High-temperature resistant heat-insulating coating and spraying method for surface coating of firefighting robots

Abstract

The application discloses a high-temperature-resistant heat-insulating coating for surface coating of a fire-fighting robot and a spraying method, and comprises a radiative base material and a reflective surface material.The radiative base material comprises a slurry prepared by mixing 90-120 parts of glass phase pre-ground powder, 60-80 parts of radiative filler hollow glass microbeads and 90-120 parts of water according to weight fractions; the reflective surface material comprises a slurry prepared by mixing 90-140 parts of glass phase pre-ground powder, 30-45 parts of reflective filler titanium white and 90-120 parts of water according to weight fractions; wherein the glass phase pre-ground powder comprises the following components and weight fractions: SiO2 60-80 parts, Al2O3 7-10 parts, K2O 4-8 parts, CaO 4-8 parts and B2O3 4-7 parts; the application has a reasonable structure, good heat-insulating effect and good anti-cracking and peeling effect.

Description

Technical Field

[0001] This invention relates to the field of firefighting robots, and more specifically, to a high-temperature resistant heat-insulating coating and a spraying method for surface coating of firefighting robots. Background Technology

[0002] With the development of urbanization, the hazards of fires are increasing, greatly increasing the difficulty of fire rescue and threatening the lives of firefighters. Firefighting robots can enter the fire scene, investigate the situation, clear paths, and carry out firefighting, making them a powerful tool for fire rescue. However, the internal conditions of a fire are complex, the fire is fierce, and the temperature is high, reaching over 1000℃ in special circumstances such as the presence of flammable gases. This can significantly affect, or even damage, the delicate electronic components inside the firefighting robot, rendering it unusable. Therefore, high requirements are placed on the heat insulation protection of the electronic components inside the firefighting robot.

[0003] In the existing technology, most of the heat insulation materials used in fire-fighting robots and other fire-fighting equipment on the market are heat insulation cotton or organic heat insulation coatings. Organic heat insulation coatings have poor high temperature resistance and weak adhesion to the substrate, which leads to coating peeling. Under high temperature, the heat insulation effect is poor, and heat is easily conducted to the interior, affecting the use and operation of the electronic components of the equipment, and even causing shutdown.

[0004] Inorganic coatings have high high-temperature resistance, but ordinary inorganic coatings have poor toughness, insufficient adhesion strength to metal substrates, and poor resistance to alternating hot and cold temperatures, which can easily lead to cracking and peeling. There is an urgent need for high-temperature resistant and heat-insulating coatings for the surface coating of fire-fighting robots to solve the above problems. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a high-temperature resistant heat-insulating coating and spraying method for surface coating of fire-fighting robots, so as to solve the problems mentioned in the background art. The invention has a reasonable structure, good heat insulation effect, and good anti-cracking and anti-peeling effect.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] High-temperature heat-insulating coating for surface coating of fire-fighting robots includes a radiation base and a reflective material. The radiation base includes a slurry prepared by mixing 90-120 parts by weight of glass phase pre-ground powder, 60-80 parts by weight of radiation filler, and 90-120 parts by weight of water.

[0008] The reflective fabric comprises a slurry prepared by mixing 90-140 parts by weight of glass phase pre-ground powder, 30-45 parts by weight of reflective filler, and 90-120 parts by weight of water.

[0009] The glass phase pre-grinding powder includes the following components and their weight proportions:

[0010] SiO2 60-80 parts,

[0011] Al2O3 7-10 parts,

[0012] K2O 4-8 parts,

[0013] 4-8 parts CaO

[0014] B2O3 4-7 parts;

[0015] The radioactive filler comprises 60-80 parts by weight of hollow glass microspheres;

[0016] The reflective filler comprises 30-45 parts by weight of titanium dioxide.

[0017] Preferably, the glass phase pre-ground powder in the radioactive substrate is mixed with water in a 1:1 weight ratio.

[0018] Preferably, the glass phase pre-ground powder in the reflective fabric is mixed with water in a weight ratio of 1.3:1.

[0019] Preferably, the hollow glass microspheres have a particle size of 120-180 μm.

[0020] The method for spraying high-temperature resistant and heat-insulating coatings for the surface coating of firefighting robots includes the following steps:

[0021] Step (A) Weigh 90-120 parts of glass phase pre-ground powder by weight, ball mill it in a planetary ball mill at 300-500 r / min for 5-20 min, sieve it through a 100-200 mesh, and then mix it with 90-120 parts of water and 60-80 parts of hollow glass microspheres evenly to obtain a radioactive base material.

[0022] Step (B) Apply the radioactive base material obtained in step (A) to the surface of the base steel plate using a soft brush. After surface drying, dry at 50-70℃ for 0.5-2 hours and apply again with a thickness of 0.5-1 mm. After surface drying, place it in an oven at 50-70℃ for 10-15 hours. Sinter the coated base steel plate at 700-950℃ and hold for 2-10 minutes before removing it to form a radioactive coating on its surface.

[0023] Step (C) Weigh 90-140 parts by weight of glass phase pre-ground powder, 90-120 parts by weight of water, and 30-45 parts by weight of titanium dioxide and mix them. Then, ball mill them in a planetary ball mill at 300-500 r / min for 5-20 min and sieve them through a 100-200 mesh screen to obtain the reflective fabric.

[0024] Step (D) The reflective fabric obtained in step (C) is sprayed onto the surface of the radiation layer coating formed in step (B) using a spray gun. The thickness is 0.3-0.5 mm. After surface drying, it is placed in an oven at 50-70℃ for 10-15 hours. The coated substrate steel plate is then sintered at 820℃ and kept at that temperature for 2-10 minutes before being removed to form a reflective layer coating on its surface.

[0025] Preferably, the glass phase pre-ground powder in step (A) and the reflective fabric in step (C) are both ball-milled to 150 mesh and sieved using a planetary ball mill.

[0026] The beneficial effects of this invention are as follows: The high-temperature resistant heat-insulating coating and spraying method for surface coating of fire-fighting robots of this invention are designed with a two-layer structure of a radioactive base material (bottom layer) and a reflective surface material (top layer) formed by spraying the coating prepared by this invention. The top layer is a reflective layer composed of glass phase components and reflective fillers. Titanium dioxide is added as the main reflective filler. The main component of titanium dioxide is TiO2, which has the advantages of high refractive index, strong coloring ability, and strong reflection and scattering of ultraviolet rays. It can also enhance the mechanical strength and adhesion of the coating, prevent cracks and fissures, thus having strong adhesion, tight bonding with the substrate, good resistance to alternating hot and cold temperatures, and is not easy to crack and peel off.

[0027] The bottom layer is a radiation layer, composed of a glass phase and a radiation filler. The radiation filler is mainly hollow glass microspheres, with borosilicate as the main component and a particle size of 150μm. It has the characteristics of high compressive strength, high melting point, low thermal conductivity and low thermal shrinkage. The interior is a thin layer of gas, which has excellent thermal insulation performance. At the same time, it has stable high-temperature chemical properties, high chemical inertness, and is not easily affected by corrosive substances such as acids and alkalis. It can effectively prevent breakage and detachment caused by impact and thermal shock during use at high temperatures. It does not contain and will not produce harmful substances or other by-products.

[0028] The coating formed by the coating prepared by this invention can withstand high temperatures of 800℃, has good heat preservation effect at high temperatures, and can effectively prevent heat transfer. Attached Figure Description

[0029] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the heat conduction structure of a high-temperature resistant heat-insulating coating for surface coating of a fire-fighting robot according to an embodiment of this application after being sprayed onto a base steel plate. Detailed Implementation

[0031] The present invention will be further described below. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0032] The high-temperature resistant heat-insulating coating for surface coating of fire-fighting robots of the present invention includes a radioactive base material and a reflective material. The radioactive base material includes a slurry prepared by mixing 90-120 parts by weight of glass phase pre-ground powder, 60-80 parts by weight of radioactive filler, and 90-120 parts by weight of water.

[0033] The reflective fabric comprises a slurry prepared by mixing 90-140 parts by weight of glass phase pre-ground powder, 30-45 parts by weight of reflective filler, and 90-120 parts by weight of water.

[0034] The glass phase pre-grinding powder includes the following components and their weight proportions:

[0035] SiO2 60-80 parts,

[0036] Al2O3 7-10 parts,

[0037] K2O4-8 parts,

[0038] CaO 4-8 parts,

[0039] B2O34-7 parts;

[0040] The radioactive filler comprises 60-80 parts by weight of hollow glass microspheres;

[0041] The reflective filler comprises 30-45 parts by weight of titanium dioxide.

[0042] Preferably, the glass phase pre-ground powder in the radioactive substrate is mixed with water in a 1:1 weight ratio.

[0043] Preferably, the glass phase pre-ground powder in the reflective fabric is mixed with water in a weight ratio of 1.3:1.

[0044] Preferably, the hollow glass microspheres have a particle size of 120-180 μm.

[0045] The method for spraying high-temperature resistant and heat-insulating coatings for the surface coating of firefighting robots includes the following steps:

[0046] Step (A) Weigh 90-120 parts of glass phase pre-ground powder by weight, ball mill it in a planetary ball mill at 300-500 r / min for 5-20 min, sieve it through a 100-200 mesh, and then mix it with 90-120 parts of water and 60-80 parts of hollow glass microspheres evenly to obtain a radioactive base material.

[0047] Step (B) Apply the radioactive base material obtained in step (A) to the surface of the base steel plate using a soft brush. After surface drying, dry at 50-70℃ for 0.5-2 hours and apply again with a thickness of 0.5-1 mm. After surface drying, place it in an oven at 50-70℃ for 10-15 hours. Sinter the coated base steel plate at 700-950℃ and hold for 2-10 minutes before removing it to form a radioactive coating on its surface.

[0048] Step (C) Weigh 90-140 parts by weight of glass phase pre-ground powder, 90-120 parts by weight of water, and 30-45 parts by weight of titanium dioxide and mix them. Then, ball mill them in a planetary ball mill at 300-500 r / min for 5-20 min and sieve them through a 100-200 mesh screen to obtain the reflective fabric.

[0049] Step (D) The reflective fabric obtained in step (C) is sprayed onto the surface of the radiation layer coating formed in step (B) using a spray gun. The thickness is 0.3-0.5 mm. After surface drying, it is placed in an oven at 50-70℃ for 10-15 hours. The coated substrate steel plate is then sintered at 820℃ and kept at that temperature for 2-10 minutes before being removed to form a reflective layer coating on its surface.

[0050] Preferably, the glass phase pre-ground powder in step (A) and the reflective fabric in step (C) are both ball-milled to 150 mesh and sieved using a planetary ball mill.

[0051] The following describes specific embodiments of the high-temperature resistant heat-insulating coating and spraying method for surface coating of fire-fighting robots according to the present invention.

[0052] Example 1,

[0053] Step (A1): Weigh 100 parts of glass phase pre-ground powder by weight and ball mill it in a planetary ball mill at 400 r / min for 10 min. Then, sieve it through a 150 mesh and mix it evenly with 100 parts of water and 70 parts of hollow glass microspheres. The hollow glass microspheres have a particle size of 150 μm to obtain a radioactive base material. The glass phase pre-ground powder includes the following components and the weight parts of each component are: 60 parts of SiO2, 7 parts of Al2O3, 4 parts of K2O, 4 parts of CaO, and 4 parts of B2O3.

[0054] Step (B1) The radioactive base material obtained in step (A1) is applied to the surface of the base steel plate using a soft brush. After surface drying, it is dried at 60°C for 1 hour and then applied again with a thickness of 0.5 mm. After surface drying, it is placed in an oven at 60°C for 12 hours. The coated base steel plate is sintered at 860°C and held for 5 minutes before being taken out to form a radioactive coating on its surface.

[0055] Step (C1) Weigh 130 parts by weight of glass phase pre-ground powder, 100 parts by weight of water and 30 parts by weight of titanium dioxide and mix them. Ball mill them in a planetary ball mill at 400 r / min for 10 min and sieve them through a 150 mesh to obtain a reflective fabric. The glass phase pre-ground powder includes the following components and the weight parts of each component are: 60 parts SiO2, 7 parts Al2O3, 4 parts K2O, 4 parts CaO, and 4 parts B2O3.

[0056] In step (D1), the reflective fabric obtained in step (C1) is sprayed onto the surface of the radiation layer coating formed in step (B1) using a spray gun. The thickness is 0.5 mm. After surface drying, it is placed in an oven at 60°C for 12 hours. The coated base steel plate is sintered at 820°C and kept at that temperature for 5 minutes before being removed to form a reflective layer coating on its surface.

[0057] Example 2,

[0058] Step (A2): Weigh 100 parts of glass phase pre-ground powder by weight and ball mill it in a planetary ball mill at 400 r / min for 10 min. Sieve it through a 150 mesh sieve and then mix it with 100 parts of water and 80 parts of hollow glass microspheres. The hollow glass microspheres have a particle size of 150 μm to obtain a radioactive base material. The glass phase pre-ground powder includes the following components and the weight parts of each component are: 60 parts of SiO2, 7 parts of Al2O3, 4 parts of K2O, 4 parts of CaO, and 4 parts of B2O3.

[0059] Step (B2) The radioactive base material obtained in step (A2) is applied to the surface of the base steel plate using a soft brush. After surface drying, it is dried at 60°C for 1 hour and then applied again with a thickness of 0.5 mm. After surface drying, it is placed in an oven at 60°C for 12 hours. The coated base steel plate is sintered at 860°C and held for 5 minutes before being taken out to form a radioactive coating on its surface.

[0060] Step (C2): Weigh 130 parts by weight of glass phase pre-ground powder, 100 parts by weight of water, and 40 parts by weight of titanium dioxide and mix them. Then, ball mill the mixture in a planetary ball mill at 400 r / min for 10 min and sieve it through a 150 mesh to obtain a reflective fabric. The glass phase pre-ground powder includes the following components and the weight parts of each component are as follows: 60 parts SiO2, 7 parts Al2O3, 4 parts K2O, 4 parts CaO, and 4 parts B2O3.

[0061] In step (D2), the reflective fabric obtained in step (C2) is sprayed onto the surface of the radiation layer coating formed in step (B2) using a spray gun. The thickness is 0.5 mm. After surface drying, it is placed in an oven at 60°C for 12 hours. The coated base steel plate is then sintered at 820°C and kept at that temperature for 5 minutes before being removed to form a reflective layer coating on its surface.

[0062] According to the high-temperature resistant heat-insulating coating and spraying method for surface coating of fire-fighting robots of this application, in Example 1, the coating prepared by this application was obtained by spraying a Q460 steel plate after sandblasting. The coating was tested for high temperature resistance at 500℃, 600℃, 700℃ and 800℃, respectively, and the coating's resistance to thermal cycling was tested. That is, after holding at 500℃, 600℃, 700℃ and 800℃ for 30 minutes, it was directly taken out and air-cooled or water-quenched, and the macroscopic morphology of the coating was observed, as shown in Table 1 below:

[0063]

[0064] Table 1

[0065]

[0066]

[0067] Table 2

[0068] According to Table 1, the heat resistance test results of the high-temperature heat-insulating coating for surface coating of fire-fighting robots prepared in this application are as follows: the coating showed no changes at 500℃, 600℃ and 700℃; at 800℃, the coating edge showed slight shrinkage, but no other obvious changes.

[0069] According to the high-temperature resistant heat-insulating coating and spraying method for surface coating of fire-fighting robots of this application, in Example 2, the coating prepared by this application is obtained by using a sandblasted Q460 steel plate as the substrate. The heat insulation performance of the coating is tested according to the test method of HG / T 4341-2012 "Heat-reflective heat-insulating coatings for metal surfaces". The surfaces of the sample and blank steel plates are uniformly heated to the test temperature, and the back temperatures of the sample and blank steel plates are measured and the temperature difference is calculated. According to Table 2, the results are as follows: at 500℃, the heat insulation temperature can reach 189℃; at 600℃, the heat insulation temperature can reach 193℃; at 700℃, the heat insulation temperature can reach 177℃; and at 800℃, the heat insulation temperature can reach 174℃.

[0070] In summary, the high-temperature resistant heat-insulating coating and spraying method for surface coating of fire-fighting robots provided by this invention are designed with a two-layer structure: a radioactive base layer (bottom layer) and a reflective top layer (top layer) formed by spraying the coating prepared by this invention. The top layer is a reflective layer composed of glass phase components and reflective fillers, with titanium dioxide added as the main reflective filler. Titanium dioxide, whose main component is TiO2, has advantages such as high refractive index, strong coloring ability, and strong reflection and scattering of ultraviolet rays. It can also enhance the mechanical strength and adhesion of the coating, prevent cracks and fissures, thus having strong adhesion, tight bonding with the substrate, good resistance to alternating hot and cold temperatures, and is not easy to crack or peel off.

[0071] The bottom layer is a radiation layer, composed of a glass phase and a radiation filler. The radiation filler is mainly hollow glass microspheres, with borosilicate as the main component and a particle size of 150μm. It has the characteristics of high compressive strength, high melting point, low thermal conductivity and low thermal shrinkage. The interior is a thin layer of gas, which has excellent thermal insulation performance. At the same time, it has stable high-temperature chemical properties, high chemical inertness, and is not easily affected by corrosive substances such as acids and alkalis. It can effectively prevent breakage and detachment caused by impact and thermal shock during use at high temperatures. It does not contain and will not produce harmful substances or other by-products.

[0072] The coating formed by the coating prepared by this invention can withstand high temperatures of 800℃, has good heat preservation effect at high temperatures, and can effectively prevent heat transfer.

[0073] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant thermal insulation coating for surface painting of fire fighting robots, comprising a radiative base material and a reflective surface material, characterized in that, The radiation primer comprises a slurry of 90-120 parts by weight of glass phase pre-ground powder mixed with 60-80 parts by weight of radiation filler and 90-120 parts by weight of water; The reflective surface material comprises a slurry of 90-140 parts by weight of glass phase pre-ground powder mixed with 30-45 parts by weight of reflective filler titanium white powder and 90-120 parts by weight of water; The glass phase pre-ground powder comprises the following components and the weight parts of each component are as follows: SiO260-80 parts, Al2O37-10 parts, K2O 4-8 parts, CaO 4-8 parts, B2O34-7 parts; The radiation filler comprises 60-80 parts by weight of hollow glass microbeads; The main component of the hollow glass microbeads is borosilicate, the particle size is 150 µm, and the hollow glass microbeads have the characteristics of high compressive strength, high melting point, small thermal conductivity and small thermal shrinkage; The reflective filler comprises 35-45 parts by weight of titanium white powder; The spraying method for the high-temperature-resistant heat-insulating coating for surface coating of a fire-fighting robot comprises the following steps: Step (A) 90-120 parts by weight of glass phase pre-ground powder are ball milled at 300-500 r / min for 5-20 min by a planetary ball mill, sieved to 100-200 mesh, and then mixed with 90-120 parts by weight of water and 60-80 parts by weight of hollow glass microbeads to obtain a radiation primer; Step (B) the radiation primer obtained in step (A) is brushed on the surface of a base steel plate by using a soft brush, and after surface drying, the base steel plate is dried at 50-70 °C for 0.5-2 h, then brushed again, the thickness is 0.5-1 mm, and after surface drying, the base steel plate is put into an oven and dried at 50-70 °C for 10-15 h, the base steel plate is taken out after sintering at 700-950 °C for 2-10 min, and a radiation layer coating is formed on the surface of the base steel plate; Step (C) 90-140 parts by weight of glass phase pre-ground powder, 90-120 parts by weight of water and 30-45 parts by weight of titanium white powder are mixed and ball milled at 300-500 r / min for 5-20 min by a planetary ball mill, and sieved to 100-200 mesh to obtain a reflective surface material; Step (D) the reflective surface material obtained in step (C) is sprayed on the surface of the radiation layer coating formed in step (B) by using a spray gun, the thickness is 0.3-0.5 mm, and after surface drying, the base steel plate is put into an oven and dried at 50-70 °C for 10-15 h, and the base steel plate is taken out after sintering at 820 °C for 2-10 min, so that a reflective layer coating is formed on the surface of the base steel plate.

2. The high-temperature-resistant thermal insulation coating for surface coating of firefighting robots according to claim 1, characterized in that, The glass phase pre-ground powder in the radiation primer is mixed with water at a weight ratio of 1:

1.

3. The high-temperature-resistant thermal insulation coating for surface coating of fire-fighting robots according to claim 1, characterized in that, The glass phase pre-ground powder in the reflective surface material is mixed with water at a weight ratio of 1.3:

1.

4. The spraying method for the high-temperature-resistant thermal-insulation coating for the surface coating of the firefighting robot according to any one of claims 1-3, characterized in that, The spraying method comprises the following steps: Step (A) 90-120 parts by weight of glass phase pre-ground powder are ball milled at 300-500 r / min for 5-20 min by a planetary ball mill, sieved to 100-200 mesh, and then mixed with 90-120 parts by weight of water and 60-80 parts by weight of hollow glass microbeads to obtain a radiation primer; Step (B) the radiation primer prepared in step (A) is applied to the surface of the base steel plate by using a soft brush, and after surface drying, it is baked at 50-70℃ for 0.5-2h, then applied again, with a thickness of 0.5~1mm, and after surface drying, it is baked in an oven at 50-70℃ for 10-15h, the base steel plate after coating is sintered at 700-950℃ and kept for 2-10min, then taken out, so that the surface forms a radiation layer coating; Step (C) 90-140 parts of glass phase pre-ground powder, 90-120 parts of water and 30-45 parts of titanium white powder are weighed and mixed, and then ball milled by a planetary ball mill at 300-500r / min for 5-20min, and sieved to 100-200 meshes to obtain a reflective material; Step (D) the reflective material prepared in step (C) is sprayed on the surface of the radiation layer coating formed in step (B) by using a spray gun, with a thickness of 0.3~0.5mm, and after surface drying, it is baked in an oven at 50-70℃ for 10-15h, the base steel plate after spraying is sintered at 820℃ and kept for 2-10min, then taken out, so that the surface forms a reflective layer coating.

5. The method for spraying the high-temperature-resistant thermal insulation coating for surface coating of a fire-fighting robot according to claim 4, characterized in that, The glass phase pre-ground powder in step (A) and the reflective material in step (C) are both ball milled by a planetary ball mill to 150 mesh.

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