A diatomite modified water glass carbon-based electrothermal paint, a preparation method and application thereof

Abstract

The application discloses a diatomite modified water glass carbon-based electrothermal paint, a preparation method and application thereof, and belongs to the technical field of electrothermal functional paint preparation. The diatomite modified water glass carbon-based electrothermal paint is prepared by mixing and stirring activated diatomite, water glass, carbon black, graphite, graphene and silane coupling agent as raw materials, is applied on a sample plate, and is subjected to heat curing treatment, so that a diatomite modified water glass carbon-based electrothermal coating is finally prepared. The coating is added with the activated diatomite, the temperature of the coating is increased by 25% to 30%, and the power consumption is reduced by 20% to 25%. Meanwhile, the process is simple, efficient and temperature-controllable. The diatomite modified water glass carbon-based electrothermal paint can be widely applied to special pavements, such as an airplane runway, which needs to be rapidly deiced and snow-removed, or a field of oil transportation pipeline heating.

Description

Technical Field

[0001] This invention belongs to the field of electrothermal functional coating preparation technology, and specifically relates to a diatomaceous earth modified water glass carbon-based electrothermal coating, coating, preparation method and application. Background Technology

[0002] Electrothermal coatings are a new type of coating that possesses temperature control properties, distinguishing them from anti-corrosion and waterproof coatings. Improving the performance of electrothermal coatings through technological modification, filler modification, and other methods has become a hot research topic both domestically and internationally. In addition to excellent electrical conductivity, electrothermal coatings also offer advantages such as high thermal efficiency, environmental friendliness, low cost, and low energy consumption, making them widely applicable in numerous fields including construction, transportation, and chemical engineering.

[0003] Diatomite is a valuable resource in my country. However, how to further enhance the added value of diatomite utilization and address the problems in the diatomite industry's development, such as its reliance on raw material mining and primary processing, the small proportion of high-tech deep-processed products, and the low quality of existing products, has become a pressing issue and a key research focus for the industry.

[0004] In summary, this invention utilizes graphene, carbon black, carbon fiber, diatomaceous earth, water glass, and silane coupling agents as main raw materials, and employs alkali activation and high-temperature activation technologies to achieve the preparation of high-performance, cost-effective inorganic electrothermal coatings made from water glass and diatomaceous earth. The resulting coatings exhibit high temperature resistance, low energy consumption, and high cost-effectiveness. Furthermore, its application in the field of electrothermal coatings has been demonstrated, which will undoubtedly promote technological development in the environmental protection field. This research has not been reported domestically or internationally. Summary of the Invention

[0005] This invention completes the preparation of a diatomaceous earth modified water glass carbon-based electrothermal coating, realizing the preparation of inorganic mineral modified electrothermal coatings and applying them in the field of electrothermal coatings. It solves the problems of high cost, low heating efficiency and poor durability of electrothermal coatings. The process is simple, efficient and temperature controllable.

[0006] The above-mentioned technical problems are solved by the following technical solutions:

[0007] A diatomaceous earth-modified water glass carbon-based electrothermal coating is prepared by means of: 100 parts by weight of distilled water, 5-20 parts by weight of carbon-based filler, 0.5-1 parts by weight of sodium dodecyl sulfate, 1-3 parts by weight of silane coupling agent, 100-200 parts by weight of water glass, and 5-10 parts by weight of activated diatomaceous earth.

[0008] Preferably, the carbon-based filler includes at least one of the following: nano-carbon black, nano-graphite, graphene, carbon nanotubes, and fullerene.

[0009] Preferably, the activation method of the diatomaceous earth includes activating the diatomaceous earth at a high temperature of 400℃-800℃ and maintaining it for 10-30 minutes, then removing it and cooling it to room temperature for later use.

[0010] Preferably, the diatomite is of high purity or grade II or III.

[0011] Another object of the present invention is to provide a method for preparing the above-mentioned diatomaceous earth modified water glass carbon-based electrothermal coating, comprising the following steps: mixing the distilled water with carbon-based filler and sodium dodecyl sulfate in a certain proportion to obtain a first mixture;

[0012] The first mixture is mixed with the silane coupling agent and water glass in a certain proportion to obtain the second mixture;

[0013] The second mixture is mixed with diatomaceous earth in a certain proportion to obtain the diatomaceous earth modified water glass carbon-based electrothermal coating.

[0014] Preferably, when preparing the first mixture, it is stirred at a speed of 1500 rpm for 10 minutes.

[0015] Preferably, when preparing the second mixture, it is stirred at 2500 rpm for 15 minutes.

[0016] Preferably, when the second mixture is mixed with diatomaceous earth, it is stirred at a speed of 2500 rpm for 10 minutes.

[0017] The present invention also provides a diatomaceous earth modified water glass carbon-based electrothermal coating prepared using the above-mentioned diatomaceous earth modified water glass carbon-based electrothermal coating.

[0018] Another object of the present invention is to provide a method for preparing the above-mentioned diatomaceous earth modified water glass carbon-based electrothermal coating, comprising the following steps: brushing the above-mentioned diatomaceous earth modified water glass carbon-based electrothermal coating onto a sample, drying it at room temperature for 6 hours, and then heat curing it at 100-180°C for 10-30 minutes to obtain the diatomaceous earth modified water glass carbon-based electrothermal coating.

[0019] This invention uses graphene, carbon black, carbon fiber, secondary and tertiary diatomaceous earth, and water glass as main raw materials. Water glass is used as the matrix, and graphene, carbon black, and carbon fiber are used as conductive fillers to prepare an electrothermal coating, which is then incorporating high-temperature activated and modified diatomaceous earth. Compared to traditional organic electrothermal coatings, this highly active diatomaceous earth-modified water glass carbon-based electrothermal coating is an inorganic electrothermal coating. Under high-temperature heat treatment conditions, the integrated reaction of highly active diatomaceous earth and water glass is achieved, resulting in a coating with high operating temperature, low energy consumption, and good stability. This coating solves the problems of VOC emissions, low electrothermal efficiency, and high energy consumption of current organic electrothermal coatings on the market, which will undoubtedly promote the application and technological advancement of electrothermal coatings in the field of functional coatings.

[0020] The highly active diatomaceous earth-modified water glass-based carbon black electrothermal coating prepared by this invention can be widely used in construction, transportation, chemical and other fields. For example, on various road surfaces that require de-icing and snow removal, the electrothermal coating of this invention can be applied to them to complete the removal in a more time-saving and labor-saving manner, saving a lot of manpower and material costs.

[0021] In summary, the present invention has the following beneficial effects:

[0022] 1. High-temperature activation technology is used to realize high added value of secondary and tertiary diatomaceous earth utilization. By adding activated diatomaceous earth, the coating temperature is increased by 25%-30% and the power consumption is reduced by 20%-25%.

[0023] 2. In the coating preparation process, the integrated reaction preparation of highly active diatomaceous earth and water glass was realized, achieving the coating's characteristics of high operating temperature, low energy consumption, and high stability.

[0024] 3. This diatomaceous earth-modified water glass carbon-based electrothermal coating can be widely used in construction, transportation, chemical and other fields. Detailed Implementation

[0025] The invention will be described in more detail below with examples. Example 1

[0026] 1) Weigh 12 portions of diatomaceous earth and place them in a muffle furnace for high-temperature activation at 400℃. After heating to 400℃, keep it at that temperature for 30 minutes, then remove it and let it cool to room temperature before use.

[0027] 2) Add 12 parts carbon black, 1 part sodium dodecyl sulfate, and 100 parts distilled water to a mixing tank and disperse and stir at 1500 rpm for 10 minutes. Then add 100 parts water glass and 4 parts silane coupling agent to the mixing tank and disperse and stir at 2500 rpm for 15 minutes. Finally, add 12 parts activated diatomaceous earth to the mixing tank and disperse and stir at 2500 rpm for 10 minutes to complete the coating preparation. After static defoaming, brush on and dry at room temperature for 6 hours.

[0028] 3) Place the coating sample from step 2) into an oven and heat-cur it at 180°C for 10 minutes to obtain a diatomaceous earth modified water glass carbon-based electrothermal coating. Example 2

[0029] 1) Weigh 14 portions of diatomaceous earth and place them in a muffle furnace for high-temperature activation at 500℃. After heating to 500℃, keep it at that temperature for 30 minutes, then remove it and let it cool to room temperature before use.

[0030] 2) Add 14 parts carbon black, 1 part sodium dodecyl sulfate, and 100 parts distilled water to a mixing tank and disperse and stir at 1500 rpm for 10 minutes. Then add 100 parts water glass and 4 parts silane coupling agent to the mixing tank and disperse and stir at 2500 rpm for 15 minutes. Finally, add 14 parts activated diatomaceous earth to the mixing tank and disperse and stir at 2500 rpm for 10 minutes to complete the coating preparation. After static defoaming, brush on and dry at room temperature for 6 hours.

[0031] 3) Place the coating sample from step 2) into an oven and heat-cur it at 180°C for 15 minutes to obtain a diatomaceous earth modified water glass carbon-based electrothermal coating. Example 3

[0032] 1) Weigh 15 portions of diatomaceous earth and place them in a muffle furnace for high-temperature activation at 600℃. After reaching 600℃, keep the temperature for 30 minutes and then remove the earth and let it cool to room temperature before use.

[0033] 2) First, add 15 parts carbon black, 1 part sodium dodecyl sulfate, and 100 parts distilled water to a mixing tank and disperse and stir at 1500 rpm for 10 minutes. Then, add 100 parts water glass and 4 parts silane coupling agent to the mixing tank and disperse and stir at 2500 rpm for 15 minutes. Finally, add 15 parts activated diatomaceous earth to the mixing tank and disperse and stir at 2500 rpm for 10 minutes to complete the coating preparation. After static defoaming, brush on and dry at room temperature for 6 hours.

[0034] 3) Place the coating sample from step 2) into an oven and heat-cur it at 180°C for 20 minutes to obtain a diatomaceous earth modified water glass carbon-based electrothermal coating. Example 4

[0035] 1) Weigh 16 portions of diatomaceous earth and place them in a muffle furnace for high-temperature activation at 700℃. After reaching 700℃, keep the temperature for 30 minutes and then remove the earth and let it cool to room temperature before use.

[0036] 2) First, add 16 parts carbon black, 1 part sodium dodecyl sulfate, and 100 parts distilled water to a mixing tank and disperse and stir at 1500 rpm for 10 minutes. Then, add 100 parts water glass and 4 parts silane coupling agent to the mixing tank and disperse and stir at 2500 rpm for 15 minutes. Finally, add 16 parts activated diatomaceous earth to the mixing tank and disperse and stir at 2500 rpm for 10 minutes to complete the coating preparation. After static defoaming, brush on and dry at room temperature for 6 hours.

[0037] 3) Place the coating sample from step 2) into an oven and heat-cur it at 180°C for 25 minutes to obtain a diatomaceous earth modified water glass carbon-based electrothermal coating. Example 5

[0038] 1) Weigh 18 portions of diatomaceous earth and place them in a muffle furnace for high-temperature activation at 800℃. After reaching 800℃, keep the temperature for 30 minutes and then remove the earth and let it cool to room temperature before use.

[0039] 2) First, add 17 parts carbon black, 1 part sodium dodecyl sulfate, and 100 parts distilled water to a mixing tank and disperse and stir at 1500 rpm for 10 minutes. Then, add 100 parts water glass and 4 parts silane coupling agent to the mixing tank and disperse and stir at 2500 rpm for 15 minutes. Finally, add 18 parts activated diatomaceous earth to the mixing tank and disperse and stir at 2500 rpm for 10 minutes to complete the coating preparation. After static defoaming, brush on and dry at room temperature for 6 hours.

[0040] 3) Place the coating sample from step 2) into an oven and heat-cur it at 180℃ for 30 minutes to obtain a diatomaceous earth modified water glass carbon-based electrothermal coating. Example 6

[0041] The coating samples prepared in Examples 1-5 above were subjected to electrothermal performance tests under a voltage of 220V. The experimental results are shown in Table 1.

[0042] Table 1. Results of electrothermal efficiency test

[0043] Serial Number Example 1 Example 2 Example 3 Example 4 Example 5 Maximum temperature (℃) 152.7 169.6 195.9 183.3 190.2 Heating rate (°C / minute) 5.09 5.65 6.53 6.11 6.34

[0044] The above test results show that the product of this invention has high heating efficiency when energized. Furthermore, the process of this invention is simple and efficient, with extremely high cost-effectiveness, easy to industrialize, and has high practical application value, expanding the application scope of diatomaceous earth in the field of electrothermal coatings.

[0045] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A diatomaceous earth-modified water glass carbon-based electrothermal coating, characterized in that, The raw materials for preparation include: 100 parts by weight of distilled water, 5-20 parts by weight of carbon-based filler, 0.5-1 parts by weight of sodium dodecyl sulfate, 1-3 parts by weight of silane coupling agent, 100-200 parts by weight of water glass and 5-10 parts by weight of activated diatomaceous earth. The carbon-based filler includes at least one of the following: nano-carbon black, nano-graphite, graphene, carbon nanotubes, and fullerene; The activation method of the diatomaceous earth includes activating the diatomaceous earth at a high temperature of 400℃-800℃ and maintaining it for 10-30 minutes, then removing it and cooling it to room temperature for later use.

2. The diatomaceous earth-modified water glass carbon-based electrothermal coating according to claim 1, characterized in that, The specifications of the diatomite include high-purity diatomite or grade II and III diatomite.

3. The preparation method of the diatomaceous earth-modified water glass carbon-based electrothermal coating according to claim 1 or 2, characterized in that, Includes the following steps: The distilled water is mixed with carbon-based filler and sodium dodecyl sulfate in a certain proportion to obtain a first mixture; when preparing the first mixture, it is stirred at a speed of 1500 rpm for 10 minutes. The first mixture is mixed with the silane coupling agent and water glass in a certain proportion to obtain the second mixture; when preparing the second mixture, it is stirred at 2500 rpm for 15 minutes. The second mixture is mixed with diatomaceous earth in a certain proportion to obtain the diatomaceous earth modified water glass carbon-based electrothermal coating; when the second mixture is mixed with diatomaceous earth, it is stirred at a speed of 2500 / min for 10 minutes.

4. A diatomaceous earth modified water glass carbon-based electrothermal coating prepared using the diatomaceous earth modified water glass carbon-based electrothermal coating according to claim 1 or 2.

5. The method for preparing the diatomaceous earth-modified water glass carbon-based electrothermal coating according to claim 4, characterized in that, The process includes the following steps: after brushing the diatomaceous earth modified water glass carbon-based electrothermal coating of claim 1 or 2 onto a sample, drying it at room temperature for 6 hours, and then heat curing it at 100-180℃ for 10-30 minutes to obtain the diatomaceous earth modified water glass carbon-based electrothermal coating.