CN110229007B - High-emissivity heat-insulating coating - Google Patents
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- CN110229007B CN110229007B CN201910596986.6A CN201910596986A CN110229007B CN 110229007 B CN110229007 B CN 110229007B CN 201910596986 A CN201910596986 A CN 201910596986A CN 110229007 B CN110229007 B CN 110229007B
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Abstract
The invention belongs to the field ofThe field of temperature energy-saving coatings, in particular to a high-emissivity heat-insulating coating. The disclosed high-emissivity heat-insulating coating is provided with a heat-insulating transition layer and a high-emissivity coating; the high-emissivity coating is positioned outside the heat-preservation transition layer; the heat-insulating transition layer comprises the following raw materials in parts by weight: 30-45 parts of microporous electrofused zirconia hollow spheres, 10-25 parts of filler, 10-25 parts of binding agent and 10-40 parts of solvent, and in addition, 0.1-0.2 part of dispersing agent, 0.3-0.5 part of thickening agent and 0.05-0.15 part of defoaming agent are added; the high-emissivity coating comprises the following raw materials in parts by weight: Me-LaAlO3‑La2Zr2O7‑ZrO230-50 parts of high-emissivity ceramic material, 15-40 parts of bonding agent and 15-50 parts of solvent, and additionally 0.1-0.2 part of dispersing agent, 0.3-0.5 part of thickening agent and 0.05-0.15 part of defoaming agent are added. The ultra-high temperature infrared high-radiation heat-insulation coating has the beneficial effects that: high temperature resistance (the highest service temperature can reach 1800 ℃), low thermal conductivity, high emissivity, firm combination of the coating and the aluminum-silicon refractory material and strong high-temperature stability of the coating.
Description
Technical Field
The invention relates to the technical field of high-temperature energy conservation, in particular to a high-emissivity heat-insulating coating.
Background
In recent years, the rapid increase of energy consumption in China makes the energy-saving situation very severe, the industrial energy consumption for the high-temperature process represented by the thermal furnace kiln accounts for 25-40% of national energy consumption, and meanwhile, the analysis of statistical data shows that the average thermal efficiency of the thermal furnace kiln equipment in China is less than 40% and is 10-20% lower than that of the industrially developed countries; therefore, timely layout and research and development of an energy-saving technology for thermal equipment are necessary and have great significance. In China, the aluminum-silicon series refractory material (Al)2O3/SiO2Such as:alumina fiber brick, mullite fiber module, light clay brick, etc.) is a furnace lining of a thermotechnical furnace kiln with the largest application range and is widely applied to typical high-temperature equipment such as ceramic furnaces. Unfortunately, the emissivity epsilon of the aluminum-silicon refractory material is only 0.5-0.6, and the common countermeasures against the practical problem are as follows: the surface of the aluminum-silicon refractory material is coated with a high-emissivity coating with epsilon more than or equal to 0.9, so that the radiant energy conservation of the furnace is realized.
To date, Wessex, USA, has been the internationally recognized best performing business in the development and application of energy-saving ceramic coatings for infrared radiation, but its product is SiB6The main phase, which causes the price to be high for a long time; in addition, the paint product of Encoat company in Encoat of UK obtains 5% of energy-saving efficiency in the trial use of natural gas furnaces and oil burners, but is not suitable for thermal furnaces and kilns in high-temperature oxidizing atmosphere because SiC powder is used as a radiation base material. The invention discloses an infrared energy-saving coating and application thereof (patent application number: 201510119884.7), which takes lanthanum aluminate with a perovskite structure as a main phase, and the emissivity of the coating in the near infrared can reach above 0.9, but researches show that the coating is formed along with SiO2Increased content of doped LaAlO3Begin to decompose, absorption and emission with SiO2The content is increased and decreased, which limits the application of the aluminum silicon series refractory material.
Therefore, if the coating can be used at high temperature without solid-phase reaction with the refractory material matrix and has high infrared radiation performance, the coating has important significance for improving the energy conservation of the industrial kiln.
Disclosure of Invention
The invention mainly aims to provide a high-emissivity heat-insulating coating aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme:
a high emissivity heat preservation coating, the high emissivity heat preservation coating has heat preservation transition layer and high emissivity coating; the high-emissivity coating is positioned outside the heat-preservation transition layer; the heat-insulating transition layer comprises the following raw materials in parts by weight: 30-45 parts of microporous electrofused zirconia hollow spheres, 10-25 parts of filler, 10-25 parts of binding agent and 10-40 parts of solvent, and in addition, 0.1-0.2 part of dispersing agent, 0.3-0.5 part of thickening agent and 0.05-0.15 part of defoaming agent are added;
the high-emissivity coating comprises the following raw materials in parts by weight: Me-LaAlO3-La2Zr2O7-ZrO230-50 parts of high-emissivity ceramic material, 15-40 parts of bonding agent and 15-50 parts of solvent, and additionally 0.1-0.2 part of dispersing agent, 0.3-0.5 part of thickening agent and 0.05-0.15 part of defoaming agent are added.
The Me-LaAlO3-La2Zr2O7-ZrO2The high-emissivity material comprises the following raw materials in parts by weight: 30-55 parts of lanthanum oxide, 10-25 parts of aluminum oxide, 1-20 parts of zirconium oxide, 1-20 parts of dopant I and 5-20 parts of dopant II; the raw materials are subjected to high-temperature solid phase reaction to prepare Me-LaAlO3-La2Zr2O7-ZrO2A high emissivity material; the doping agent I is one or a mixture of more of magnesium oxide, calcium oxide, barium oxide and strontium oxide, and the doping agent II is one or a mixture of more of chromium oxide, manganese oxide, iron oxide and cobalt oxide.
The granularity of the micropore electric melting zirconia hollow ball is less than or equal to 1 mm.
The filler is one or two of electric melting white corundum micro powder or tabular corundum micro powder, and the granularity of the micro powder is less than or equal to 0.088 mm.
The bonding agent is one of water-based polyurethane resin and water-based acrylic resin.
The solvent is deionized water.
The dispersing agent is one of sodium tripolyphosphate, sodium hexametaphosphate and polyethylene glycol type water reducing agent CAMTMENT FS20 produced by Pasteur Germany.
The thickening agent is carboxymethyl cellulose.
The defoaming agent is a G60 defoaming agent produced by the chemical industry of the sima.
The invention aims to provide a heat-insulating coating which can be used at ultrahigh temperature (the maximum using temperature is 1800 ℃), and the coating has higher infrared radiationPerformance; the high-refractive-index heat-insulating coating comprises a heat-insulating transition layer (inner layer) and a high-emissivity coating (outer layer), wherein the heat-insulating transition layer is mainly made of electrofused zirconia hollow spheres, so that zirconia has a high melting point and can be guaranteed not to have internal structural change after being used at 1800 ℃ for a long time after being electrofused, and the thermal conductivity of the zirconia material is low and is applied to the surface of the inner wall of a kiln as a coating, so that the loss of heat through the wall of the kiln can be further reduced; high-emissivity Me-LaAlO prepared by high-temperature solid-phase synthesis of high-emissivity coating material3-La2Zr2O7-ZrO2The ternary eutectic oxide ceramic material provides high infrared radiance for the coating; in addition, the double-coating structure design is characterized in that: on the one hand by means of ZrO2The barrier effect of the transition layer prevents or slows down the SiO in the outer infrared coating and the aluminum-silicon refractory material matrix2Thereby effectively suppressing the attenuation of emissivity; on the other hand, the inner layer ZrO2The coating can generate ZrSiO through reaction with the matrix part of the aluminum-silicon refractory material4So as to form firm interface combination, thereby avoiding the cracking and peeling of the coating; simultaneous transition layer (ZrO)2) With an infrared coating (Me-LaAlO)3/La2Zr2O7/ZrO2) Belongs to hypoeutectic components, and has good high-temperature chemical compatibility. Thus in ZrO2The surface of the coating is adhered with Me-LaAlO3-La2Zr2O7-ZrO2The ternary eutectic ceramic coating can achieve the effect of long-acting energy conservation.
The ultra-high temperature infrared high-radiation heat-preservation energy-saving coating has the beneficial effects that:
high temperature resistance: the invention selects the high-temperature resistant fused zirconia hollow sphere and Me-LaAlO3-La2Zr2O7-ZrO2The ternary eutectic oxide is used as a coating material, the selected binding agent is an organic binding agent which is burnt at high temperature and cannot influence the high-temperature resistance of the coating, and the maximum service temperature of the coating prepared by the invention can reach 1800 ℃.
And (3) firm bonding: thermal insulation transition layer (ZrO)2Coating) can form ZrSiO by reaction with the matrix portion of the alumino-silica based refractory4To form a firm interface bond, thereby preventing the coating from cracking and peeling
Low thermal conductivity and high emissivity: the zirconia material selected for the inner layer coating has low self thermal conductivity and is a hollow sphere, so that the heat can be effectively prevented from being transferred outwards, and the Me-LaAlO3-La2Zr2O7-ZrO2The material has high radiation and low heat conductivity, so that the heat in the kiln can be effectively utilized.
High stability: the inner layer coating mainly comprises electric melting raw materials, so that the coating can be ensured not to generate structural and performance changes after being used at high temperature for a long time, and lanthanum aluminate and lanthanum zirconate also have high structural stability at high temperature.
Detailed Description
The invention is illustrated with reference to the examples given:
example 1: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 45 parts of fused zirconia hollow spheres, 15 parts of fused white corundum micropowder, 20 parts of waterborne polyurethane resin and 20 parts of deionized water, and 0.1 part of sodium tripolyphosphate dispersing agent, 0.5 part of carboxymethyl cellulose thickening agent and 0.05 part of G60 defoaming agent produced by chemical industry of sima are additionally added; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO250 parts of materials (30 parts of lanthanum oxide, 25 parts of aluminum oxide, 20 parts of zirconium oxide, 5 parts of calcium oxide and 20 parts of chromium oxide), 25 parts of waterborne polyurethane resin and 25 parts of deionized water, and additionally 0.1 part of sodium tripolyphosphate dispersing agent, 0.5 part of carboxymethyl cellulose thickening agent and 0.05 part of G60 defoaming agent produced by the chemical industry of sima are added.
Example 2: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 45 parts of fused zirconia hollow spheres, 10 parts of tabular corundum micropowder, 25 parts of water-based acrylic resin and 20 parts of deionized water, and additionally 0.2 part of sodium hexametaphosphate dispersant, 0.3 part of carboxymethyl cellulose thickener and 0.15 part of G60 defoamer produced by chemical industry of sima are added; height ofThe emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO250 parts of materials (35 parts of lanthanum oxide, 15 parts of aluminum oxide, 20 parts of zirconium oxide, 5 parts of barium oxide, 5 parts of magnesium oxide, 10 parts of ferric oxide and 10 parts of nickel oxide), 15 parts of water-based acrylic resin and 35 parts of deionized water, and additionally 0.1 part of sodium tripolyphosphate dispersing agent, 0.3 part of carboxymethyl cellulose thickening agent and 0.05 part of G60 defoaming agent produced by the chemical industry of sima are added.
Example 3: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 40 parts of fused zirconia hollow spheres, 25 parts of fused white corundum micropowder, 10 parts of waterborne polyurethane resin and 25 parts of deionized water, and additionally 0.2 part of CAMTMENT FS20 dispersant, 0.3 part of carboxymethyl cellulose thickener and 0.15 part of G60 defoamer produced by chemical industry of sima are added; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO245 parts of materials (55 parts of lanthanum oxide, 25 parts of aluminum oxide, 10 parts of zirconium oxide, 1 part of magnesium oxide, 4 parts of chromium oxide and 5 parts of nickel oxide), 25 parts of waterborne polyurethane resin and 30 parts of deionized water, and additionally 0.2 part of CAMTMENT FS20 dispersant, 0.5 part of carboxymethyl cellulose thickener and 0.15 part of G60 defoamer produced by the chemical industry of sima are added.
Example 4: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 30 parts of fused zirconia hollow spheres, 20 parts of fused white corundum micropowder, 10 parts of waterborne polyurethane resin and 40 parts of deionized water, and additionally 0.1 part of CAMTMENT FS20 dispersant, 0.5 part of carboxymethyl cellulose thickener and 0.05 part of G60 defoamer produced by chemical industry of sima are added; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO250 parts of materials (45 parts of lanthanum oxide, 20 parts of aluminum oxide, 20 parts of zirconium oxide, 1 part of strontium oxide, 1 part of iron oxide and 13 parts of nickel oxide), 35 parts of waterborne polyurethane resin and 15 parts of deionized water, and additionally 0.1 part of CAMTMENT FS20 dispersant, 0.5 part of carboxymethyl cellulose thickener and 0.1 part of G60 defoamer produced by the chemical industry of sima are added.
Example 5: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 35 parts of fused zirconia hollow spheres, 5 parts of fused white corundum micropowder, 10 parts of tabular corundum micropowder, 25 parts of waterborne polyurethane resin and 25 parts of deionized water, wherein 0.2 part of sodium tripolyphosphate dispersing agent, 0.3 part of carboxymethyl cellulose thickening agent and 0.15 part of G60 defoaming agent produced by the chemical industry of sima are additionally added; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO230 parts of materials (40 parts of lanthanum oxide, 20 parts of aluminum oxide, 10 parts of zirconium oxide, 5 parts of strontium oxide, 5 parts of calcium oxide, 5 parts of barium oxide, 5 parts of magnesium oxide and 10 parts of cobalt oxide), 40 parts of waterborne polyurethane resin and 30 parts of deionized water, and additionally 0.1 part of sodium tripolyphosphate dispersing agent, 0.5 part of carboxymethyl cellulose thickening agent and 0.05 part of G60 defoaming agent produced by the chemical industry of sima are added.
Example 6: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 45 parts of fused zirconia hollow spheres, 10 parts of fused white corundum micropowder, 10 parts of tabular corundum micropowder, 25 parts of water-based acrylic resin and 100 parts of deionized water, wherein 0.2 part of CAMTMENT FS20 dispersant, 0.3 part of carboxymethyl cellulose thickener and 0.15 part of G60 defoamer produced by the chemical industry of sima are additionally added; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO235 parts of materials (49 parts of lanthanum oxide, 20 parts of aluminum oxide, 10 parts of zirconium oxide, 1 part of calcium oxide, 5 parts of chromium oxide, 5 parts of ferric oxide, 5 parts of cobalt oxide and 5 parts of nickel oxide), 15 parts of waterborne polyurethane resin and 50 parts of deionized water, and additionally 0.2 part of sodium tripolyphosphate dispersing agent, 0.5 part of carboxymethyl cellulose thickening agent and 0.05 part of G60 defoaming agent produced by the chemical industry of sima are added.
Example 7: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 35 parts of fused zirconia hollow spheres, 8 parts of fused white corundum micropowder, 12 parts of tabular corundum micropowder, 20 parts of waterborne polyurethane resin and 25 parts of deionized water, and 0.2 part of sodium tripolyphosphate dispersant and 0.3 part of sodium tripolyphosphate dispersant are addedCarboxymethyl cellulose thickener and 0.15 part of G60 defoamer produced by span chemical industry; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO240 parts of materials (40 parts of lanthanum oxide, 20 parts of aluminum oxide, 20 parts of zirconium oxide, 5 parts of strontium oxide, 5 parts of calcium oxide, 5 parts of barium oxide and 5 parts of cobalt oxide), 20 parts of waterborne polyurethane resin and 40 parts of deionized water, and additionally 0.1 part of sodium tripolyphosphate dispersing agent, 0.4 part of carboxymethyl cellulose thickening agent and 0.05 part of G60 defoaming agent produced by the chemical industry of sima are added.
Example 8: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 40 parts of fused zirconia hollow spheres, 15 parts of tabular corundum micropowder, 20 parts of waterborne polyurethane resin and 25 parts of deionized water, and additionally 0.2 part of CAMTMENT FS20 dispersant, 0.3 part of carboxymethyl cellulose thickener and 0.1 part of G60 defoamer produced by chemical industry of span are added; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO240 parts of materials (50 parts of lanthanum oxide, 10 parts of aluminum oxide, 20 parts of zirconium oxide, 5 parts of barium oxide, 5 parts of ferric oxide, 5 parts of nickel oxide and 5 parts of cobalt oxide), 25 parts of waterborne polyurethane resin and 35 parts of deionized water, and additionally 0.1 part of sodium tripolyphosphate dispersing agent, 0.5 part of carboxymethyl cellulose thickening agent and 0.15 part of G60 defoaming agent produced by the chemical industry of sima are added.
Example 9: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 45 parts of fused zirconia hollow spheres, 9 parts of tabular corundum micropowder, 6 parts of fused white corundum micropowder, 15 parts of waterborne polyurethane resin and 25 parts of deionized water, wherein 0.2 part of CAMTMENT FS20 dispersant, 0.3 part of carboxymethyl cellulose thickener and 0.1 part of G60 defoamer produced by the chemical industry of sima are additionally added; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO245 parts of materials (55 parts of lanthanum oxide, 15 parts of aluminum oxide, 10 parts of zirconium oxide, 5 parts of barium oxide, 5 parts of iron oxide, 5 parts of nickel oxide and 5 parts of cobalt oxide), 30 parts of waterborne polyurethane resin, 25 parts of deionized water and the like0.1 part of sodium tripolyphosphate dispersant, 0.4 part of carboxymethyl cellulose thickener and 0.12 part of G60 defoamer produced by the chemical industry of sima are added.
Example 10: a high-emissivity heat-insulating coating comprises a heat-insulating transition layer and is composed of the following components in parts by weight: 40 parts of fused zirconia hollow spheres, 15 parts of tabular corundum micropowder, 10 parts of fused white corundum micropowder, 10 parts of waterborne polyurethane resin and 25 parts of deionized water, and additionally 0.2 part of CAMTMENT FS20 dispersant, 0.3 part of carboxymethyl cellulose thickener and 0.1 part of G60 defoamer produced by the chemical industry of Sema are added; the high emissivity coating comprises the following components in parts by weight3-La2Zr2O7-ZrO240 parts of materials (55 parts of lanthanum oxide, 15 parts of aluminum oxide, 10 parts of zirconium oxide, 1 part of barium oxide, 5 parts of ferric oxide, 5 parts of nickel oxide, 5 parts of cobalt oxide and 4 parts of chromium oxide), 30 parts of waterborne polyurethane resin and 30 parts of deionized water, and additionally 0.2 part of sodium tripolyphosphate dispersing agent, 0.5 part of carboxymethyl cellulose thickening agent and 0.12 part of G60 defoaming agent produced by the chemical industry of sima are added.
Claims (8)
1. A high emissivity thermal insulation coating is characterized in that: the high-emissivity heat-insulating coating is provided with a heat-insulating transition layer and a high-emissivity coating; the high-emissivity coating is positioned outside the heat-preservation transition layer; the heat-insulating transition layer comprises the following raw materials in parts by weight: 30-45 parts of microporous electrofused zirconia hollow spheres, 10-25 parts of filler, 10-25 parts of binding agent and 10-40 parts of solvent, and in addition, 0.1-0.2 part of dispersing agent, 0.3-0.5 part of thickening agent and 0.05-0.15 part of defoaming agent are added;
the high-emissivity coating comprises the following raw materials in parts by weight: Me-LaAlO3-La2Zr2O7-ZrO230-50 parts of high-emissivity ceramic material, 15-40 parts of bonding agent and 15-50 parts of solvent, and additionally 0.1-0.2 part of dispersing agent, 0.3-0.5 part of thickening agent and 0.05-0.15 part of defoaming agent are added; the Me-LaAlO3-La2Zr2O7-ZrO2The high-emissivity material comprises the following raw materials in parts by weight: 30-55 parts of lanthanum oxide, 10-25 parts of aluminum oxide, 1-20 parts of zirconium oxide, 1-20 parts of dopant I and1-20 parts of a doping agent II; the raw materials are subjected to high-temperature solid phase reaction to prepare Me-LaAlO3-La2Zr2O7-ZrO2A high emissivity material; the doping agent I is one or a mixture of more of magnesium oxide, calcium oxide, barium oxide and strontium oxide, and the doping agent II is one or a mixture of more of chromium oxide, manganese oxide, iron oxide and cobalt oxide.
2. The high emissivity thermal barrier coating of claim 1, wherein: the granularity of the micropore electric melting zirconia hollow ball is less than or equal to 1 mm.
3. The high emissivity thermal barrier coating of claim 1, wherein: the filler is one or two of electric melting white corundum micro powder or tabular corundum micro powder, and the granularity of the micro powder is less than or equal to 0.088 mm.
4. The high emissivity thermal barrier coating of claim 1, wherein: the bonding agent is one of water-based polyurethane resin and water-based acrylic resin.
5. The high emissivity thermal barrier coating of claim 1, wherein: the solvent is deionized water.
6. The high emissivity thermal barrier coating of claim 1, wherein: the dispersing agent is one of sodium tripolyphosphate, sodium hexametaphosphate and polyethylene glycol type water reducing agent CAMTMENT FS20 produced by Pasteur Germany.
7. The high emissivity thermal barrier coating of claim 1, wherein: the thickening agent is carboxymethyl cellulose.
8. The high emissivity thermal barrier coating of claim 1, wherein: the defoaming agent is a G60 defoaming agent produced by the chemical industry of the sima.
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| CN111825442B (en) * | 2020-07-21 | 2023-04-07 | 长沙麓桥科技有限公司 | Sr, ni and Cr co-doped LaAlO 3 Method for preparing ceramic material and product thereof |
| CN114685151A (en) * | 2020-12-31 | 2022-07-01 | 张海鑫 | Coating for improving radiance and preparation method thereof |
| CN112592178B (en) * | 2021-01-13 | 2022-07-05 | 中钢集团洛阳耐火材料研究院有限公司 | High-emissivity heat-insulation composite refractory coating |
| CN113105214B (en) * | 2021-04-13 | 2023-03-28 | 湘潭大学 | Ceramic material with low infrared emissivity in middle and far infrared bands and preparation method and application thereof |
| CN114230379B (en) * | 2022-01-06 | 2022-11-29 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of SiC aerogel/ceramic coating structure integrated heat-insulation-preventing composite material |
| CN116288113A (en) * | 2023-03-28 | 2023-06-23 | 中钢集团洛阳耐火材料研究院有限公司 | High emissivity thermal protection coating |
| CN117866481B (en) * | 2023-12-25 | 2024-07-12 | 湛江卷烟包装材料印刷有限公司 | High-adhesiveness water-based printing ink and preparation method thereof |
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