Teflon anti-corrosion coating and preparation method of equipment and air pipe for anti-corrosion experiment

Abstract

The invention relates to the technical field of anti-corrosion materials, and discloses a preparation method of a Teflon anti-corrosion coating, equipment for an anti-corrosion experiment and an air pipe. The Teflon anticorrosive paint comprises the following raw material components: 40%-60% of polytetrafluoroethylene powder, 20%-30% of epoxy resin, 1%-3% of talcum powder, 2%-5% of a dispersing agent, 0.5%-2% of a defoaming agent, 5%-10% of polyphenylene sulfide, 5%-10% of texanol, 3%-8% of an organic polyol curing agent and 0.5%-2% of a coloring agent. According to the preparation method of the equipment and the air pipe for the anti-corrosion experiment, the equipment and the air pipe are prepared by utilizing the teflon anti-corrosion coating. The curing time of the Teflon anti-corrosion coating can be effectively shortened, the production efficiency can be improved, the sintering and curing temperature of the coating can be reduced, energy consumption can be reduced, the coating has high acid and alkali corrosion resistance, and the service life of prepared equipment and pipe fittings can be prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of anti-corrosion materials, and specifically to a method for preparing a Teflon anti-corrosion coating, anti-corrosion experimental equipment, and an air duct. Background Art

[0002] In recent years, with the improvement of environmental protection standards and awareness, VOCs waste gas purification equipment and collection pipes and fittings have been widely used to purify various highly corrosive strong acid and strong alkali waste gases. In this special environment of strong acid and strong alkali, purification equipment and collection air ducts made of conventional carbon steel or stainless steel will be severely corroded, thereby reducing the service life of the equipment and air ducts, and may even cause safety accidents. Most of the current products on the market use paint anti-corrosion coatings, which have a short anti-corrosion cycle and poor anti-corrosion effect against strong acids and strong alkalis. Summary of the invention

[0003] The purpose of this application is to provide a Teflon anti-corrosion coating, anti-corrosion experimental equipment and a method for preparing an air duct to solve the technical problems raised in the above background.

[0004] To achieve the above objectives, this application discloses the following technical solutions:

[0005] In the first aspect, the present application provides a Teflon anti-corrosion coating. The raw material components of the Teflon anti-corrosion coating include, in terms of mass percentage: 40%-60% of polytetrafluoroethylene powder, 20%-30% of epoxy resin, 1%-3% of talc, 2%-5% of dispersant, 0.5%-2% of defoaming agent, 5%-10% of polyphenylene sulfide, 5%-10% of alcohol ester dodecyl, 3%-8% of organic polyol curing agent and 0.5%-2% of colorant.

[0006] Preferably, the preparation method of the Teflon anticorrosive coating comprises the following steps:

[0007] Deionized water is added to the raw material components and stirred evenly to obtain the Teflon anti-corrosion coating.

[0008] Preferably, the raw material components include: 55% polytetrafluoroethylene powder, 25% epoxy resin, 3% talcum powder, 2% dispersant, 1% defoamer, 5% polyphenylene sulfide, 5% alcohol ester dodecyl, 3% organic polyol curing agent and 1% colorant.

[0009] In a second aspect, the present application discloses a method for preparing an anti-corrosion experimental device and an air duct, the method comprising the following steps in sequence:

[0010] S1: Prepare the Teflon anti-corrosion coating as described in any one of claims 1 to 3;

[0011] S2: Prepare equipment workpieces and air duct workpieces;

[0012] S3: Pre-treating the equipment workpiece and the workpiece, wherein the pre-treatment includes attaching a phosphating layer and drying;

[0013] S4: Primer spraying is performed on the surface of equipment workpieces and air duct workpieces;

[0014] S5: Dry the equipment workpiece and the air duct workpiece after the primer spraying and then cool them naturally to room temperature;

[0015] S6: Use the prepared Teflon anti-corrosion coating to spray topcoat on equipment workpieces and air duct workpieces;

[0016] S7: high temperature sintering and curing of equipment workpieces and air duct workpieces;

[0017] S8: The equipment workpiece and the air duct workpiece are respectively processed to obtain the equipment for the anti-corrosion experiment and the air duct for the anti-corrosion experiment.

[0018] Preferably, the pretreatment comprises the following steps in sequence:

[0019] Cleaning equipment workpieces and air duct workpieces to remove surface contaminants, including grease;

[0020] Sandblast the surface oxide layer of equipment workpieces and air duct workpieces, and rinse them with clean water;

[0021] Immerse the equipment workpiece and the air duct workpiece in the phosphating solution to form a surface phosphating layer;

[0022] Dry the equipment workpieces and air duct workpieces.

[0023] Preferably, the equipment workpiece is made of carbon steel, and the air duct workpiece is made of stainless steel.

[0024] Preferably, the primer is a reactive polyamide resin.

[0025] Preferably, in S5, the drying of the equipment workpiece and the air duct workpiece after the primer spraying specifically includes:

[0026] Place the equipment workpiece and air duct workpiece that have been primed in a drying room at a drying temperature of 90°C for 5-10 minutes.

[0027] Preferably, in S7, the high temperature sintering and curing specifically comprises the following steps:

[0028] The equipment workpiece and the air duct workpiece are placed in a baking room, and the baking room is controlled to slowly heat up to 90°C. After the surface temperature of the equipment workpiece and the air duct workpiece is maintained at 90°C, the baking room is maintained at a first temperature condition of 90°C for 6-10 minutes;

[0029] The baking room is controlled to slowly heat up to 250°C, and after the surface temperature of the equipment workpiece and the air duct workpiece is maintained at 250°C, the baking room is maintained at a second temperature condition of 250°C for 10-15 minutes;

[0030] The baking room is controlled to slowly heat up to a third temperature condition and maintained for 10-30 minutes, wherein the third temperature condition is greater than 350°C.

[0031] Beneficial effects: Compared with other similar anti-corrosion coating formulas on the market, the Teflon anti-corrosion coating prepared by the present invention, the anti-corrosion experimental equipment and the air duct preparation method require lower sintering and curing temperature, thereby reducing energy consumption, saving energy, and reducing production costs; and, compared with other similar anti-corrosion coating formulas on the market, under the same anti-corrosion performance conditions, the coating thickness of this formula is smaller and the coating utilization efficiency is higher; and, compared with other similar anti-corrosion coating formulas on the market, under the same anti-corrosion performance conditions, the time required for sintering and curing of this formula is shorter, thereby improving production efficiency. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0033] In this article, the term "comprising" is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "comprising..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0034] The present embodiment discloses a Teflon anti-corrosion coating. The raw material components of the Teflon anti-corrosion coating include, by mass percentage: 40%-60% of polytetrafluoroethylene powder, 20%-30% of epoxy resin, 1%-3% of talc, 2%-5% of dispersant, 0.5%-2% of defoamer, 5%-10% of polyphenylene sulfide, 5%-10% of alcohol ester dodecahydrate, 3%-8% of organic polyol curing agent and 0.5%-2% of colorant.

[0035] The preparation method of the Teflon anticorrosive coating comprises the following steps:

[0036] Deionized water is added to the raw material components and stirred evenly to obtain the Teflon anti-corrosion coating.

[0037] Based on the above, in order to further verify / obtain a product with better performance, this embodiment text conducts a formulation test with the following formulation:

[0038] Formula 1: 40% polytetrafluoroethylene (PTFE) powder, 30% epoxy resin, 3% talc, 5% dispersant, 2% defoamer, 5% polyphenylene sulfide, 5% alcohol ester dodecyl, 8% organic polyol curing agent, and 2% colorant;

[0039] Formula 2: 45% polytetrafluoroethylene (PTFE) powder, 28% epoxy resin, 2% talc, 4% dispersant, 2% defoaming agent, 6% polyphenylene sulfide, 6% alcohol ester dodecyl ether, 5% organic polyol curing agent, and 2% colorant.

[0040] Formula 3: 50% polytetrafluoroethylene (PTFE) powder, 28% epoxy resin, 2.5% talc, 3% dispersant, 1% defoamer, 5% polyphenylene sulfide, 5% alcohol ester dodecyl, 5% organic polyol curing agent, and 1.5% colorant;

[0041] Formula 4: 50% polytetrafluoroethylene (PTFE) powder, 20% epoxy resin, 3% talc, 5% dispersant, 2% defoamer, 5% polyphenylene sulfide, 5% alcohol ester dodecyl, 8% organic polyol curing agent, and 2% colorant;

[0042] Formula 5: 50% polytetrafluoroethylene (PTFE) powder, 25% epoxy resin, 2% talc, 2% dispersant, 1% defoamer, 10% polyphenylene sulfide, 5% alcohol ester dodecyl, 4% organic polyol curing agent, and 1% colorant;

[0043] Formula 6: polytetrafluoroethylene (PTFE) powder accounts for 60%, epoxy resin accounts for 23%, talc accounts for 1%, dispersant accounts for 2%, defoamer accounts for 0.5%, polyphenylene sulfide accounts for 5%, alcohol ester accounts for 5%, organic polyol curing agent accounts for 3%, and colorant accounts for 0.5%;

[0044] Formula 7: polytetrafluoroethylene (PTFE) powder accounts for 50%, epoxy resin accounts for 20%, talc accounts for 2%, dispersant accounts for 5%, defoamer accounts for 2%, polyphenylene sulfide accounts for 5%, alcohol ester accounts for 10%, organic polyol curing agent accounts for 4%, and colorant accounts for 2%;

[0045] Formula 8: polytetrafluoroethylene (PTFE) powder accounts for 55%, epoxy resin accounts for 25%, talc accounts for 3%, dispersant accounts for 2%, defoaming agent accounts for 1%, polyphenylene sulfide accounts for 5%, alcohol ester accounts for 5%, organic polyol curing agent accounts for 3%, and colorant accounts for 1%.

[0046] This embodiment also discloses a method for preparing an anti-corrosion experimental device and an air duct using the above-mentioned Teflon anti-corrosion coating, the method comprising the following steps in sequence:

[0047] S1: Prepare the Teflon anti-corrosion coating as described in any one of claims 1 to 3;

[0048] S2: Prepare equipment workpieces and air duct workpieces;

[0049] S3: Pre-treating the equipment workpiece and the workpiece, wherein the pre-treatment includes attaching a phosphating layer and drying;

[0050] S4: Primer spraying is performed on the surface of equipment workpieces and air duct workpieces;

[0051] S5: Dry the equipment workpiece and the air duct workpiece after the primer spraying and then cool them naturally to room temperature;

[0052] S6: Use the prepared Teflon anti-corrosion coating to spray topcoat on equipment workpieces and air duct workpieces;

[0053] S7: high temperature sintering and curing of equipment workpieces and air duct workpieces;

[0054] S8: The equipment workpiece and the air duct workpiece are respectively processed to obtain the equipment for the anti-corrosion experiment and the air duct for the anti-corrosion experiment.

[0055] In the above-mentioned preparation method, specifically, after determining the coating formula, the equipment and air duct used for the anti-corrosion experiment are processed and manufactured. In particular, in the present embodiment, the equipment and air duct are prepared from equipment workpieces (such as housing sheet materials, etc.) and air duct (such as pipe fittings, etc.) workpieces, and the materials of the equipment and air duct are respectively made of carbon steel and stainless steel. In order to make the processed equipment and air duct surfaces have enough adhesion, the equipment workpieces and air duct workpieces must be surface treated. First, ensure that the surface is clean, free of grease and other pollutants, use sandblasting to treat the oxide layer on the surface, and rinse it with clean water. The rinsed equipment workpieces and air duct workpieces are immersed in phosphating solution, so that their surfaces are covered by phosphating solution, and a phosphating layer is generated to increase the surface adhesion. The surface phosphated equipment workpieces and air duct workpieces are taken out of the phosphating solution, and their surfaces must be dried before applying primer, because humidity can affect the performance of the coating.

[0056] After drying, the equipment workpiece and the air duct workpiece are first sprayed with a layer of primer, the primer is a reactive polyamide resin, and the primer spraying thickness is uniform. The specific thickness is determined according to the thickness of different Teflon anticorrosive topcoats. The reactive polyamide resin primer coating thickness of the present invention is 20 microns. The equipment workpiece and the air duct workpiece sprayed with primer are placed in a drying room for drying. The drying temperature is about 90°C and maintained for 5 to 10 minutes, and then naturally cooled to room temperature. After the equipment workpiece and the air duct workpiece are dried, the topcoat is sprayed after inspection. Each topcoat formula is sprayed on the equipment workpiece and the air duct workpiece, and the spraying thickness of the Teflon anticorrosive topcoat is 80 microns. The coating maintains a uniform thickness to avoid bubbles, and different Teflon anticorrosive formulas are well marked. The equipment workpiece and the air duct workpiece sprayed with Teflon anticorrosive topcoat are sent to a high-temperature furnace room for high-temperature sintering and curing. For different Teflon anticorrosive coating formulas, the sintering temperature and duration under the same environment are adopted during sintering and curing. For the same Teflon anti-corrosion coating formula, different sintering temperatures and different durations are adopted under the same environment during sintering and curing, in order to obtain different anti-corrosion topcoats. The sintering and curing temperature must make the temperature of the equipment workpiece and the air duct workpiece above 350℃, because polytetrafluoroethylene (PTFE) powder will only melt at above 350℃. The equipment workpiece and the air duct workpiece are kept above 350℃ for more than 10 minutes, so that the polytetrafluoroethylene (PTFE) powder is fully melted and bonded with the primer. All equipment workpieces and air duct workpieces sprayed with Teflon anti-corrosion topcoat are baked at 350℃, 360℃, 370℃, 380℃, 390℃, and 400℃ for 10 minutes, 15 minutes, 20 minutes, 25 minutes, and 30 minutes respectively, and finally the topcoats with different curing effects are obtained. The equipment workpieces and air duct workpieces sprayed with Teflon anti-corrosion topcoat coating are first slowly heated to 90°C in a baking room, and the surface temperature of the equipment workpieces and air duct workpieces is kept at 90°C for 6 to 10 minutes. Then continue to slowly heat the surface temperature of the equipment workpieces and air duct workpieces to 250°C, and keep baking at this temperature for 10 to 15 minutes. Finally, slowly heat to the test temperatures of 350°C, 360°C, 370°C, 380°C, 390°C, and 400°C for sintering and curing, and keep at the test temperature for 10 to 30 minutes. After the anti-corrosion coating is sintered and cured, the equipment workpieces and air duct workpieces are placed in a closed room to cool naturally to room temperature, and observe the adhesion and connection between the equipment workpieces and air duct workpieces and the coating, as well as the film formation on the coating surface.

[0057] Based on the aforementioned various formulas, combined with the preparation method of the equipment and air duct for anti-corrosion experiment, the prepared equipment workpieces and air duct workpieces were subjected to anti-corrosion tests, specifically: after cooling, all the equipment and pipe fittings sprayed with Teflon anti-corrosion coating and the equipment and pipe fittings not sprayed with Teflon anti-corrosion coating were placed in hydrochloric acid, hydrofluoric acid, and sodium hydroxide solutions for corrosion resistance tests. Part of the same equipment and pipe fittings was placed in hydrochloric acid, hydrofluoric acid, and sodium hydroxide solutions, and the other part was not placed outside the solution and exposed to the indoor air. After a period of corrosion testing, the equipment and pipe fittings were taken out to observe and compare the degree of corrosion on their surfaces.

[0058] After many corrosion test comparisons, the final result is a Teflon anti-corrosion coating formula 8: polytetrafluoroethylene (PTFE) powder accounts for 55%, epoxy resin accounts for 25%, talc accounts for 3%, dispersant accounts for 2%, defoamer accounts for 1%, polyphenylene sulfide accounts for 5%, alcohol ester accounts for 5%, organic polyol curing agent accounts for 3%, and colorant accounts for 1%. It is applied to equipment and pipe fittings whose primer is reactive polyamide resin. When the thickness of the formulated topcoat coating is 80 microns, the equipment and pipe fittings are first slowly heated to 90°C in a baking room and maintained for 6 minutes, then heated to 250°C and maintained for 12 minutes of baking, and finally slowly heated to 380°C for sintering and curing, and maintained at 360°C for 20 minutes, and then naturally cooled to room temperature. The anti-corrosion coating formed has the best film-forming and curing effect, and its corrosion resistance is better than other formula coatings whether in strong hydrochloric acid solution, strong alkali sodium hydroxide solution or hydrofluoric acid. Under the same anti-corrosion performance conditions, the coating thickness, sintering and curing temperature and time of the anti-corrosion coating of this formula are superior to similar coatings on the market.

[0059] In summary, the components and proportions of the Teflon anticorrosive coating of this embodiment are based on the environment and anticorrosion requirements of the equipment and pipe fittings. The anticorrosion coating components are polytetrafluoroethylene (PTFE) powder, epoxy resin, talcum powder, dispersant, deionized water, colorant, defoamer, polyphenylene sulfide, alcohol ester twelve, and organic polyol curing agent. The components are mixed in different proportions, and the coating proportions of different proportions are sprayed on the equipment and pipe fittings respectively, and then the acid-base corrosion comparison experiment is carried out. Based on the above, compared with the existing ones on the market, the Teflon anticorrosive coating of this embodiment and the equipment and air duct prepared by the preparation method of the anticorrosion experiment equipment and air duct prepared by using the Teflon anticorrosive coating have the following characteristics and effects:

[0060] 1. By optimizing the ingredients and ratio of the Teflon anti-corrosion coating formula, the curing time of the Teflon anti-corrosion coating can be effectively shortened and production efficiency can be improved.

[0061] 2. By optimizing the ingredients and ratio of Teflon anti-corrosion coating formula, the sintering and curing temperature of the coating can be lowered, thus reducing energy consumption.

[0062] 3. Equipment and pipe fittings sprayed with Teflon anti-corrosion coating have good acid and alkali corrosion resistance, which improves the service life of equipment and pipe fittings.

[0063] Finally, it should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A Teflon anti-corrosion coating, characterized in that: According to mass percentage, the raw material components of this Teflon anti-corrosion coating include: 40%-60% polytetrafluoroethylene powder, 20%-30% epoxy resin, 1%-3% talc, 2%-5% dispersant, 0.5%-2% defoaming agent, 5%-10% polyphenylene sulfide, 5%-10% alcohol ester dodecyl, 3%-8% organic polyol curing agent and 0.5%-2% colorant.

2. The Teflon anticorrosive coating according to claim 1, characterized in that: The preparation method of the Teflon anticorrosive coating comprises the following steps: Deionized water is added to the raw material components and stirred evenly to obtain the Teflon anti-corrosion coating.

3. The Teflon anticorrosive coating according to claim 1, characterized in that: The raw material components include: 55% of polytetrafluoroethylene powder, 25% of epoxy resin, 3% of talcum powder, 2% of dispersant, 1% of defoamer, 5% of polyphenylene sulfide, 5% of alcohol ester dodecyl, 3% of organic polyol curing agent and 1% of colorant.

4. A method for preparing an anti-corrosion test device and an air duct, characterized in that: The method comprises the following steps in sequence: S1: Prepare the Teflon anti-corrosion coating as described in any one of claims 1 to 3; S2: Prepare equipment workpieces and air duct workpieces; S3: Pre-treating the equipment workpiece and the workpiece, wherein the pre-treatment includes attaching a phosphating layer and drying; S4: Primer spraying is performed on the surface of equipment workpieces and air duct workpieces; S5: Dry the equipment workpiece and the air duct workpiece after the primer spraying and then cool them naturally to room temperature; S6: Use the prepared Teflon anti-corrosion coating to spray topcoat on equipment workpieces and air duct workpieces; S7: high temperature sintering and curing of equipment workpieces and air duct workpieces; S8: The equipment workpiece and the air duct workpiece are respectively processed to obtain the equipment for the anti-corrosion experiment and the air duct for the anti-corrosion experiment.

5. The method for preparing the anti-corrosion test equipment and the air duct according to claim 4, characterized in that: The pretreatment comprises the following steps in sequence: Cleaning equipment workpieces and air duct workpieces to remove surface contaminants, including grease; Sandblast the surface oxide layer of equipment workpieces and air duct workpieces, and rinse them with clean water; Immerse the equipment workpiece and the air duct workpiece in the phosphating solution to form a surface phosphating layer; Dry the equipment workpieces and air duct workpieces.

6. The method for preparing the anti-corrosion test equipment and the air duct according to claim 4, characterized in that: The equipment workpiece is made of carbon steel, and the air duct workpiece is made of stainless steel.

7. The method for preparing the anti-corrosion test equipment and the air duct according to claim 4, characterized in that: The primer is a reactive polyamide resin.

8. The method for preparing the anti-corrosion test equipment and the air duct according to claim 4, characterized in that: In the S5, the drying of the equipment workpiece and the air duct workpiece after the primer spraying specifically includes: Place the equipment workpiece and air duct workpiece that have been primed in a drying room at a drying temperature of 90°C for 5-10 minutes.

9. The method for preparing the anti-corrosion test equipment and the air duct according to claim 4, characterized in that: In S7, the high temperature sintering and curing specifically includes the following steps: The equipment workpiece and the air duct workpiece are placed in a baking room, and the baking room is controlled to slowly heat up to 90°C. After the surface temperature of the equipment workpiece and the air duct workpiece is maintained at 90°C, the baking room is maintained at a first temperature condition of 90°C for 6-10 minutes; The baking room is controlled to slowly heat up to 250°C, and after the surface temperature of the equipment workpiece and the air duct workpiece is maintained at 250°C, the baking room is maintained at a second temperature condition of 250°C for 10-15 minutes; The baking room is controlled to slowly heat up to a third temperature condition and maintained for 10-30 minutes, wherein the third temperature condition is greater than 350°C.