Infrared radiation coating for funeral cremator as well as preparation method and application of infrared radiation coating

Abstract

The invention provides an infrared radiation coating for a funeral cremator, the infrared radiation coating comprises an infrared radiation agent, an infrared radiation improver, a binder and a coating additive, the infrared radiation improver comprises acetylene black and / or ferrotitanium powder, and the infrared radiation agent comprises silicon oxide, magnesium oxide, manganese sesquioxide, iron sesquioxide and copper oxide. The invention also provides a method and application of the infrared radiation coating. According to the infrared radiation coating provided by the invention, the infrared radiance of the coating can be improved, the stability of the infrared radiance of the coating can also be ensured, meanwhile, the use temperature can reach up to 1800 DEG C, and the temperature resistance characteristic of the high-performance infrared radiation coating is achieved; the cost is lower, and the economic value is higher.

Description

Technical Field

[0001] The present invention relates to the field of coating technology, and in particular to an infrared radiation coating for a funeral crematorium, and also to a preparation method and application of the infrared radiation coating. Background Art

[0002] In my country, the energy consumption of industrial kilns accounts for about 60% of the national industrial energy consumption and 25% of the national total energy consumption. However, the average thermal efficiency of industrial kilns in my country is less than 30%, while the average thermal efficiency of industrial kilns in the world is more than 50%. Among them, the cremation furnaces for funerals and funerals have the characteristics of high variable properties, high moisture content and high fat content of the combustible materials being heated during the cremation process, which leads to low fuel heat utilization, large fuel consumption and lower thermal efficiency.

[0003] Therefore, the energy saving of industrial kilns has considerable potential. At present, the energy-saving methods and technologies of industrial kilns mainly include high-efficiency combustion technology, waste heat recovery and utilization, new furnace structure, infrared radiation coatings, etc. As a new energy-saving technology in industrial kilns, infrared radiation coatings have the advantages of low investment and quick results compared with other energy-saving technologies for industrial kilns. During the specific construction, it is generally not necessary to make special modifications to the industrial kiln substrate. Normal coating construction can be carried out during the maintenance process, so it has the characteristics of convenient and fast construction. As a new energy-saving material on industrial kilns, its application in industrial kilns can achieve good energy-saving effects. At the same time, it has a good protective effect on the substrate material, which can extend the service life of industrial kilns, reduce the maintenance workload of kilns, and reduce the operating costs of industrial kilns. In addition, by strengthening the radiation heat transfer in the furnace, improving the temperature uniformity of heating in the furnace, improving the thermal efficiency of the furnace and the heating quality of the product, it has attracted much attention. As a new material in the energy saving of industrial kilns, infrared radiation coatings have strong vitality and broad application prospects.

[0004] The heat-resistant temperature of ordinary infrared radiation coatings is usually around 1300 to 1500 degrees. Above 1500 degrees, problems such as cracking and peeling will occur, resulting in poor temperature uniformity in the furnace, very low emissivity, and infrared emissivity usually does not exceed 0.6. In order to increase the fire-resistant temperature, some studies have added transition metal oxides such as yttrium oxide, cobalt oxide, chromium oxide and other materials to the coating, or added materials such as graphene or carbon nanotubes, which are very expensive and the cost of the coating remains high. Therefore, there is an urgent need for a coating with low cost and high fire resistance. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an infrared radiation coating for funeral crematoriums, which can solve the problems of high coating cost, insufficient fire resistance, low infrared radiation rate, etc. in the prior art.

[0006] According to one aspect of the present invention, there is provided an infrared radiation coating for a funeral crematorium, comprising an infrared radiation agent, an infrared radiation modifier, a binder and a coating additive, wherein the infrared radiation modifier comprises acetylene black and / or ferrotitanium powder, and the infrared radiation agent comprises silicon oxide, magnesium oxide, manganese trioxide, iron trioxide and copper oxide.

[0007] According to the present invention, the infrared radiation modifier including acetylene black and / or ferrotitanium powder is used to improve the infrared radiation performance and temperature resistance of the coating; the composition is controllable and the price is relatively low; energy saving and emission reduction are also achieved.

[0008] According to a specific embodiment of the present invention, based on the total weight of the infrared radiation coating, the content of the infrared radiation modifier is 1-10wt%, preferably 2-8wt%, more preferably 2-6wt%, such as 3wt%, 4wt%, 5wt%. The use of the infrared radiation modifier within the above range has the effect of further improving the infrared radiation performance and temperature resistance of the coating.

[0009] According to a specific embodiment of the present invention, the infrared radiation modifier includes acetylene black and ferrotitanium powder, and the mass ratio of acetylene black to ferrotitanium powder is 1:1 to 1:6, preferably 1:2 to 1:5, such as 1:3 and 1:4. The compounded acetylene black and ferrotitanium powder can produce a synergistic effect, which can further significantly improve the infrared radiation performance, reduce the cost, and make the dispersion uniformity of the modifier better; further improve the infrared radiation performance and temperature resistance of the coating.

[0010] According to the present invention, acetylene black is a special carbon black, which is obtained by continuous pyrolysis of acetylene with a purity of more than 99% obtained by decomposition and refining of by-product gas during the pyrolysis of calcium carbide or naphtha (raw gasoline), and the carbon black is obtained. Ferrotitanium powder is an alloy powder containing ferrotitanium elements, which is a powder obtained by micronizing ilmenite. In the ferrotitanium powder, the titanium content, calculated as titanium oxide, is 20-60wt%, such as 25-40wt%, such as 25wt%, 30wt%, 35wt%. In a specific embodiment, ferrotitanium powder with a low titanium content is used, and the color is darker.

[0011] According to a specific embodiment of the present invention, based on the total weight of the infrared radiation coating, the content of the infrared radiation agent is 30-44wt%, preferably 31-36wt%. According to a specific embodiment of the present invention, based on the total weight of the infrared radiation coating, in the infrared radiation agent, the content of silicon oxide (SiO2) is 12-16wt%, such as 13-14wt%, the content of magnesium oxide (MgO) is 6-10wt%, such as 7-8wt%, the content of manganese trioxide (Mn2O3) is 5-8wt%, such as 5-6wt%; the content of ferric oxide (Fe2O3) is 4-6wt%, such as 4-5wt%, and the content of copper oxide (CuO) is 2-4wt%, such as 2-3wt%. Among them, silicon oxide, such as commercially available silicon dioxide powder or quartz powder can be used. Ferrous oxide, such as iron red powder can be used. The infrared radiation agent of the present invention is low in price and can effectively reduce costs; and can work together with the infrared radiation modifier in the present invention, has a high infrared radiation rate, and high fire resistance.

[0012] According to a specific embodiment of the present invention, a binder is added to increase the viscosity of the coating. Based on the total weight of the infrared radiation coating, the content of the binder is 50-60wt%. The binder used includes inorganic binders such as silicates, silica sols, aluminum dihydrogen phosphate, etc. and oxides such as zirconium oxide, wherein the content of oxides such as zirconium oxide in the binder is 2-10wt%. In a specific embodiment, the binder includes silica sol and zirconium oxide; in the binder, the content of zirconium oxide is 2-10wt%, such as 2-5wt%, such as 3wt%, 4wt%. The use of a binder containing zirconium oxide can also improve the thermal stability of the coating at high temperatures.

[0013] According to a specific embodiment of the present invention, the infrared radiation coating comprises a coating additive; based on the total weight of the infrared radiation coating, the content of the coating additive is 3 to 5 wt %. The coating additive used may be a coating additive commonly used in the art, which helps to improve the coating performance and promote the formation of the coating film.

[0014] According to a specific embodiment of the present invention, the coating additives include a dispersant, a thickener, a pH regulator and a fungicide. Among them, the dispersant is a commonly used dispersant in the coating field, such as sodium hexametaphosphate, polyacrylamide, etc.; the thickener is a commonly used thickener in the coating field, such as a natural or synthetic polymer thickener, such as hydroxymethyl cellulose, methyl cellulose, soluble starch, polyoxyethylene, polyacrylate, etc.; the pH regulator can be a commonly used pH regulator in the coating field, such as alkyl alcohol amine, ammonia water, etc.; the fungicide can be a commonly used fungicide in the coating field, such as isothiazolinone derivatives (such as Nord C-15 fungicide), and Rohm and Haas fungicide can also be used.

[0015] Based on the total weight of the infrared radiation coating, the content of the dispersant is 0.5-1wt%, the content of the thickener is 1-2wt%, the content of the pH adjuster is 0.5-2wt%, and the content of the bactericide is 0.3-1wt%.

[0016] According to another aspect of the present invention, there is also provided a method for preparing the above-mentioned infrared radiation coating, comprising the following steps: S1, adding the infrared radiation agent into a ball milling container for ball milling; S2, adding the infrared radiation modifier into a ball milling container for ball milling; S3, adding the binder into a stirring container for stirring to obtain a stirred binder; S4, adding the coating additive to the binder stirred in step S3, and continuing stirring to obtain a mixture; S5, adding the infrared radiation agent ball-milled in step S1 and the infrared radiation modifier ball-milled in step S2 to the mixture in step S4, and continuing to stir to obtain the infrared radiation coating.

[0017] According to the preparation method of the present invention, the specific selection and proportion of each component are consistent with the above definition. Wherein, when the infrared radiation modifier is acetylene black and ferrotitanium powder, during the mixing process, the acetylene black will wrap the surface of the ferrotitanium powder.

[0018] According to the preparation method of the present invention, in the steps S1 and S2, the ball milling container is such as a ball mill, and the speed and time of the ball mill can be conventional speeds and times, such as 200-400 r / min, such as ball milling for 1-4 hours, such as ball milling for 2 hours at 350 r / min. The obtained infrared radiation auxiliary agent powder and infrared radiation modifier powder have a particle size commonly used in the coating field, which will not be described in detail here.

[0019] According to the preparation method of the present invention, in the steps S3-S5, the stirring container can be a stirring tank, and the stirring can be carried out at room temperature for 10 to 30 minutes, such as 20 minutes; the stirring speed can be selected according to needs and is not limited here.

[0020] According to the method provided by the present invention, the infrared radiation agent and the infrared radiation auxiliary agent are first ball-milled separately, and then mixed with the mixed binder and auxiliary agent to obtain the infrared radiation coating. The preparation method is simple, and the prepared infrared radiation coating has high infrared radiation rate, good stability, excellent high temperature resistance, low cost and good economic benefits.

[0021] According to another aspect of the present invention, the application of the infrared radiation coating or the infrared radiation coating prepared by the above method in a funeral crematorium is also provided. The infrared radiation coating according to the present invention has a high infrared radiation rate and maintains the stability of the infrared radiation rate. At the same time, the use temperature can be as high as 1800°C or above, achieving the temperature resistance characteristics of high-performance infrared radiation coatings, and the cost is low and has good economic value; the color is black, which conforms to the relevant traditions of the funeral industry and is particularly suitable for use in funeral crematoriums.

[0022] The infrared radiation coating for funeral crematorium provided by the present invention introduces acetylene black and / or ferrotitanium powder as infrared radiation modifiers, thereby eliminating expensive ingredients while maintaining high performance, and utilizing the special properties of acetylene black and / or ferrotitanium powder to improve the radiation performance of the coating. Therefore, the coating formula cost is relatively low.

[0023] Compared with the prior art, the advantages of the present invention are: acetylene black and / or ferrotitanium powder are introduced as infrared radiation modifiers, and the addition of infrared radiation modifiers can not only improve the infrared radiation rate of the coating, but also ensure the stability of the infrared radiation rate of the coating. At the same time, due to the doping of zirconium oxide, the use temperature can be as high as 1800°C or more, reaching the temperature resistance characteristics of domestic high-performance infrared radiation coatings of the same level, and its composition does not contain yttrium oxide, cobalt oxide, and chromium oxide components, and selects materials such as acetylene black and ferrotitanium powder and relatively cheap materials such as copper oxide, ferric oxide, and manganese oxide, which can effectively reduce production costs. The addition of infrared radiation modifiers significantly improves infrared radiation and greatly improves the radiation rate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in the present invention.

[0026] If no specific technology or conditions are specified in the examples of the present invention, the technology or conditions described in the literature in the field or the product instructions shall be followed. If the manufacturer of the devices, instruments, reagents, etc. is not specified, they are all conventional products that can be purchased through regular channels. The experimental reagents and raw materials involved are all commercially available.

[0027] The infrared emissivity in the present invention is tested by infrared spectrometer PE--750.

[0028] Embodiment 1: The infrared radiation agent is composed of 140g of quartz powder, 80g of magnesium oxide, 60g of manganese trioxide, 50g of iron red powder, and 30g of copper oxide. The infrared radiation modifier is acetylene black and ferrotitanium powder, including 10g of acetylene black and 50g of ferrotitanium powder, and the titanium content in the ferrotitanium powder is 40wt% in terms of titanium oxide. The binder is composed of 583g of silica sol and 12g of zirconium oxide. The coating additive is composed of a dispersant, a thickener, a pH regulator, and a bactericide, including 10g of sodium hexametaphosphate as the dispersant, 20g of hydroxymethyl cellulose as the thickener, 10g of organic alcohol amine CP-802 as the pH regulator, and 5g of C-15 as the bactericide.

[0029] Prepare as follows: S1, putting the base material for preparing the infrared radiation agent into a ball mill according to the above mass, and ball milling for 2 hours at a rotation speed of 350r / min for standby use; S2, putting the infrared radiation modifier into a ball mill according to the above mass, and milling at a speed of 350 r / min for 2 hours for standby use; S3, adding the binder according to the above mass into a mixing tank and stirring at high speed for 20 minutes; S4, putting the coating additive into the stirring tank where the operation in step S3) was completed, and stirring for 10 minutes; S5, add the infrared radiation agent and the infrared radiation modifier according to the formula mass into the stirring tank having completed the fourth step, and stir at a high speed for 30 minutes to obtain the desired coating.

[0030] The actual performance test experiment of the infrared radiation coating is as follows: the coating is evenly applied to the corundum substrate after surface cleaning using a piston air compressor, and then dried at 50°C for 2h and 100°C for 2h to obtain a coating with a thickness of 0.18mm. After testing, the infrared emissivity of the coating in the 3-5μm band is 0.938 at 400°C, and no cracks appear after sintering and heat preservation at 1500°C for 5h. The temperature resistance reaches 1850°C, and no cracking, blistering, etc. occur. The coating sample is placed in a heating furnace and heated to 1000°C and then kept warm for 30min. It is water quenched 20 times under the same conditions without cracking.

[0031] Example 2 Same as Example 1, except that 12 g of acetylene black and 48 g of ferrotitanium powder were used.

[0032] The coating test was the same as in Example 1. At 400° C., the infrared emissivity of the coating in the 3-5 μm band was 0.933, and no cracks, fissures, bubbles, or cracks were observed.

[0033] Example 3 Same as Example 1, except that, 15 g of acetylene black and 45 g of ferrotitanium powder are used.

[0034] The coating test was the same as in Example 1. At 400° C., the infrared emissivity of the coating in the 3-5 μm band was 0.940, and no cracks, fissures, bubbles, or cracks were observed.

[0035] Example 4 The same as Example 1, except that 20 g of acetylene black is used and no ferrotitanium powder is added.

[0036] The coating test was the same as in Example 1. At 400° C., the infrared emissivity of the coating in the 3-5 μm band was 0.88, and no cracks, fissures, bubbles, or cracks were observed.

[0037] Example 5 The same as Example 1, except that 60 g of titanium iron powder is used, no acetylene black is added, and the titanium content is 30 wt % calculated as titanium oxide.

[0038] The coating test was the same as in Example 1. At 400° C., the infrared emissivity of the coating in the 3-5 μm band was 0.86, and no cracks, fissures, bubbles, or cracks were observed.

[0039] Example 6 Same as Example 1, except that 30g of acetylene black was added, and no titanium iron powder was added. The coating test was the same as Example 1, and the infrared emissivity of the coating in the 3-5 μm band at 400° C. was 0.87, and no cracks, fissures, bubbles, or cracks were observed.

[0040] Example 7 The same as Example 1, except that 30g of titanium iron powder was added, and no acetylene black was added. The coating test was the same as Example 1, and the infrared emissivity of the coating in the 3-5 μm band at 400° C. was 0.85, and no cracks, fissures, bubbles, or cracks occurred.

[0041] Example 8 Same as Example 1, except that 10g of acetylene black and 20g of ferrotitanium powder were added. The coating test was the same as Example 1, and the infrared emissivity of the coating in the 3-5 μm band at 400° C. was 0.921, and no cracks, fissures, bubbles, or cracks were observed.

[0042] Example 9 Same as Example 1, except that 5g of acetylene black and 25g of ferrotitanium powder were added. The coating test was the same as Example 1, and the infrared emissivity of the coating in the 3-5 μm band at 400° C. was 0.925, and no cracks, fissures, bubbles, or cracks occurred.

[0043] Comparative Example 1 The same as Example 1, except that 60g of graphene and zirconium oxide (mass ratio is 1:9) are added. The coating test is the same as Example 1, and the infrared emissivity of the coating in the 3-5μm band at 400°C is 0.901, and no cracks, fissures, bubbles, cracks, etc. are found.

[0044] Table 1

[0045] It can be seen from Table 1 that the use of acetylene black and ferrotitanium powder as infrared radiation modifiers alone can obtain a material with high infrared emissivity and high temperature resistance without cracks, crazing, blistering, cracking, etc.; at the same time, the use of acetylene black and ferrotitanium powder as infrared radiation modifiers has a synergistic effect, which can further significantly improve the infrared emissivity, and the infrared emissivity is even as high as 0.94, with excellent performance. In addition, the infrared radiation coating of the present invention has a dark color, low cost, high infrared emissivity, good high temperature resistance, and good high temperature stability, and is particularly suitable for use in funeral crematoriums.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An infrared radiation coating for a funeral crematorium, comprising an infrared radiation agent, an infrared radiation modifier, a binder and a coating additive, wherein the infrared radiation modifier comprises acetylene black and / or ferrotitanium powder, and the infrared radiation agent comprises silicon oxide, magnesium oxide, manganese trioxide, iron trioxide and copper oxide.

2. The infrared radiation coating according to claim 1, characterized in that: Based on the total weight of the infrared radiation coating, the content of the infrared radiation modifier is 1 to 10 wt %, preferably 2 to 8 wt %, and more preferably 2 to 6 wt %.

3. The infrared radiation coating according to claim 2, characterized in that: The infrared radiation modifier comprises acetylene black and ferrotitanium powder, and the mass ratio of the acetylene black to the ferrotitanium powder is 1:1 to 1:6, preferably 1:2 to 1:

5.

4. The infrared radiation coating according to any one of claims 1 to 3, characterized in that: The titanium content in the titanium ferropowder, calculated as titanium oxide, is 20-60 wt %, preferably 25-40 wt %.

5. The infrared radiation coating according to any one of claims 1 to 4, characterized in that: Based on the total weight of the infrared radiation coating, the content of the infrared radiation agent is 30-44wt%, preferably 31-36wt%; and / or the content of the binder is 50-60wt%; and / or the content of the coating additive is 3-5wt%.

6. The infrared radiation paint according to claim 5, characterized in that: Based on the total weight of the infrared radiation coating, in the infrared radiation agent, the content of silicon oxide is 12-16wt%, the content of magnesium oxide is 6-10wt%, the content of manganese trioxide is 5-8wt%, the content of ferric oxide is 4-6wt%, and the content of copper oxide is 2-4wt%.

7. The infrared radiation paint according to claim 5, characterized in that: The binder includes silica sol and zirconium oxide. In the binder, the content of zirconium oxide is 2-10wt%, preferably 2-5wt%.

8. The infrared radiation paint according to claim 5, characterized in that: The coating additives include a dispersant, a thickener, a pH regulator and a bactericide; based on the total weight of the infrared radiation coating, the content of the dispersant is 0.5~1wt%, the content of the thickener is 1~2wt%, the content of the pH regulator is 0.5~1.5wt%, and the content of the bactericide is 0.3~1wt%.

9. A method for preparing the infrared radiation coating according to any one of claims 1 to 8, comprising the following steps: S1, adding the infrared radiation agent into a ball milling container for ball milling; S2, adding the infrared radiation modifier into a ball milling container for ball milling; S3, adding the binder into a stirring container for stirring to obtain a stirred binder; S4, adding the coating additive to the binder stirred in step S3, and continuing stirring to obtain a mixture; S5, adding the infrared radiation agent ball-milled in step S1 and the infrared radiation modifier ball-milled in step S2 to the mixture in step S4, and continuing to stir to obtain the infrared radiation coating.

10. Use of the infrared radiation coating according to any one of claims 1 to 8 or the infrared radiation coating prepared by the method according to claim 9 in a funeral crematorium.

Images