Low-thermal-conductivity and high-infrared-reflection coating, preparation method thereof, coating and pot rack

Abstract

The invention belongs to the technical field of alloy materials, and particularly relates to a low-thermal-conductivity and high-infrared-reflection coating, a preparation method of the low-thermal-conductivity and high-infrared-reflection coating, a coating and a pot rack. The functional material comprises the following components in parts by weight: 10-15 parts of hollow aluminum oxide ceramic microbeads, 30-45 parts of silicon dioxide or polysilazane, 10-15 parts of nano calcium oxide, 5-15 parts of nano magnesium oxide, 5-8 parts of molybdenum dioxide, 5-10 parts of titanium dioxide, 5-8 parts of silicon carbide and 0.5-1 part of boron carbide. According to the low-heat-conductivity and high-infrared-reflection coating provided by the invention, a coating is formed on the surface of a pot rack, and the infrared heat reflection performance of the inner surface of the pot rack can be improved, so that the gas energy utilization rate is increased; compared with an existing heat reflection coating, the energy utilization rate can be increased by at least five percent points.

Description

Technical Field

[0001] The invention belongs to the technical field of heat reflection, and relates to a low-thermal-conductivity high-infrared-reflective coating, a preparation method thereof, a coating and a pot rack. Background Art

[0002] Existing gas stoves have serious energy overflow during use, which not only wastes energy, but also increases the temperature of the surrounding environment, deteriorating the cooking environment in the kitchen. In order to achieve energy saving and improve thermal efficiency, most stove manufacturers have added heat collection structures to the pot frame structure design. They set a solid arc-shaped reflective surface on the inner side of the pot frame, so that the heat generated by the stove burning is reflected to the bottom of the pot through this arc-shaped reflective surface, reducing heat dissipation and improving thermal efficiency.

[0003] However, the pot racks in the prior art are all made of steel plates or cast iron materials with enamel or ceramic coatings. The thermal conductivity of the materials is high, and a large amount of heat energy is dissipated from the stove rack and its surroundings during use, reducing the effective utilization of gas heat.

[0004] There are also studies on coatings in the existing technology, which improve energy efficiency by optimizing and improving the coating composition, but the effect is limited and needs further improvement. Summary of the invention

[0005] In order to solve the above problems existing in stainless steel, the present invention provides a low thermal conductivity and high infrared reflective coating, a preparation method thereof and a pot rack, which optimizes the formula of the coating, can effectively reduce energy overflow and improve energy efficiency.

[0006] A first aspect of the present invention provides a low thermal conductivity and high infrared reflective coating, comprising a functional material and a mixed solvent, wherein the functional material comprises the following components:

[0007] 10-15 parts of hollow alumina ceramic microbeads (calculated by weight at 100% purity), 30-45 parts of silicon dioxide (SiO2) or polysilazane, 10-15 parts of nano calcium oxide (CaO), 5-15 parts of nano magnesium oxide (MgO), 5-8 parts of molybdenum dioxide, 5-10 parts of titanium dioxide, 5-8 parts of silicon carbide, and 0.5-1 part of boron carbide.

[0008] Preferably, the hollow alumina ceramic microbeads include 10 to 15 parts (calculated by weight at 100% purity), 40 to 42 parts of silicon dioxide (SiO2) or polysilazane, 10 to 12 parts of nano calcium oxide (CaO), 5 to 10 parts of nano magnesium oxide (MgO), 5 to 8 parts of molybdenum dioxide, 5 to 6 parts of titanium dioxide, 5 to 8 parts of silicon carbide, and 0.5 to 1 part of boron carbide.

[0009] Preferably, the hollow alumina ceramic microbeads include 13.5 parts, silicon dioxide or polysilazane 41 parts, 10-12 parts of nano calcium oxide, 8.5 parts of nano magnesium oxide, 6 parts of molybdenum dioxide, 6 parts of titanium dioxide, 6 parts of silicon carbide, and 0.5 parts of boron carbide.

[0010] Preferably, the particle size of the hollow alumina ceramic microbeads is not less than 2000 mesh.

[0011] Preferably, the particle size of the silicon dioxide or polysilazane, nano calcium oxide, nano magnesium oxide, molybdenum dioxide, titanium dioxide, silicon carbide, and boron carbide is less than 500 nm.

[0012] Preferably, the mixed solvent comprises the following components: 45-60 parts of modified silicate solution, 10-15 parts of aluminum phosphate solution, 10-25 parts of deionized water, 20-35 parts of isopropanol, 2-5 parts of polyurethane diol, 0.5-1 part of surfactant, and 1-3 parts of defoaming agent.

[0013] Preferably, the coating comprises the following components: 13.5 parts of hollow alumina ceramic microbeads, 41 parts of silicon dioxide or polysilazane, 10 parts of nano calcium oxide, 8.5 parts of nano magnesium oxide, 6 parts of molybdenum dioxide, 6 parts of titanium dioxide, 6 parts of silicon carbide, 0.5 parts of boron carbide, 52 parts of modified silicate solution, 15 parts of aluminum phosphate solution, 25 parts of deionized water, 22 parts of isopropanol, 2 parts of polyurethane diol, 1 part of surfactant, and 3 parts of defoaming agent.

[0014] Preferably, the modified silicate solution is a solution modified with hydroxy silicate, and the modification method is to react chloromethylated polystyrene with trimethylamine to prepare the corresponding polystyrene quaternary ammonium salt, and then modify the hydroxy silicate.

[0015] The second aspect of the present invention provides a method for preparing the above-mentioned low thermal conductivity and high infrared reflective coating, comprising the following steps:

[0016] S1. The functional material is installed in a mixed ratio and added to the mixer at a speed of 180 to 250 rpm. Stirring is continued during the addition process. After the addition is completed, stirring is continued for not less than 15 minutes to obtain a functional material mixture;

[0017] S2. Filter the functional material mixture using a 300-500 mesh screen to remove lumps; and obtain a stable mixed liquid, i.e., a low thermal conductivity and high infrared reflective coating.

[0018] The third aspect of the present invention provides a coating formed by the above-mentioned low thermal conductivity and high infrared reflective coating.

[0019] A fourth aspect of the present invention provides a pot rack, which uses the low thermal conductivity and high infrared reflective coating as described above to form a low thermal conductivity and high infrared reflective coating on the surface.

[0020] By implementing the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0021] The low thermal conductivity and high infrared reflective coating provided by the present invention forms a coating on the surface of the pot rack, which can improve the infrared heat reflective performance of the inner surface of the pot rack, thereby improving the gas energy utilization rate; compared with the existing heat reflective coating, the energy utilization rate can be improved by at least five percentage points. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] raw material:

[0024] Hollow alumina ceramic microspheres: commercially available;

[0025] No. 1 - hollow alumina ceramic microbeads with a particle size of about 3000 mesh, No. 2 - hollow alumina ceramic microbeads with a particle size of about 4000 mesh, No. 3 - hollow alumina ceramic microbeads with a particle size of about 1500 mesh.

[0026] Silica: Commercially available, D50 particle size is 450 nm.

[0027] Nano calcium oxide: commercially available, D50 particle size is 310nm.

[0028] Nano magnesium oxide: commercially available, D50 particle size is 310nm.

[0029] Molybdenum dioxide: commercially available, D50 particle size is 420nm.

[0030] Titanium dioxide: commercially available, D50 particle size is 450nm.

[0031] Silicon carbide: commercially available, D50 particle size is 400nm.

[0032] Boron carbide: commercially available, D50 particle size is 420nm.

[0033] The modified silicate solution is a solution modified by hydroxy silicate, and the modification method is to prepare the corresponding polystyrene quaternary ammonium salt by reacting chloromethylated polystyrene with trimethylamine, and then modify the hydroxy silicate.

[0034] Example 1

[0035] The present embodiment provides a low thermal conductivity and high infrared reflective coating, which includes the following components, in parts by weight: 10 parts of No. 1 hollow alumina ceramic microbeads (calculated based on 100% purity by weight), 30 parts of silicon dioxide (SiO2), 10 parts of nano calcium oxide (CaO), 10 parts of nano magnesium oxide (MgO), 5 parts of molybdenum dioxide, 5 parts of titanium dioxide, 5 parts of silicon carbide, 1 part of boron carbide, 50 parts of modified silicate solution, 10 parts of aluminum phosphate solution, 25 parts of deionized water, 20 parts of isopropyl alcohol, 2 parts of polyurethane diol, 1 part of polyether modified silicone oil, and 1 part of polydimethylsiloxane.

[0036] First, hollow alumina ceramic microbeads, silicon dioxide, nano calcium oxide, nano magnesium oxide, molybdenum dioxide, titanium dioxide, silicon carbide, and boron carbide are added to the mixer by weight, the speed is adjusted to 200 rpm and stirring is started, and then modified silicate solution, aluminum phosphate solution, deionized water, isopropyl alcohol, polyurethane diol, surfactant and defoamer are added in sequence, stirring is continued during the addition process, and the stirring time is continued for not less than 15 minutes after the addition is completed, so that the components are mixed evenly as much as possible. Then the mixture is filtered with a 300-mesh screen to remove the lumps; a stable mixed liquid is obtained.

[0037] Example 2

[0038] The present embodiment provides a low thermal conductivity and high infrared reflective coating, which includes the following components, in parts by weight: 12 parts of No. 2 hollow alumina ceramic microbeads (calculated based on 100% purity weight), 35 parts of silicon dioxide, 15 parts of nano calcium oxide, 10 parts of nano magnesium oxide, 6 parts of molybdenum dioxide, 8 parts of titanium dioxide, 8 parts of silicon carbide, 0.5 parts of boron carbide, 60 parts of modified silicate solution, 15 parts of aluminum phosphate solution, 10 parts of deionized water, 25 parts of isopropyl alcohol, 5 parts of polyurethane diol, 0.5 parts of surfactant polyether modified silicone oil, and 1 part of polydimethylsiloxane.

[0039] First, hollow alumina ceramic microbeads, silicon dioxide, nano calcium oxide, nano magnesium oxide, molybdenum dioxide, titanium dioxide, silicon carbide, and boron carbide are added to the mixer by weight, the speed is adjusted to 200 rpm and stirring is started, and then modified silicate solution, aluminum phosphate solution, deionized water, isopropyl alcohol, polyurethane diol, surfactant and defoamer are added in sequence, stirring is continued during the addition process, and the stirring time is continued for not less than 15 minutes after the addition is completed, so that the components are mixed evenly as much as possible. Then the mixture is filtered with a 300-mesh screen to remove the lumps; a stable mixed liquid is obtained.

[0040] Example 3

[0041] The present embodiment provides a low thermal conductivity and high infrared reflective coating, which includes the following components, in parts by weight: 15 parts of No. 1 hollow alumina ceramic microbeads (calculated based on 100% purity by weight), 30 parts of silicon dioxide, 15 parts of nano calcium oxide, 8 parts of nano magnesium oxide, 6 parts of molybdenum dioxide, 6 parts of titanium dioxide, 8 parts of silicon carbide, 0.5 parts of boron carbide, 55 parts of modified silicate solution, 15 parts of aluminum phosphate solution, 20 parts of deionized water, 20 parts of isopropyl alcohol, 2 parts of polyurethane diol, 0.5 parts of polyether modified silicone oil, and 3 parts of polydimethylsiloxane.

[0042] First, hollow alumina ceramic microbeads, silicon dioxide, nano calcium oxide, nano magnesium oxide, molybdenum dioxide, titanium dioxide, silicon carbide, and boron carbide are added to the mixer by weight, the speed is adjusted to 200 rpm and stirring is started, and then modified silicate solution, aluminum phosphate solution, deionized water, isopropyl alcohol, polyurethane diol, surfactant and defoamer are added in sequence, stirring is continued during the addition process, and the stirring time is continued for not less than 15 minutes after the addition is completed, so that the components are mixed evenly as much as possible. Then the mixture is filtered with a 300-mesh screen to remove the lumps; a stable mixed liquid is obtained.

[0043] Example 4

[0044] This embodiment provides a low thermal conductivity and high infrared reflective coating, the only difference from Embodiment 1 is that silicon dioxide is replaced by polysilazane.

[0045] Example 5

[0046] The present embodiment provides a low thermal conductivity and high infrared reflective coating, which includes the following components, in parts by weight: 15 parts of No. 1 hollow alumina ceramic microbeads (calculated based on 100% purity by weight), 40 parts of silicon dioxide, 12 parts of nano calcium oxide, 8 parts of nano magnesium oxide, 6 parts of molybdenum dioxide, 6 parts of titanium dioxide, 8 parts of silicon carbide, 0.5 parts of boron carbide, 55 parts of modified silicate solution, 15 parts of aluminum phosphate solution, 20 parts of deionized water, 20 parts of isopropyl alcohol, 2 parts of polyurethane diol, 0.5 parts of polyether modified silicone oil, and 3 parts of polydimethylsiloxane.

[0047] First, hollow alumina ceramic microbeads, silicon dioxide, nano calcium oxide, nano magnesium oxide, molybdenum dioxide, titanium dioxide, silicon carbide, and boron carbide are added to the mixer by weight, the speed is adjusted to 200 rpm and stirring is started, and then modified silicate solution, aluminum phosphate solution, deionized water, isopropyl alcohol, polyurethane diol, surfactant and defoamer are added in sequence, stirring is continued during the addition process, and the stirring time is continued for not less than 15 minutes after the addition is completed, so that the components are mixed evenly as much as possible. Then the mixture is filtered with a 300-mesh screen to remove the lumps; a stable mixed liquid is obtained.

[0048] Example 6

[0049] This embodiment provides a low thermal conductivity and high infrared reflective coating, which includes the following components in parts by weight:

[0050] 13.5 parts of No. 1 hollow alumina ceramic microbeads (calculated based on 100% purity by weight), 41 parts of silicon dioxide, 10 parts of nano calcium oxide, 8.5 parts of nano magnesium oxide, 6 parts of molybdenum dioxide, 6 parts of titanium dioxide, 6 parts of silicon carbide, 0.5 parts of boron carbide, 52 parts of modified silicate solution, 15 parts of aluminum phosphate solution, 25 parts of deionized water, 22 parts of isopropyl alcohol, 2 parts of polyurethane diol, 1 part of polyether modified silicone oil, and 3 parts of polydimethylsiloxane.

[0051] First, hollow alumina ceramic microbeads, silicon dioxide, nano calcium oxide, nano magnesium oxide, molybdenum dioxide, titanium dioxide, silicon carbide, and boron carbide are added to the mixer by weight, the speed is adjusted to 200 rpm and stirring is started, and then modified silicate solution, aluminum phosphate solution, deionized water, isopropyl alcohol, polyurethane diol, surfactant and defoamer are added in sequence, stirring is continued during the addition process, and the stirring time is continued for not less than 15 minutes after the addition is completed, so that the components are mixed evenly as much as possible. Then the mixture is filtered with a 300-mesh screen to remove the lumps; a stable mixed liquid is obtained.

[0052] Example 7

[0053] This embodiment provides a low thermal conductivity and high infrared reflective coating, the only difference from Embodiment 5 is that the amount of silicon dioxide added is 30 parts.

[0054] Example 8

[0055] This embodiment provides a low thermal conductivity and high infrared reflective coating, the only difference from Embodiment 5 is that the added amount of silicon dioxide is 35 parts.

[0056] Comparative Example 1

[0057] This comparative example provides a low thermal conductivity and high infrared reflective coating, which is different from Example 1 only in that 15 parts of No. 1 hollow alumina ceramic microspheres are not added.

[0058] Comparative Example 2

[0059] This comparative example provides a low thermal conductivity and high infrared reflective coating, the only difference from Example 1 is that the No. 1 hollow alumina ceramic microbeads are replaced by No. 3 hollow alumina ceramic microbeads.

[0060] Comparative Example 3

[0061] This comparative example provides a low thermal conductivity and high infrared reflective coating, the only difference from Example 1 is that the addition amount of No. 1 hollow alumina ceramic microbeads is 8 parts.

[0062] Comparative Example 4

[0063] This comparative example provides a low thermal conductivity and high infrared reflective coating, the only difference from Example 1 is that the addition amount of No. 1 hollow alumina ceramic microbeads is 6 parts.

[0064] Comparative Example 5

[0065] This comparative example provides a low thermal conductivity and high infrared reflective coating, the only difference from Example 1 is that the addition amount of No. 1 hollow alumina ceramic microbeads is 18 parts.

[0066] Comparative Example 6

[0067] This comparative example provides a low thermal conductivity and high infrared reflective coating, the only difference from Example 1 is that the addition amount of No. 1 hollow alumina ceramic microbeads is 20 parts.

[0068] Application Examples

[0069] The coatings in the above-mentioned embodiments and comparative examples are applied to a pot rack to form a corresponding coating on one side of the pot rack in the following manner:

[0070] S1. Use 120 mesh corundum to sandblast the surface of the pot rack blade assembly and the rack seat assembly at a pressure of 0.3Mpa to increase the surface roughness to more than 6.3um, remove the surface oxide and improve the adhesion of the coating.

[0071] S2. Spray the coating on the sandblasted surface of the pot rack blade assembly and the frame seat assembly with a thickness of 100um, then dry it at 85℃ for 15min to dry the surface, and then heat it to 800℃ and high temperature cure for 10min to obtain a dense low thermal conductivity and high infrared reflective coating.

[0072] In order to explore the effect of coating on energy efficiency, the initial energy efficiency and working energy efficiency of the pot rack coated with the corresponding coating were tested respectively. The test results are shown in Table 1. The energy efficiency test method is: GB16410-2020. Among them, the initial energy efficiency refers to the energy efficiency of the product when it leaves the factory, that is, the energy efficiency of the new product. Working energy efficiency refers to the energy efficiency after a period of simulation. The simulation conditions are: the corresponding pot rack is subjected to gas combustion treatment three times at the same time in the morning, noon and evening every day, each time for one hour, and the treatment lasts for one month to test the energy efficiency. At the same time, the energy efficiency loss is calculated, energy efficiency loss = initial energy efficiency - working energy efficiency.

[0073] Table 1 Energy efficiency test results of pot racks

[0074]

Claims

1. A low thermal conductivity and high infrared reflective coating, comprising a functional material and a mixed solvent, characterized in that: The functional material comprises the following components: 10-15 parts of hollow alumina ceramic microbeads, 30-45 parts of silicon dioxide or polysilazane, 10-15 parts of nano calcium oxide, 5-15 parts of nano magnesium oxide, 5-8 parts of molybdenum dioxide, 5-10 parts of titanium dioxide, 5-8 parts of silicon carbide, and 0.5-1 part of boron carbide.

2. The low thermal conductivity and high infrared reflective coating according to claim 1, characterized in that: The hollow alumina ceramic microbeads include 10 to 15 parts, silicon dioxide or polysilazane 40 to 42 parts, nano calcium oxide 10 to 12 parts, nano magnesium oxide 5 to 10 parts, molybdenum dioxide 5 to 6 parts, titanium dioxide 5 to 8 parts, silicon carbide and boron carbide 0.5 to 1 part.

3. The low thermal conductivity and high infrared reflective coating according to claim 2, characterized in that: The hollow alumina ceramic microbeads include 13.5 parts, silicon dioxide or polysilazane 41 parts, 10-12 parts of nano calcium oxide, 8.5 parts of nano magnesium oxide, 6 parts of molybdenum dioxide, 6 parts of titanium dioxide, 6 parts of silicon carbide and 0.5 parts of boron carbide.

4. The low thermal conductivity and high infrared reflective coating according to claim 1, characterized in that: The particle size of the hollow alumina ceramic microbeads is not less than 2000 meshes.

5. The low thermal conductivity and high infrared reflective coating according to claim 2, characterized in that: The particle sizes of the silicon dioxide or polysilazane, nano calcium oxide, nano magnesium oxide, molybdenum dioxide, titanium dioxide, silicon carbide and boron carbide are all less than 500 nm.

6. The low thermal conductivity and high infrared reflective coating according to claim 4, characterized in that: The mixed solvent comprises the following components: 45-60 parts of modified silicate solution, 10-15 parts of aluminum phosphate solution, 10-25 parts of deionized water, 20-35 parts of isopropanol, 2-5 parts of polyurethane diol, 0.5-1 part of surfactant and 1-3 parts of defoaming agent.

7. The low thermal conductivity and high infrared reflective coating according to claim 6, characterized in that: The invention comprises the following components: 13.5 parts of hollow alumina ceramic microbeads, 41 parts of silicon dioxide or polysilazane, 10 parts of nano calcium oxide, 8.5 parts of nano magnesium oxide, 6 parts of molybdenum dioxide, 6 parts of titanium dioxide, 6 parts of silicon carbide, 0.5 parts of boron carbide, 52 parts of modified silicate solution, 15 parts of aluminum phosphate solution, 25 parts of deionized water, 22 parts of isopropanol, 2 parts of polyurethane diol, 1 part of surfactant and 3 parts of defoaming agent.

8. A method for preparing a low thermal conductivity and high infrared reflective coating as described in claims 1-7, characterized in that: The steps include: S1. The functional material is installed in a mixed ratio and added to the mixer at a speed of 180 to 250 rpm. Stir continuously during the addition process. After the addition is completed, stirring is continued for not less than 15 minutes to obtain a functional material mixture; S2. Filter the functional material mixture using a 300-500 mesh sieve to remove lumps; A stable mixed liquid is obtained, namely a coating with low thermal conductivity and high infrared reflection.

9. A coating, characterized in that: It is formed by using the low thermal conductivity and high infrared reflection coating as described in claims 1 to 7.

10. A pot stand, characterized in that: Having a coating as claimed in claim 9.

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