High-temperature-resistant coating and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant coating and a preparation method thereof. The high-temperature-resistant coating is prepared from the following raw materials in percentage by weight: 45-50% of kaolin, 25-40% of quartz powder, 10-15% of ferric oxide, 3-6% of aluminum oxide short fibers, 3-5% of titanium dioxide, a proper amount of sodium water glass and an auxiliary agent. The high-temperature-resistant coating has the beneficial effects that the sodium water glass is used as a main film-forming substance, and the kaolin, the aluminum oxide short fibers and the like are used as fillers to prepare the high-temperature-resistant coating, so that the high-temperature-resistant coating does not contain any toxic substance, and is better in environmental friendliness during use; meanwhile, the bonding strength, wear resistance and cracking resistance of the high-temperature-resistant coating after being coated on components such as steel and iron are also remarkably improved, the peeling phenomenon of the high-temperature-resistant coating is avoided, and the high-temperature-resistant coating is better in high-temperature-resistant protection performance and longer in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature resistant coatings for steel protection, and particularly to a high-temperature resistant coating and a preparation method thereof. Background Art

[0002] High-temperature resistant coatings generally refer to special functional coatings that can withstand temperatures above 380 degrees Celsius for a long time and maintain certain physical and chemical properties, enabling the protected object to function properly in a high-temperature environment. High-temperature resistant coatings are required for protecting steel components in high-temperature environments.

[0003] Currently, the high-temperature resistant coatings for protecting steel components in high-temperature environments are mainly organic chemical solvent-based coatings. Although organic solvent-based chemical coatings have certain high-temperature resistance, the raw materials of the above high-temperature resistant coatings are somewhat toxic, resulting in the emission of harmful gases during the use of high-temperature resistant coatings, polluting the environment, and thus the environmental friendliness of high-temperature resistant coatings is poor. At the same time, the adhesion, anti-cracking performance, and wear resistance of the above high-temperature resistant coatings on the surface of steel components in high-temperature environments are all poor, resulting in the easy peeling of high-temperature resistant coatings during use. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature resistant coating and a preparation method thereof to solve the above problems.

[0005] The present invention achieves the above purpose through the following technical solutions:

[0006] A high-temperature resistant coating and a preparation method thereof. The high-temperature resistant coating is composed of the following raw materials in percentage by content: 45 - 50% kaolin, 25 - 40% quartz powder, 10 - 15% iron oxide, 3 - 6% alumina short fibers, 3 - 5% titanium dioxide, and appropriate sodium silicate and additives.

[0007] Furthermore, kaolin is hydrophilic. Fine-grained kaolin can be well dispersed in most coatings because it is inherently inert and non-reactive; kaolin adheres better to the surface than mica, talc, or barium sulfate and can provide stronger covering power and better surface coating adhesion than other flakes, thereby making the coating surface smoother and denser; in addition, kaolin is also beneficial for reducing pinholes and surface cracking; more importantly, kaolin can partially replace pigments, reduce the pigment dosage, and lower the production cost.

[0008] Furthermore, the quartz powder has high activity and strong adsorption performance. At the same time, the quartz powder also acts as a curing agent and a filler in the high-temperature resistant coating; iron oxide coloring can make the coating easier to identify. At the same time, iron oxide can also improve the covering power of the high-temperature resistant coating. In addition, iron oxide can also assist other components to resist high temperature together; the alumina short fibers can improve the high-temperature resistance performance of the coating. Because the surface activity of the alumina short fibers is good, no surface treatment is required, and they have good compatibility and heat resistance. The reinforcing effect of the fibers improves the strength of the coating to a certain extent and prevents cracking after the high-temperature resistant coating is coated and dried; sodium silicate is the main film-forming substance and acts as an adhesive. Using sodium silicate as an adhesive can not only prevent cracking of the coating after the high-temperature resistant coating is coated during use, but also has a relatively low price. At the same time, the adhesiveness of sodium silicate is better than that of potassium silicate; after sodium silicate is cured, it forms a three-dimensional network film with excellent high-temperature resistance performance. The addition of alumina short fibers bears part of the stress and blocks crack propagation, which can slow down the failure of the coating at high temperatures.

[0009] Furthermore, the high-temperature resistant coating is composed of the following raw materials in percentage by content: kaolin 45.2 - 46%, quartz powder 30 - 35%, iron oxide 12 - 14%, alumina short fibers 4 - 5%, titanium dioxide 4 - 4.8%, appropriate amount of sodium silicate, and additives.

[0010] Furthermore, the high-temperature resistant coating preferably consists of the following raw materials in percentage by content: kaolin 45.5%, quartz powder 31.8%, iron oxide 13.6%, alumina short fibers 4.6%, titanium dioxide 4.6%, appropriate amount of sodium silicate, and additives.

[0011] Furthermore, the solid-liquid ratio in this high-temperature resistant coating is 1:1, and the percentage content of sodium silicate and additives in the liquid phase is 2.3%. By strictly controlling the content of sodium silicate and additives, good adhesive performance of the high-temperature resistant coating after preparation can be ensured.

[0012] Furthermore, the preparation method of this high-temperature resistant coating is as follows:

[0013] Step 1: Take kaolin, quartz powder, iron oxide, alumina short fibers, and titanium dioxide according to the optimal ratio, and sieve kaolin, quartz powder, iron oxide, alumina short fibers, and titanium dioxide respectively and then mix them to obtain the solid-phase component for standby;

[0014] Step 2: Mix sodium silicate and additives according to the optimal ratio to obtain the liquid-phase component for standby;

[0015] Step 3: Mix and stir the solid-phase component prepared in Step 1 and the liquid-phase component prepared in Step 3 according to a specific ratio until all components are uniform, then the preparation of the high-temperature resistant coating can be completed.

[0016] Furthermore, in step 1, the mixing of the solid-phase raw materials is achieved by using a blender, which can effectively improve the full mixing of the raw materials in the solid-phase components and has a higher mixing efficiency.

[0017] Furthermore, in step 3, the ratio of the solid-phase component to the liquid-phase component during mixing is 1:1.

[0018] Furthermore, the usage method of this high-temperature resistant coating is as follows: During use, first clean the surface of the steel component to be coated, and adopt a combination of spraying and rolling to achieve uniform coating of the coating on the surface of the steel component. After the coating dries, the adhesion of this high-temperature resistant coating on the surface of the steel component can be achieved.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention uses sodium silicate as the main film-forming substance and uses kaolin, alumina short fibers, etc. as fillers to prepare this high-temperature resistant coating, so that this high-temperature resistant coating does not contain any toxic substances, has better environmental protection during use, and also significantly improves the adhesion strength, wear resistance, and anti-cracking performance of this high-temperature resistant coating after being coated on components such as steel, avoids the peeling phenomenon of this high-temperature resistant coating, and makes the high-temperature resistant protection performance of this high-temperature resistant coating better and the service life longer. Description of the Drawings

[0021] Figure 1 It is a preparation flow chart of a high-temperature resistant coating and its preparation method according to the present invention. Detailed Embodiments

[0022] A high-temperature resistant coating and its preparation method, and this high-temperature resistant coating is composed of the following raw materials in percentage content: 45 - 50% kaolin, 25 - 40% quartz powder, 10 - 15% iron oxide, 3 - 6% alumina short fibers, 3 - 5% titanium dioxide, appropriate amount of sodium silicate, and additives.

[0023] In this embodiment, kaolin is hydrophilic, and fine kaolin can be well dispersed in most coatings because it is inert and non-reactive intrinsically; kaolin adheres better on the surface than mica, talc, or barium sulfate and can provide stronger covering power and better surface coating adhesion than other flakes, thereby making the coating surface smoother and denser; in addition, kaolin is also beneficial for reducing pinholes and surface cracking; more importantly, kaolin can partially replace pigments, reduce the pigment dosage, and reduce production costs.

[0024] In this embodiment, the quartz powder has high activity and strong adsorption performance. At the same time, the quartz powder also acts as a curing agent and a filler in this high-temperature resistant coating; iron oxide coloring can make the coating easier to be recognized. At the same time, iron oxide can also improve the covering power of the high-temperature resistant coating. In addition, iron oxide can also assist other components to withstand high temperatures together; alumina short fibers can improve the high-temperature resistant performance of the coating. Because the surface activity of alumina short fibers is good, no surface treatment is required, the compatibility is good, and the heat resistance is good. The reinforcing effect of the fibers improves the strength of the coating to a certain extent and prevents the cracking of the high-temperature resistant coating after coating and drying; sodium silicate is the main film-forming substance and acts as an adhesive. Using sodium silicate as an adhesive can not only prevent the coating from cracking during use after the high-temperature resistant coating is applied, but also the price is relatively cheap. At the same time, the adhesiveness of sodium silicate is better than that of potassium silicate. After sodium silicate is cured, it forms a three-dimensional network film with excellent high-temperature resistant performance. The addition of alumina short fibers bears part of the stress and blocks the crack propagation, which can slow down the failure of the coating at high temperatures.

[0025] In this embodiment, the high-temperature resistant coating is composed of the following raw materials in percentage by content: kaolin 45.2 - 46%, quartz powder 30 - 35%, iron oxide 12 - 14%, alumina short fibers 4 - 5%, titanium dioxide 4 - 4.8%, appropriate amount of sodium silicate, and additives.

[0026] In this embodiment, the high-temperature resistant coating is preferably composed of the following raw materials in percentage by content: kaolin 45.5%, quartz powder 31.8%, iron oxide 13.6%, alumina short fibers 4.6%, titanium dioxide 4.6%, appropriate amount of sodium silicate, and additives.

[0027] In this embodiment, the solid-liquid ratio in this high-temperature resistant coating is 1:1, and the percentage content of sodium silicate and additives in the liquid phase is 2.3%. By strictly controlling the content of sodium silicate and additives, it can ensure that the high-temperature resistant coating has good adhesive performance after preparation.

[0028] In this embodiment, the preparation method of this high-temperature resistant coating is as follows:

[0029] Step 1: Take kaolin, quartz powder, iron oxide, alumina short fibers, and titanium dioxide according to the optimal ratio, and sieve kaolin, quartz powder, iron oxide, alumina short fibers, and titanium dioxide respectively and then mix them to prepare the solid-phase component for standby;

[0030] Step 2: Mix sodium silicate and additives according to the optimal ratio to prepare the liquid-phase component for standby;

[0031] Step 3: Mix and stir the solid-phase component prepared in Step 1 and the liquid-phase component prepared in Step 3 according to a specific ratio until all components are uniform, then the preparation of the high-temperature resistant coating can be completed.

[0032] In this embodiment, when mixing the solid-phase raw materials in step 1, a mixer is used, which can effectively improve the full mixing of each raw material in the solid-phase components and has a higher mixing efficiency.

[0033] In this embodiment, in step 63, the ratio of the solid-phase component to the liquid-phase component during mixing is 1:1.

[0034] In this embodiment, the usage method of this high-temperature resistant coating is as follows: During use, first clean the surface of the steel component to be coated, and use a combination of spraying and rolling to achieve uniform coating of the coating on the surface of the steel component. After the coating dries, the adhesion of this high-temperature resistant coating on the surface of the steel component can be achieved.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high temperature resistant coating and a preparation method thereof, characterized in that: The high temperature resistant coating is composed of raw materials with the following percentages: 45-50% kaolin, 25-40% quartz powder, 10-15% iron oxide, 3-6% alumina short fiber, 3-5% titanium dioxide, and appropriate amounts of sodium water glass and additives.

2. A high temperature resistant coating and a preparation method thereof according to claim 1, characterized in that: The high temperature resistant coating is composed of raw materials with the following percentages: 45.2-46% kaolin, 30-35% quartz powder, 12-14% iron oxide, 4-5% alumina short fiber, 4-4.8% titanium dioxide, and appropriate amounts of sodium water glass and additives.

3. A high temperature resistant coating and a preparation method thereof according to claim 1, characterized in that: The high temperature resistant coating is preferably composed of raw materials in the following percentages: 45.5% kaolin, 31.8% quartz powder, 13.6% iron oxide, 4.6% alumina short fibers, 4.6% titanium dioxide, and appropriate amounts of sodium water glass and additives.

4. A high temperature resistant coating and a preparation method thereof according to claim 1, characterized in that: The solid-liquid ratio in this high-temperature resistant coating is 1:1, and the percentage of sodium water glass and auxiliary agent in the liquid phase is 2.3%.

5. A high temperature resistant coating and a preparation method thereof according to any one of claims 1 to 4, characterized in that: The preparation method of the high temperature resistant coating is as follows: Step 1: Take kaolin, quartz powder, iron oxide, alumina short fibers, and titanium dioxide according to the optimal ratio, and sieve and mix the kaolin, quartz powder, iron oxide, alumina short fibers, and titanium dioxide to prepare a solid phase component for later use; Step 2: Mixing sodium water glass and an auxiliary agent according to an optimal ratio to obtain a liquid phase component for standby use; Step 3: The solid phase prepared in step 1 and the liquid phase prepared in step 3 are mixed and stirred in a specific ratio until the components are uniform to complete the preparation of the high temperature resistant coating.

6. A high temperature resistant coating and a preparation method thereof according to claim 5, characterized in that: In step 1, the solid raw materials are mixed using a stirrer.

7. A high temperature resistant coating and a preparation method thereof according to claim 6, characterized in that: In step 3, the ratio of the solid phase component to the liquid phase component during mixing is 1:

1.

8. The high temperature resistant coating and preparation method thereof according to claim 5, characterized in that: The method of using this high-temperature resistant coating is as follows: when using it, first clean the surface of the steel component to be coated, and use a combination of spraying and rolling brushing to achieve uniform coating of the coating on the surface of the steel component. After the coating is dry, the high-temperature resistant coating can be adhered to the surface of the steel component.

Images