ethanol and hydrochloric acid, and adding tetraethyl orthosilicate to obtain organic silicon resin; mixing organic silicon resin and bisphenol A epoxy resin, and heating to obtain a resin adhesive coating liquid;
mixing inorganic ceramic nano-fibers, silica sol and polyvinyl alcohol solution, heating and stirring to obtain fiber filler liquid;
step three, preparing a curing agent;
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, and heating and stirring to obtain an acid-base resistant modified polymer;
the preparation method of the heat-insulating cementing material comprises the following steps: mixing metakaolin, fly ash and an alkali activator or mixing metakaolin and an alkali activator 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 and corrosion-resistant composite coating for the RTO according to claim 1, wherein the method comprises the following steps:
wherein the spraying thickness of the modified polymer coating is 5-10mm;
the spraying thickness of the heat-insulating gel coating is 10-15mm.
3. The method for preparing the high-temperature-resistant and corrosion-resistant composite coating for the RTO according to claim 1, wherein the method comprises the following steps:
in the preparation method of the acid and alkali resistant modified polymer, the specific method of the first step is as follows: stirring polymethyldisiloxane, chlorosilane, water, ethanol and hydrochloric acid at 70 ℃ for 3 hours at the speed of 100-300r/min, slowly adding tetraethyl orthosilicate in the process, and extracting with toluene to obtain organic silicon resin;
mixing the synthesized organic silicon resin with bisphenol A epoxy resin, and stirring at 60 ℃ for 60min at a speed of 100-300r/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 epoxy resin is 70-80: 20-30.
4. The method for preparing the high temperature and corrosion resistant composite coating for RTO according to claim 1 or 3, wherein:
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 and corrosion-resistant composite coating for the RTO according to claim 1, wherein the method comprises the following steps:
in the preparation method of the acid and alkali resistant modified polymer, the specific method in the second step is as follows: mixing inorganic ceramic nano-fiber, silica sol and polyvinyl alcohol solution, stirring for 1h at 1000 ℃, and then naturally cooling to room temperature to obtain fiber filler liquid;
the mass fraction of the polyvinyl alcohol solution is 8-15%, and the mass ratio of the inorganic ceramic nano-fiber, the silica sol and the polyvinyl alcohol solution is 30-60: 20-60: 10-25.
6. The method for preparing the high temperature and corrosion resistant composite coating for RTO according to claim 1 or 5, characterized in that:
wherein the inorganic ceramic nanofiber is one or more of inorganic silicon carbide nanofiber, inorganic boron nitride nanofiber inorganic 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 and corrosion-resistant composite coating for RTO according to claim 1, wherein:
in the preparation method of the acid and alkali resistant modified polymer, the specific method of the third step is as follows: stirring aliphatic polyamine at the rotating speed of 50-200r/min at 80 ℃ for 1-2h, adding ammonia water to adjust the pH to 9, naturally cooling, adding isophorone diamine, and stirring at the temperature of 50-100 ℃ at 200-500r/min for 1h to prepare a curing agent;
the mass ratio of the aliphatic polyamine and the isophorone diamine is 1-3: 1.
8. The method for preparing the high temperature and corrosion resistant composite coating for RTO according to claim 1 or 7, wherein:
wherein the aliphatic polyamine is one or more of diethylenetriamine or triethylene tetramine.
9. The method for preparing the high-temperature-resistant and corrosion-resistant composite coating for the RTO according to claim 1, wherein the method comprises the following steps:
in the preparation method of the acid and alkali resistant modified polymer, the specific method of the step four is as follows: and (3) mixing the resin adhesive solution obtained in the step one, the fiber filler solution 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 30min at 300-500r/min to obtain the acid and alkali resistant modified polymer.
10. The method for preparing the high-temperature-resistant and corrosion-resistant composite coating for RTO according to claim 1, wherein:
the specific preparation method of the heat-insulating cementing material comprises the following steps: uniformly mixing metakaolin, fly ash and an alkali activator, and stirring for 30-60 minutes at 500-1000r/min to obtain gel precursor slurry; slowly adding the foaming agent into the gel precursor slurry under stirring at the rotating speed of 1000-1500r/min, and stirring for 5-10min to obtain a self-foaming heat-insulating cementing material;
in the metakaolin, siO is 2 Is 46-55% of 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 proportion of particles with the particle size of less than 10 mu m is 50-55%, the proportion of particles with the particle size of 10-50 mu m is 30-35%, and Al 2 O 3 Has a specific gravity of more than 30 percent and SiO 2 The specific gravity of (A) is more than 50%;
the alkali activator is prepared by mixing water glass and sodium hydroxide according to the mass ratio of 5;
the mass ratio of the metakaolin, the fly ash and the alkali activator is 35-60: 0-25: 55-75;
the foaming agent consists of polyacrylonitrile fiber hydrogen peroxide mixed liquor, sodium dodecyl sulfate and calcium stearate; the mass fraction of polyacrylonitrile fiber in the polyacrylonitrile fiber hydrogen peroxide mixed solution is 30-40%; the mass ratio of the polyacrylonitrile fiber hydrogen peroxide mixed solution to the sodium dodecyl sulfate to the calcium stearate is 2-5: 1.
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