High temperature resistant heat insulation coating, preparation method and fire fighting robot

Abstract

The present invention discloses a high temperature resistant heat insulating coating, a preparation method and a fire fighting robot. The coating is prepared by mixing a plurality of high temperature resistant inorganic materials. The thermal conductivity of the coating is reduced by introducing materials such as silicon micropowder, hollow glass fiber, hollow ceramic microbeads and silicon carbide. At the same time, an air entraining agent is added to increase the porosity of the coating, further reduce the thermal conductivity and delay heat transfer. The present invention forms a micro-nano scale combination of powders of different sizes with hollow glass fiber powder and flat glass fiber powder to improve the impact strength of the coating, and improves the bonding strength between the coating and the steel substrate through high temperature sintering. The high temperature resistant heat insulating coating is applied to the surface of the steel substrate of the fire fighting robot and sintered at high temperature to ensure that the fire fighting robot can work in a high temperature environment for a long time.

Description

Technical Field

[0001] The invention relates to a high temperature resistant heat insulating coating, a preparation method and a fire fighting robot, and belongs to the technical field of high temperature resistant heat insulating coatings. Background Art

[0002] Firefighting robots are a type of special robot that plays an increasingly important role in firefighting and emergency rescue. Firefighting robots often need to enter high-temperature fire scenes to operate, so the surface of their outer protective steel plates needs to be coated with high-temperature resistant thermal insulation protective coatings, which must have high impact resistance. High-temperature resistant thermal insulation coatings are a type of coating that can withstand high-temperature environments and has a low thermal conductivity, and can achieve the effect of thermal insulation. Existing metal thermal insulation cold spray high-temperature resistant coatings are mostly prepared using conventional thermal insulation materials, such as sepiolite, expanded vermiculite, etc. This type of coating has a large thickness, high thermal conductivity, and poor bonding strength. In addition, nano-ceramic composite coatings, after spraying, are sintered at high temperature to form a dense ceramic coating, which has excellent high-temperature resistance but insufficient thermal insulation performance. The insufficient thickness of the ceramic thermal insulation coating makes it difficult to ensure that the firefighting robot can work in a high-temperature environment for a long time. Therefore, it is urgent to develop a coating with good high-temperature resistance, low thermal conductivity, and high bonding strength with the steel substrate to meet the operational needs of the firefighting robot.

[0003] Chinese invention patent CN106085093B discloses a high-temperature resistant and efficient thermal insulation coating, its preparation method and a high-temperature resistant and efficient thermal insulation material. The invention discloses a high-temperature resistant multifunctional composite powder prepared by surface coating modification technology, which has the advantages of low thermal conductivity, high thermal reflectivity, high flowability, etc.; and the water-soluble high-temperature adhesive synthesized by organic-inorganic crosslinking combination technology has the advantages of good film-forming properties, strong adhesion, high temperature resistance, environmental protection and non-toxicity, etc.; the obtained thermal insulation coating has a temperature resistance range of -80℃ to 1600℃, which is suitable for various substrates such as ceramics, glass, and metal, but its coating thickness is only 0.1-0.5mm, and it cannot maintain the thermal insulation effect for a long time. Summary of the invention

[0004] The purpose of the present invention is to provide a high-temperature resistant heat-insulating coating, a preparation method and a fire-fighting robot. A layer of high-temperature resistant heat-insulating coating is coated on the surface of the fire-fighting robot. The coating is prepared by mixing a variety of high-temperature resistant inorganic materials. After being coated on the surface of the outer protective steel plate of the fire-fighting robot, it is dried and sintered at high temperature. By introducing materials such as silicon micropowder, hollow glass fiber, hollow ceramic microbeads and silicon carbide, and adding an air entraining agent, the porosity of the coating is increased, the thermal conductivity is reduced, and heat transfer is delayed. Infrared shielding agents are added to reduce thermal radiation. Powders of different sizes form a micro-nano scale combination with hollow glass fiber powder and flat glass fiber powder, thereby improving the impact strength of the coating and enhancing the bonding strength between the coating and the steel substrate.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] On the one hand, the present invention provides a high-temperature resistant heat-insulating coating, comprising the following components in parts by mass: 11-20 parts of aluminum silicate, 10-25 parts of aluminum powder, 10-20 parts of aluminum oxide, 5-10 parts of hollow ceramic microbeads, 5-10 parts of silicon micropowder, 5-10 parts of silicon carbide, 5-15 parts of hollow glass fiber powder, 3-5 parts of flat glass fiber powder, 2-5 parts of infrared shielding agent, 0.2-0.6 parts of air entraining agent, 1-3 parts of thickener and 15-25 parts of deionized water.

[0007] Furthermore,

[0008] The aluminum silicate particle size is 2-5um;

[0009] The aluminum powder particle size is 50-80nm;

[0010] The alumina particle size is 5-15um;

[0011] The hollow ceramic microspheres are alumina ceramics with a particle size of 1000-1500 mesh;

[0012] The silicon micropowder is porous silicon micropowder with a particle size of 0.5-1um;

[0013] The silicon carbide is silicon carbide aerogel powder with a particle size of 2-8um.

[0014] Furthermore,

[0015] The hollow glass fiber powder has a length of 0.2-0.5 mm, a diameter of 30-70 μm, and a hollowness of 50%-65%;

[0016] The flat glass fiber powder has a length of 0.1-0.3 mm, a width of 15-28 um, and a thickness of 3-8 um.

[0017] Furthermore, the infrared shielding agent is one or both of potassium hexatitanate whiskers and rutile titanium dioxide, with a particle size of 2000-3000 mesh.

[0018] Further, the air entraining agent is sodium rosinate;

[0019] The thickener is magnesium aluminum silicate.

[0020] A second aspect of the present invention provides a method for preparing a high temperature resistant heat insulating coating, comprising the following steps:

[0021] S1. Weigh deionized water, aluminum silicate powder and air entraining agent according to the above-mentioned mass fractions, stir and mix them evenly to obtain a mixed solution;

[0022] S2. Weigh aluminum powder, alumina, hollow ceramic microbeads, silicon micropowder, silicon carbide, hollow glass fiber powder, flat glass fiber powder and infrared shielding agent according to the above-mentioned mass fractions, put them into a high-speed mixer and stir them evenly to obtain a mixed powder;

[0023] S3. Weigh the thickener according to the aforementioned mass fraction, add the mixed powder obtained in step S2 and the weighed thickener into the mixed solution in step S1, stir and mix, and obtain a high temperature resistant heat insulating coating.

[0024] Furthermore, in step S1, the stirring speed is 200-400 r / min, and the stirring time is 30-45 min.

[0025] Furthermore, in step S3, the stirring speed is 500-1000 r / min, and the stirring time is 10-15 min.

[0026] A third aspect of the present invention provides a fire-fighting robot, wherein the surface of the outer steel substrate of the fire-fighting robot is coated with a high-temperature resistant heat-insulating coating, wherein the high-temperature resistant heat-insulating coating is coated with a high-temperature resistant heat-insulating coating, and the high-temperature resistant heat-insulating coating is prepared by the above-mentioned preparation method of the high-temperature resistant heat-insulating coating;

[0027] The outer steel substrate of the fire-fighting robot includes: an outer protective steel plate of the fire-fighting robot and exposed transmission components.

[0028] Furthermore, the coating method of the high temperature resistant heat insulation coating is:

[0029] A1. Surface treatment of the outer protective steel substrate of the fire-fighting robot, including pickling, grinding, washing and drying;

[0030] A2. Spraying the high temperature resistant heat insulation coating onto the surface of the outer protective steel substrate of the fire fighting robot after surface treatment;

[0031] A3. After drying, high temperature sintering and cooling are performed to obtain a high temperature resistant heat insulation coating;

[0032] A4. Return to step A2 to spray, dry and sinter again according to the insulation requirements.

[0033] Furthermore, in A2, the spraying temperature is room temperature, and the spraying pressure is 5-8 MPa.

[0034] Furthermore, in A3, the drying temperature is 50-80°C.

[0035] Furthermore, in A3, during the sintering process, the heating rate is 2-5°C / min, from room temperature to 1000-1200°C;

[0036] After heating is completed, keep warm for 100-150 minutes and then cool.

[0037] Furthermore, in the coating process, after a single coating and sintering, the thickness of the high temperature resistant heat insulation coating is 0.3-1 mm;

[0038] After multiple spraying, drying and sintering, the maximum thickness of the high temperature resistant heat insulation coating is 15mm.

[0039] The fourth aspect of the present invention provides a steel substrate surface protection structure, including a high-temperature resistant thermal insulation coating, which is coated on the surface of the steel substrate. The high-temperature resistant thermal insulation coating adopts a high-temperature resistant thermal insulation coating, and the high-temperature resistant thermal insulation coating is prepared by the aforementioned preparation method of the high-temperature resistant thermal insulation coating.

[0040] The beneficial effects of the present invention are:

[0041] The present invention provides a high-temperature resistant heat-insulating coating and a fire-fighting robot. The coating is prepared by mixing a plurality of high-temperature resistant inorganic materials. The coating is coated on the surface of an outer protective steel plate of a fire-fighting robot and then dried and sintered at high temperature. The thermal conductivity of the coating is reduced by introducing materials such as silicon micropowder, hollow glass fiber, hollow ceramic microbeads and silicon carbide. At the same time, an air entraining agent is added to increase the porosity of the coating, further reduce the thermal conductivity, and delay heat transfer. An infrared shielding agent is added to reduce thermal radiation. The present invention forms a micro-nano scale combination of powders of different sizes with hollow glass fiber powder and flat glass fiber powder to improve the impact strength of the coating. The bonding strength between the coating and a steel substrate is improved by high-temperature sintering.

[0042] The present invention applies high temperature resistant heat insulating coating to the surface of steel substrate of fire fighting robot, and the thickness of single coating and sintering is 0.3-1mm. The coating thickness can be coated and sintered multiple times according to the insulation requirements, and the maximum thickness can reach 15mm, which can ensure that the fire fighting robot can work in high temperature environment for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 The cross-sectional structure of a steel substrate coated with a high-temperature resistant heat-insulating coating provided by the present invention. DETAILED DESCRIPTION

[0044] The present invention is further described below. The following examples are only used to more clearly illustrate the technical solution of the present invention, and are not intended to limit the protection scope of the present invention.

[0045] The first aspect of the present invention provides a high temperature resistant heat insulating coating, comprising the following components in parts by mass: 11-20 parts of aluminum silicate, 10-25 parts of aluminum powder, 10-20 parts of aluminum oxide, 5-10 parts of hollow ceramic microspheres, 5-10 parts of silicon micropowder, 5-10 parts of silicon carbide, 5-15 parts of hollow glass fiber powder, 3-5 parts of flat glass fiber powder, 2-5 parts of infrared shielding agent, 0.2-0.6 parts of air entraining agent, 1-3 parts of thickener and 15-25 parts of deionized water.

[0046] Preferably, the aluminum silicate is ultrafine aluminum silicate with a particle size of 2-5 um.

[0047] Preferably, the particle size of the aluminum powder is 50-80 nm.

[0048] Preferably, the alumina is alumina powder with a particle size of 5-15 um.

[0049] Preferably, the hollow ceramic microspheres are alumina ceramics with a particle size of 1000-1500 mesh.

[0050] Preferably, the silicon micropowder is porous silicon micropowder with a particle size of 0.5-1 um.

[0051] Preferably, the silicon carbide is silicon carbide aerogel powder with a particle size of 2-8 um.

[0052] Preferably, the hollow glass fiber powder has a length of 0.2-0.5 mm, a diameter of 30-70 um, and a hollowness of 50%-65%.

[0053] Preferably, the flat glass fiber powder has a length of 0.1-0.3 mm, a width of 15-28 um, and a thickness of 3-8 um.

[0054] Preferably, the infrared shielding agent is one or both of potassium hexatitanate whiskers and rutile titanium dioxide, with a particle size of 2000-3000 mesh.

[0055] Preferably, the air entraining agent is sodium rosinate.

[0056] Preferably, the thickener is magnesium aluminum silicate.

[0057] The second aspect of the present invention provides a method for preparing a high temperature resistant thermal insulation coating, which is used to prepare the high temperature resistant thermal insulation coating in Example 1. The specific steps of the preparation method are as follows:

[0058] S1. Weigh deionized water, aluminum silicate powder and air entraining agent according to the mass fractions in Example 1, stir and mix them evenly to obtain a mixed solution;

[0059] S2. Weigh aluminum powder, aluminum oxide, hollow ceramic microbeads, silicon micropowder, silicon carbide, hollow glass fiber powder, flat glass fiber powder and infrared shielding agent according to the mass fractions in Example 1, put them into a high-speed mixer and stir them evenly to obtain a mixed powder;

[0060] S3. Weigh the thickener according to the mass fraction in Example 1, add the mixed powder obtained in step S2 and the weighed thickener into the mixed solution obtained in step S1, stir and mix, and obtain a high temperature resistant heat insulating coating.

[0061] Preferably, in step S1, the stirring speed is 200-400 r / min, and the stirring time is 30-45 min.

[0062] Preferably, in step S3, the stirring speed is 500-1000 r / min, and the stirring time is 10-15 min.

[0063] A third aspect of the present invention provides a fire-fighting robot, wherein a high-temperature resistant heat-insulating coating is coated on the surface of an outer steel substrate of the fire-fighting robot, and the coating method of the high-temperature resistant heat-insulating coating is as follows:

[0064] A1. Surface treatment of the outer protective steel substrate of the fire-fighting robot, including pickling, grinding, water washing and drying, to improve the surface roughness;

[0065] A2, spraying the high temperature resistant heat insulating coating prepared by the method of steps S1-S3 onto the surface of the surface treated steel substrate;

[0066] A3. Drying after spraying;

[0067] A4. After complete drying, place the steel substrate in a sintering furnace protected by a nitrogen atmosphere for high-temperature sintering and then cool to obtain a high-temperature resistant heat-insulating coating on the surface of the steel substrate.

[0068] A5. Return to step A2 to spray, dry and sinter again according to the insulation requirements.

[0069] Preferably, in step A2, the spraying temperature is room temperature and the spraying pressure is 5-8 MPa.

[0070] Preferably, in step A3, the drying temperature is 50-80°C.

[0071] Preferably, in step A4, during the sintering process, the heating rate is 2-5°C / min, from room temperature to 1000-1200°C.

[0072] Preferably, in step A4, after the heating is completed, the temperature is kept for 100-150 minutes and then cooled.

[0073] It should be noted that the outer steel substrate of the fire-fighting robot includes: the fire-fighting robot's outer protective steel plate, exposed transmission components and other steel substrate components that require heat insulation protection.

[0074] It should be noted that the thickness of a single coating and sintering is 0.3-1mm, and the coating thickness can be coated and sintered multiple times according to the insulation needs, up to a maximum of 15mm.

[0075] A fourth aspect of the present invention provides a steel substrate surface protection structure, comprising a high temperature resistant heat insulating coating, which is coated on the surface of the steel substrate in the coating method of steps A1-A5 above.

[0076] After coating, the structure is as follows Figure 1 As shown in the figure, 1 is a steel substrate and 2 is a high temperature resistant heat insulation coating.

[0077] Example 1

[0078] This embodiment provides a steel substrate surface protection structure, including a high temperature resistant heat insulation coating, which is coated on the surface of the steel substrate in the following manner:

[0079] B1. Prepare high temperature resistant heat insulation coating as follows:

[0080] B11, weigh 20 parts of deionized water, 15 parts of aluminum silicate powder and 0.4 parts of air entraining agent, stir and mix them evenly, stir at a speed of 200 r / min for 35 min, and obtain a mixed solution;

[0081] B12, weigh 11 parts of aluminum powder, 17 parts of aluminum oxide, 6 parts of hollow ceramic microspheres, 7 parts of silicon powder, 8 parts of silicon carbide, 6 parts of hollow glass fiber powder, 4 parts of flat glass fiber powder and 4 parts of infrared shielding agent, put them into a high-speed mixer and stir them evenly to obtain a mixed powder;

[0082] B13. Weigh 1.6 parts of thickener, add the mixed powder obtained in step B12 and the weighed thickener to the mixed liquid obtained in step B11, stir and mix at a speed of 600 r / min for 10 minutes to obtain a high-temperature resistant heat-insulating coating.

[0083] It should be noted that, in the above-mentioned preparation process, the selection criteria of each component refer to the components of the high-temperature resistant thermal insulation coating disclosed above.

[0084] B2. Surface treatment of the steel substrate, including pickling, grinding, washing and drying, to improve surface roughness;

[0085] B3, spraying the high temperature resistant heat insulating coating prepared in step B1 onto the surface of the surface treated steel substrate at room temperature and a spraying pressure of 7 MPa;

[0086] B4. After spraying, dry the coating at 60℃.

[0087] B5. After complete drying, the steel substrate is placed in a sintering furnace protected by a nitrogen atmosphere for high-temperature sintering at a heating rate of 2°C / min from room temperature to 1100°C. After 120 minutes of heat preservation, the steel substrate is cooled to obtain a high-temperature resistant heat-insulating coating with a thickness of 1 mm on the surface of the steel substrate.

[0088] B6. Return to step B3, and spray, dry and sinter again until a high temperature resistant heat insulating coating with a thickness of 10 mm is obtained on the surface of the steel substrate.

[0089] Example 2

[0090] This embodiment provides another steel substrate surface protection structure, including a high temperature resistant heat insulation coating, which is coated on the surface of the steel substrate in the following manner:

[0091] C1. Prepare high temperature resistant heat insulation coating as follows:

[0092] C11, weigh 22 parts of deionized water, 12 parts of aluminum silicate powder and 0.5 parts of air entraining agent, stir and mix them evenly, stir at a speed of 300 r / min for 35 min, and obtain a mixed solution;

[0093] C12, weigh 15 parts of aluminum powder, 10 parts of aluminum oxide, 8 parts of hollow ceramic microspheres, 7 parts of silicon micropowder, 8 parts of silicon carbide, 8 parts of hollow glass fiber powder, 3 parts of flat glass fiber powder and 5 parts of infrared shielding agent, put them into a high-speed mixer and stir them evenly to obtain a mixed powder;

[0094] C13. Weigh 1.5 parts of thickener, add the mixed powder obtained in step C12 and the weighed thickener to the mixed liquid obtained in step C11, stir and mix at a speed of 800 r / min for 15 minutes, and a high-temperature resistant heat-insulating coating can be obtained.

[0095] It should be noted that, in the above-mentioned preparation process, the selection criteria of each component refer to the components of the high-temperature resistant thermal insulation coating disclosed above.

[0096] C2. Surface treatment of the steel substrate, including pickling, grinding, washing and drying, to improve surface roughness;

[0097] C3, spraying the high temperature resistant heat insulating coating prepared in step C1 onto the surface of the surface treated steel substrate at room temperature and a spraying pressure of 5 MPa;

[0098] C4. Drying after spraying, the drying temperature is 60℃;

[0099] C5. After complete drying, the steel substrate is placed in a sintering furnace protected by a nitrogen atmosphere for high-temperature sintering at a heating rate of 2°C / min from room temperature to 1100°C. After 120 minutes of heat preservation, the steel substrate is cooled to obtain a high-temperature resistant heat-insulating coating with a thickness of 1 mm on the surface of the steel substrate.

[0100] C6. Return to step C3, and spray, dry and sinter again until a high temperature resistant heat insulating coating with a thickness of 10 mm is obtained on the surface of the steel substrate.

[0101] Example 3

[0102] The present embodiment provides a fire-fighting robot, the surface of the outer steel substrate of the fire-fighting robot is coated with a high-temperature resistant thermal insulation coating, and the coating component ratio, coating preparation method, coating method and high-temperature resistant thermal insulation coating thickness of the high-temperature resistant thermal insulation coating are the same as those in Example 1.

[0103] It should be noted that the outer steel base material of the fire-fighting robot includes the outer protective steel plate, exposed transmission parts and other steel materials of the fire-fighting robot.

[0104] Example 4

[0105] The present embodiment provides a fire-fighting robot, the surface of the outer steel substrate of the fire-fighting robot is coated with a high-temperature resistant thermal insulation coating, and the coating component ratio, coating preparation method, coating method and high-temperature resistant thermal insulation coating thickness of the high-temperature resistant thermal insulation coating are the same as those in Example 2.

[0106] It should be noted that the outer steel base material of the fire-fighting robot includes the outer protective steel plate, exposed transmission parts and other steel materials of the fire-fighting robot.

[0107] Comparative Example 1

[0108] This comparative example provides a steel substrate surface protection structure, including a high-temperature resistant thermal insulation coating, which is coated on the surface of the steel substrate. The coating component ratio, coating preparation method, coating method and high-temperature resistant thermal insulation coating thickness of the high-temperature resistant thermal insulation coating are the same as those of Example 1, except that hollow glass fiber powder and flat glass fiber powder are not added. Other than that, all other aspects are the same.

[0109] Comparative Example 2

[0110] This comparative example provides a fire-fighting robot. Compared with Example 3, the coating component ratio, coating preparation method, coating method and thickness of the high-temperature resistant thermal insulation coating of this comparative example are the same as those of Example 3, except that hollow glass fiber powder and flat glass fiber powder are not added. Other than that, all other aspects are the same.

[0111] The comparative performance of high temperature resistance and heat insulation of the above-mentioned Examples 1-4 and Comparative Examples 1-2 is shown in Table 1 below.

[0112] Table 1 Comparison results of high temperature resistant heat insulation coatings of Examples 1-4 and Comparative Examples 1-2

[0113]

[0114]

[0115] The adhesion shall refer to GB / T 1720-2020 Determination of paint film adhesion; the thermal conductivity shall be measured in accordance with GB / T 17106-1997; the impact strength of the coating shall refer to GB / T 1732-2020 Determination of paint film impact resistance.

[0116] From Example 1, Example 2 and Comparative Example 1 in Table 1, it can be seen that adding hollow glass fiber powder and flat glass fiber powder can effectively improve the impact strength and thermal conductivity of the coating. From Example 3, Example 4 and Comparative Example 2, it can be seen that hollow glass fiber powder and flat glass fiber powder can improve the long-term thermal insulation effect.

[0117] Explanation of terms

[0118] Air-entraining agent: also known as aerating agent, is a hydrophobic surfactant that can produce a large number of tiny bubbles during the stirring process after being dissolved in water.

[0119] The above embodiments are only some embodiments of the present invention, not all embodiments. On this basis, the components and ratios of the thermal insulation protective coating can be adjusted according to actual needs, and the materials, preparation methods and other processes include but are not limited to the above embodiments. Although the above embodiments have described the present invention and its advantages in detail, it should be understood that various changes, substitutions and transformations can be made without exceeding the spirit and scope of the present invention as defined by the attached claims. A person of ordinary skill in the art will easily understand from the disclosure of the present invention that according to the present invention, existing and future ratios, combinations or preparation methods to be developed that perform substantially the same functions as the corresponding embodiments described herein or obtain substantially the same functions as the corresponding embodiments described herein can be used. Therefore, the attached claims are intended to include such ratios, preparation processes, etc. within their scope.

Claims

1. A high temperature resistant heat insulating coating, characterized in that: The invention comprises the following components in parts by weight: 11-20 parts of aluminum silicate, 10-25 parts of aluminum powder, 10-20 parts of aluminum oxide, 5-10 parts of hollow ceramic microspheres, 5-10 parts of silicon micropowder, 5-10 parts of silicon carbide, 5-15 parts of hollow glass fiber powder, 3-5 parts of flat glass fiber powder, 2-5 parts of infrared shielding agent, 0.2-0.6 parts of air entraining agent, 1-3 parts of thickener and 15-25 parts of deionized water; The hollow glass fiber powder has a length of 0.2-0.5 mm, a diameter of 30-70 um, and a hollowness of 50%-65%; The flat glass fiber powder has a length of 0.1-0.3 mm, a width of 15-28 um, and a thickness of 3-8 um; The aluminum silicate particle size is 2-5um; The aluminum powder particle size is 50-80nm; The alumina particle size is 5-15um; The hollow ceramic microspheres are alumina ceramics with a particle size of 1000-1500 mesh; The silicon micropowder is porous silicon micropowder with a particle size of 0.5-1um; The silicon carbide is silicon carbide aerogel powder with a particle size of 2-8um; The infrared shielding agent is one or both of potassium hexatitanate whiskers and rutile titanium dioxide, with a particle size of 2000-3000 mesh; The coating method of the high temperature resistant heat insulation coating is: A1. Surface treatment of the outer protective steel substrate of the fire-fighting robot, including pickling, grinding, water washing and drying; A2. Spraying the high temperature resistant heat insulation coating onto the surface of the outer protective steel substrate of the fire fighting robot after surface treatment; A3. After drying, high temperature sintering and cooling are performed to obtain a high temperature resistant heat insulation coating; During the sintering process, the temperature is raised at a rate of 2-5°C / min from room temperature to 1000-1200°C. After the temperature is raised, the material is kept at this temperature for 100-150 minutes before cooling. A4. Return to step A2 to spray, dry and sinter again according to the insulation requirements.

2. A high temperature resistant heat insulating coating according to claim 1, characterized in that: The air entraining agent is sodium rosinate; The thickener is magnesium aluminum silicate.

3. The method for preparing the high temperature resistant heat insulating coating according to any one of claims 1 or 2, characterized in that: The following steps are involved: S1. Weigh deionized water, aluminum silicate powder and air entraining agent in the mass fractions as described in claim 1, stir and mix them evenly to obtain a mixed solution; S2. Weigh aluminum powder, alumina, hollow ceramic microbeads, silicon micropowder, silicon carbide, hollow glass fiber powder, flat glass fiber powder and infrared shielding agent according to the mass fractions described in claim 1, put them into a high-speed mixer and stir them evenly to obtain a mixed powder; S3. Weigh the thickener according to the mass fraction described in claim 1, add the mixed powder obtained in step S2 and the weighed thickener into the mixed solution of step S1, stir and mix, and obtain a high temperature resistant heat insulating coating.

4. The method for preparing a high temperature resistant heat insulating coating according to claim 3, characterized in that: In step S1, the stirring speed is 200-400 r / min, and the stirring time is 30-45 min.

5. The method for preparing a high temperature resistant heat insulating coating according to claim 3, characterized in that: In step S3, the stirring speed is 500-1000 r / min, and the stirring time is 10-15 min.

6. A firefighting robot, characterized in that: The surface of the outer steel substrate of the fire-fighting robot is coated with a high-temperature resistant heat-insulating coating, and the high-temperature resistant heat-insulating coating is coated with a high-temperature resistant heat-insulating coating, and the high-temperature resistant heat-insulating coating is prepared by the preparation method of the high-temperature resistant heat-insulating coating according to any one of claims 3 to 5; The outer steel substrate of the fire-fighting robot includes: an outer protective steel plate of the fire-fighting robot and exposed transmission components.

7. A firefighting robot according to claim 6, characterized in that: The coating method of the high temperature resistant heat insulation coating is: A1. Surface treatment of the outer protective steel substrate of the fire-fighting robot, including pickling, grinding, washing and drying; A2. Spraying the high temperature resistant heat insulation coating onto the surface of the outer protective steel substrate of the fire fighting robot after surface treatment; A3. After drying, high temperature sintering and cooling are performed to obtain a high temperature resistant heat insulation coating; A4. Return to step A2 to spray, dry and sinter again according to the insulation requirements.

8. The fire-fighting robot according to claim 7, characterized in that: In A2, the spraying temperature is room temperature and the spraying pressure is 5-8 MPa.

9. The fire-fighting robot according to claim 7, characterized in that: In the A3, the drying temperature is 50-80°C.

10. The fire-fighting robot according to claim 7, characterized in that: In A3, during the sintering process, the heating rate is 2-5°C / min, from room temperature to 1000-1200°C; After heating is completed, keep warm for 100-150 minutes and then cool.

11. The fire-fighting robot according to claim 7, characterized in that: During the coating process, after a single coating and sintering, the thickness of the high temperature resistant heat insulation coating is 0.3-1 mm; After multiple spraying, drying and sintering, the maximum thickness of the high temperature resistant heat insulation coating is 15mm.

12. A steel substrate surface protection structure, characterized in that: It includes a high-temperature resistant thermal insulation coating, which is coated on the surface of the steel substrate. The high-temperature resistant thermal insulation coating adopts a high-temperature resistant thermal insulation coating, and the high-temperature resistant thermal insulation coating is prepared by the preparation method of the high-temperature resistant thermal insulation coating described in any one of claims 3 to 5.

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