A dolomite carbide coating, its preparation method and use

Abstract

The application discloses dolomite carbonization coating and a preparation method and application thereof, and belongs to the technical field of material science. The application solves the problem that a traditional method cannot be used to synthesize at low temperature, and the preparation method is low in energy consumption, energy-saving and environment-friendly, and is expected to reduce energy waste and environmental pollution. The dolomite prepared by the application has excellent properties, such as corrosion resistance, high hardness and wear resistance, and can be applied to multiple fields, such as building and automobile coating.

Description

Technical Field

[0001] This invention belongs to the field of materials science and technology, specifically relating to a carbonized dolomite coating, its preparation method, and its application. Background Technology

[0002] The synthesis of dolomite has long been a subject of great interest in geology. Dolomite, also known as calcite, is a common carbonate mineral widely distributed throughout the Earth. However, despite its abundant deposition throughout geological history, dolomite deposition in modern marine environments is extremely limited. This seemingly simple paradox reveals a complex web of geological, chemical, and thermodynamic processes.

[0003] Dolomite has been abundant throughout geological history, forming many well-known geological features such as caves, limestone landforms, and limestone deposits. However, in modern marine environments, dolomite deposits are relatively scarce, sparking long-standing research interest among geologists. Past studies have shown that dolomite formation typically requires high-temperature, high-pressure conditions, which are drastically different from those in modern marine environments. Therefore, the origin of dolomite has remained a controversial issue. For decades, researchers have attempted to synthesize dolomite crystals in the laboratory under simulated natural conditions. However, to date, there have been almost no reports of successful synthesis of dolomite at temperatures below 100°C. Unlike typical disordered high-magnesium calcite, dolomite possesses a cationic ordered superstructure. In existing laboratory studies, ordered dolomite can only be formed through high-temperature hydrothermal experiments. This technical challenge limits our in-depth understanding of the dolomite formation mechanism, leaving many mysteries surrounding its origin.

[0004] Currently, most coatings use CaCO3 or MgCO3, while dolomite is difficult to synthesize at room temperature. Dolomite coatings have broad application prospects in the construction and engineering fields. However, existing dolomite coatings usually require high-temperature synthesis, which not only consumes a lot of energy but also limits their use in some special applications. Therefore, finding a low-energy, high-performance dolomite coating preparation method has become an urgent need in the engineering field. This patent addresses this issue by successfully solving the problem of low-temperature dolomite synthesis through an innovative preparation method, providing a completely new material selection and preparation approach for the engineering field. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing carbonized dolomite coatings.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including,

[0009] Water is added to a mixture of calcined limestone powder and natural binder, and stirred to obtain a uniform slurry.

[0010] The slurry is evenly sprayed onto the substrate, and after standing and settling naturally, the sample is placed in a carbonization tank for curing to obtain dolomite coating.

[0011] The slurry, by mass, comprises 20-80 parts calcined dolomite, 2-10 parts natural binder, and 70-120 parts water.

[0012] The mass ratio of water to calcined dolomite in the slurry is 0.8 to 1.2:1.

[0013] In a preferred embodiment of the method for preparing carbonized dolomite coating according to the present invention, the stirring is first performed at a speed of 100-150 rpm for 1-3 minutes, and then at a speed of 400-500 rpm for 4-10 minutes.

[0014] In a preferred embodiment of the method for preparing carbonized dolomite coating according to the present invention, the substrate comprises either cement board or a metal that does not react violently with water.

[0015] In a preferred embodiment of the method for preparing carbonized dolomite coating according to the present invention, the spraying process includes a nozzle diameter of 0.3–0.7 mm and a spraying pressure of 0.15–0.3 MPa.

[0016] In a preferred embodiment of the method for preparing carbonized dolomite coating according to the present invention, the spraying process includes a nozzle diameter of 0.3–1.5 mm and a spraying pressure of 0.10–0.3 MPa.

[0017] In a preferred embodiment of the method for preparing carbonized dolomite coating according to the present invention, the natural settling time is 3 to 5 hours.

[0018] As a preferred embodiment of the method for preparing carbonized dolomite coating according to the present invention, the curing conditions are: CO2 concentration of 60% to 80% and pressure of 0.15 to 0.25 MPa.

[0019] In a preferred embodiment of the method for preparing carbonized dolomite coating according to the present invention, the curing time is 24-48 hours.

[0020] In a preferred embodiment of the method for preparing carbonized dolomite coating according to the present invention, the curing time is 24 hours.

[0021] The purpose of this invention is to overcome the shortcomings of the prior art and provide a carbonized dolomite coating.

[0022] Another objective of this invention is to overcome the shortcomings of the prior art and provide an application of carbonized dolomite coating in interior and exterior wall decoration.

[0023] Beneficial effects of this invention:

[0024] 1. Challenges in low-temperature synthesis of dolomite: Traditional methods cannot synthesize dolomite under low-temperature conditions, while this method successfully achieves the preparation of carbonized dolomite at room temperature.

[0025] 2. Demand for improved coating performance: The market demand for high-performance coatings is constantly increasing, and the carbonized dolomite coating provided by this patent meets this demand.

[0026] 3. Energy-saving and environmentally friendly, ultra-low energy consumption: The low energy consumption of the preparation method and the high performance of the coating make it meet the requirements of energy conservation and environmental protection, and are expected to reduce energy waste and environmental pollution. Including corrosion resistance, high hardness and wear resistance, it can be applied in many fields, such as construction and automotive coating. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0028] Figure 1 The image shows the carbonized dolomite product prepared according to Embodiment 1 of the present invention. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0032] Unless otherwise specified, all raw materials used in this invention are commercially available.

[0033] The materials obtained in the embodiments of the present invention were subjected to performance testing according to the following method:

[0034] The adhesion strength was tested using a BGD500S pull-off adhesion tester.

[0035] The wear measurement was performed using a BGD523 paint film abrasion tester.

[0036] The salt water resistance, alkali resistance and water resistance of the coatings were tested according to GB / T 9274-1988.

[0037] Example 1

[0038] This embodiment provides a method for preparing carbonized dolomite coating, specifically as follows:

[0039] 50g of dolomite with a particle size of 200 mesh, calcined at 950℃ for 5 min, was selected. The calcined dolomite powder was mixed evenly with 2.5g (5%) of cellulose, and then 50g (1:1) of deionized water was added. The mixture was stirred manually at 120 rpm for 2 min to ensure thorough wetting. Then, the mixture was stirred for another 5 min at 450 rpm to obtain a uniform slurry. Next, the prepared slurry was evenly sprayed onto a pre-prepared cement slab at a spray pressure of 0.2 MPa and a nozzle diameter of 0.5 mm. After spraying, the slurry was allowed to stand for 4 h to allow it to settle naturally, ensuring that there was no obvious moisture on the coating surface. Subsequently, the settled sample was placed in a carbonization tank and cured for 24 h under conditions of 80% CO2 concentration and 0.2 MPa pressure to promote the hardening and strength development of the dolomite coating, ultimately producing the dolomite coating.

[0040] Example 2

[0041] The difference between this embodiment and Embodiment 1 is that the CO2 curing pressure is adjusted from 0.2 MPa to 0.25 MPa, while the rest of the preparation process is the same as in Embodiment 1, and a dolomite coating is obtained.

[0042] Example 3

[0043] The difference between this embodiment and Embodiment 1 is that the CO2 curing pressure is adjusted from 0.2 MPa to 0.15 MPa, while the rest of the preparation process is the same as in Embodiment 1, and a dolomite coating is obtained.

[0044] The performance of the materials prepared in the above embodiments was tested, and the comparison results with those of Example 1 are shown in Table 1.

[0045] Table 1

[0046]

[0047] As can be seen from the table above, adjusting the CO2 curing pressure has a significant impact on the performance of dolomite coatings. This is because at lower CO2 curing pressures, CO2 does not easily penetrate into the interior of the coating and reacts with more components, resulting in performance that is not as good as at a curing pressure of 0.2 MPa. On the other hand, when the pressure is too high, the reaction may be too fast, leading to uneven distribution of the generated products and pores, thus affecting the performance of the coating. According to the results in the table above, the best technical effect can be obtained when the CO2 curing pressure in this invention is 0.2 MPa.

[0048] Example 4

[0049] The difference between this embodiment and Embodiment 1 is that the ratio of water to dolomite is adjusted from 1:1 to 1.2:1, while the rest of the preparation process is the same as in Embodiment 1, to obtain a dolomite coating.

[0050] Example 5

[0051] The difference between this embodiment and Embodiment 1 is that the ratio of water to dolomite is adjusted from 1:1 to 0.8:1, while the rest of the preparation process is the same as in Embodiment 1, to obtain a dolomite coating.

[0052] The performance of the materials prepared in the above embodiments was tested, and the results compared with those of Example 1 are shown in Table 2.

[0053] Table 2

[0054]

[0055] As can be seen from the table above, adjusting the ratio of water to dolomite has a significant impact on the performance of dolomite coatings. This is because when the water content is too high, the coating may be too thin and have excessive fluidity, resulting in a loose coating structure; while when the water content is too low, the reaction rate may slow down, leading to incomplete coating curing and thus affecting its performance. At a 1:1 ratio, the chemical reaction between water and dolomite reaches equilibrium, resulting in a coating with suitable consistency and fluidity, capable of forming a uniform and dense coating structure. According to the results in the table above, the optimal technical effect can be obtained when the water-to-dolomite ratio in this invention is 1:1.

[0056] Example 6

[0057] The difference between this embodiment and Example 1 is that the cellulose is changed to starch, while the rest of the preparation process is the same as in Example 1, and a dolomite coating is obtained.

[0058] The performance of the materials prepared in the above embodiments was tested, and the comparison results with those of Example 1 are shown in Table 3.

[0059] Table 3

[0060]

[0061] As shown in the table above, adjusting the type of binder has a significant impact on the performance of dolomite coatings. This is because cellulose is a natural high-molecular-weight organic substance with high crystallinity and a fibrous structure, which gives it excellent mechanical properties such as high strength, high toughness, and good wear resistance. In coatings, cellulose can enhance the tensile strength of the coating, improve its wear resistance, and ensure that the coating maintains stability and durability during use. In contrast, although starch is also a high-molecular-weight substance, its structure is mostly in granular form and has lower crystallinity, resulting in relatively poor mechanical properties, insufficient toughness, and higher brittleness. Therefore, adding starch to coatings may not significantly improve the tensile strength, corrosion resistance, and wear resistance of the coating as much as cellulose. According to the results in the table above, the best technical effect can be obtained when cellulose is used as the binder in this invention.

[0062] Comparative Example 1

[0063] This comparative example provides a traditional method for preparing dolomite coatings, specifically:

[0064] 50g of 200-mesh dolomite, 3g of binder, and 1g of water-reducing agent were selected and mixed evenly. Then, 20g of deionized water was added and the mixture was stirred manually at 120 rpm for 2 minutes to ensure thorough wetting. Next, the mixture was stirred with a mixer at 450 rpm for 5 minutes to obtain a uniform slurry. Then, the prepared slurry was evenly sprayed onto a pre-prepared cement slab using a spraying pressure of 0.2 MPa and a spray gun nozzle diameter of 0.5 mm. After spraying, the slurry was allowed to stand for 4 hours to settle naturally, thus obtaining the dolomite coating.

[0065] Comparative Example 2

[0066] The difference between this comparative example and Example 1 is that the natural binder cellulose is not added, while the rest of the preparation process is the same as in Example 1, resulting in a dolomite coating.

[0067] The performance of the materials prepared in the above comparative example was tested, and the results compared with those of Example 1 are shown in Table 4.

[0068] Table 4

[0069]

[0070] As shown in the table above, the traditional methods for preparing dolomite coatings are inferior in performance to the dolomite coating prepared by this invention. This is because pure dolomite powder cannot achieve adhesive properties by generating a cementitious material in situ; it can only achieve physical adhesion through an adhesive. In contrast, the calcined dolomite used in this invention allows for two advantages: firstly, the uncalcined dolomite can act as a filler to enhance the coating's performance; secondly, the MgO and CaO in the calcined dolomite form a cementitious material after hydration and carbonization, thereby enhancing its adhesiveness to meet the coating's requirements. Therefore, the advantages of this invention are evident from the data in the table above. Furthermore, the materials and reagents used in this invention are all green and harmless, and will not have any impact on the environment.

[0071] In summary, this invention solves the problem of traditional methods being unable to synthesize the dolomite under low-temperature conditions. Furthermore, the preparation method is energy-efficient and environmentally friendly, potentially reducing energy waste and environmental pollution. The dolomite prepared by this invention possesses excellent properties including corrosion resistance, high hardness, and wear resistance, and can be applied in multiple fields, such as construction and automotive painting.

[0072] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing a carbonized dolomite coating, characterized in that: include, Water is added to a well-mixed calcined dolomite and natural binder, and stirred to obtain a uniform slurry; The slurry is evenly sprayed onto the substrate, and after standing and settling naturally, the sample is placed in a carbonization tank for curing to obtain dolomite coating. The slurry, by mass, comprises 20-80 parts calcined dolomite, 2-10 parts natural binder, and 70-120 parts water; The mass ratio of water to calcined dolomite in the slurry is 0.8~1.2:1; The natural adhesive is cellulose; The maintenance conditions are: CO2 concentration of 60%~80% and pressure of 0.15~0.25MPa; The curing time is 24-48 hours.

2. The method for preparing carbonized dolomite coating as described in claim 1, characterized in that: The stirring is performed by first stirring at a speed of 100-150 rpm for 1-3 minutes, and then stirring at a speed of 400-500 rpm for 4-10 minutes.

3. The method for preparing the carbonized dolomite coating as described in claim 1, characterized in that: The substrate includes either cement slabs or a metal that does not react violently with water.

4. The method for preparing the carbonized dolomite coating as described in claim 1, characterized in that: The spraying process includes a nozzle diameter of 0.3~1.5mm and a spraying pressure of 0.10~0.3MPa.

5. The method for preparing carbonized dolomite coating as described in claim 1, characterized in that: The natural settling time is 3-5 hours.

6. The carbonized dolomite coating prepared by the method described in any one of claims 1 to 5.

7. The application of the carbonized dolomite coating as described in claim 6 in interior and exterior wall decoration.

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