CN114349521B - High-strength nano heat-insulating plate and preparation method thereof - Google Patents
High-strength nano heat-insulating plate and preparation method thereof Download PDFInfo
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- CN114349521B CN114349521B CN202111487458.0A CN202111487458A CN114349521B CN 114349521 B CN114349521 B CN 114349521B CN 202111487458 A CN202111487458 A CN 202111487458A CN 114349521 B CN114349521 B CN 114349521B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B80/00—Architectural or constructional elements improving the thermal performance of buildings
- Y02B80/10—Insulation, e.g. vacuum or aerogel insulation
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Abstract
The invention discloses a high-strength nano heat-insulating plate, which comprises the following components in percentage by weight: 43-75% of heat insulation filler; 7 to 15 percent of opacifier; 10 to 20 percent of binder; 2 to 6 percent of reinforcing fiber; 0.5 to 2 percent of plasticizer; 1 to 5 percent of performance additive; 3 to 10 percent of water; the nano plate prepared by the invention has the characteristics of low cost, high normal-temperature compressive strength and low heat conductivity coefficient. The invention introduces alkali or alkali metal salt, and utilizes the characteristics of low melting point, easy volatilization and reaction with aluminum-silicon material, so that the heat-insulating plate can form new structure reinforcing phase in situ under service state, and generate larger volume expansion, thereby avoiding the phenomena of burning strength or pulverization of the traditional heat-insulating plate material in the long-term use process. The high-strength nano heat insulation plate has good heat insulation performance, can maintain enough strength at normal temperature and high temperature to avoid losing effect, and has outstanding innovation and economic value.
Description
Technical Field
The invention belongs to the field of materials, and particularly relates to a high-strength nano heat-insulating plate and a preparation method thereof.
Background
The energy consumption of the steel industry in China is generally high, energy conservation and consumption reduction become important targets of enterprises, the reasonable and effective reduction of the temperature drop of molten steel in metallurgical containers such as steel ladles and the like is an important link of a metallurgical process, and an important factor determining the temperature drop of the molten steel is the heat preservation performance of furnace lining materials of the metallurgical containers such as the steel ladles and the like. At present, the heat insulation material of the furnace lining of the metallurgical container mainly adopts light castable, fiber heat insulation plates, nano heat insulation plates and the like for heat insulation, wherein the heat insulation effect of the nano heat insulation plates is the best.
The nanometer heat insulating board is a plate-shaped heat insulating product formed by mixing and pressing superfine SiO2 powder serving as a main component. Chinese patent No. CN 105541313B discloses a nano-insulation material and a method for preparing a nano-plate, wherein the nano-plate has a compressive strength at normal temperature of 1.2-1.4 MPa, a thermal conductivity of 0.02-0.029W/m and a temperature of K (600 ℃); chinese patent No. CN 102853211A discloses a high-efficiency nano insulation plate for thermal equipment and a manufacturing method thereof, wherein the product has a compressive strength at normal temperature of 3Mpa and a thermal conductivity coefficient at normal temperature of 0.021W/m £ K.
At present, the heat preservation effect of a steel ladle and other metallurgical containers is fully considered by the structural design of the steel ladle and other metallurgical containers, so that a nano heat insulation plate material with low heat conductivity coefficient is adopted, but in the using process, particularly in the later service life of the steel ladle, a steel ladle lining expands a steel ladle working lining and a permanent lining brick body through the heating of high-temperature molten steel, and in addition, the static pressure of the molten steel and the heating deformation of a cladding can enable the nano heat insulation plate to be extruded, meanwhile, the nano heat insulation plate contains more organic matters, the high temperature is easy to lose efficacy, and the material is further sintered and pulverized, so that the good heat preservation effect is lost.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a nano heat-insulating plate which is prepared from solid waste brown and has high strength and low heat conductivity coefficient, and the nano heat-insulating plate can improve the reliability of the nano heat-insulating plate in the using process of metallurgical containers such as steel ladles.
The technical scheme is as follows: the invention relates to a high-strength nano heat insulation plate, which comprises the following components in percentage by weight:
wherein the heat insulation filler is one or more of brown corundum smoke dust, white carbon black and floating beads, and the particle size of the heat insulation filler is less than or equal to 0.2mm; the performance additive is alkali or alkali metal salt, and has chemical formula of ROH and R 2 CO 3 R is Li, na or K, and the granularity of the R is less than 0.044mm.
Further, the opacifier is one or two of nano silicon carbide and nano zircon, and the particle size is less than 200nm.
Further, the binder is magnesium aluminum silicate, and the particle size is less than 0.044mm.
Further, the reinforcing fiber is one or two of alumina fiber, zirconia fiber or aluminum silicate fiber, and the fiber length is less than 5mm.
Further, the plasticizer is magnesium stearate with the granularity of less than 0.044mm.
The invention relates to a preparation method of a high-strength nano heat-insulating plate, which comprises the following steps:
(1) Preparing raw materials according to a ratio, mixing the reinforced fibers and the plasticizer, and dispersing by using a mechanical stirring or ultrasonic dispersing instrument;
(2) Mixing the mixture with heat insulating filler, opacifier, adhesive, plasticizer and performance additive in a stirrer, and adding water for mixing to obtain pug;
(3) The pug is prepared into plates with different sizes by a compression molding process, and the plates are dried and vacuum-packaged by using films or tinfoil.
Further, the mixing time is 1-3 h.
Further, the mixing time is 20-60 min.
Further, the drying temperature is 100-150 ℃.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages:
(1) The nano plate prepared by the invention has the characteristics of low cost, high normal-temperature compressive strength and low heat conductivity coefficient. The selected heat insulation filler is a raw material with low heat conductivity coefficient and light weight, the nano silicon carbide and the nano zircon are used as opacifiers to obviously inhibit the radiation heat transfer of the heat insulation plate in a service state, the magnesium stearate is used as a plasticizer, the lubricating and plasticizing effects are good, the density is light, the fibers are easy to disperse, the pug obtained by mixing has good fluidity and compressibility, the pug volatilizes at the temperature of 200 ℃, the porosity is increased, and the heat insulation is facilitated. Magnesium aluminum silicate is used as a binder, is particularly suitable for bonding powder, and is different from other organic binders, and cannot move to the surface of the heat insulation plate in the drying process. This non-moving property is essential to ensure the structural uniformity of the product. The invention introduces alkali or alkali metal salt at the same time, and utilizes the characteristics of low melting point, easy volatilization and reaction with aluminum-silicon material: r (OH) + SiO 2 /Al 2 O 3 →R 2 SiO 3 /RAlO 2 +H 2 O；R 2 CO 3 +SiO 2 /Al 2 O 3 →R 2 SiO 3 /RAlO 2 +CO 2 . The reaction enables the heat insulation plate to be in serviceThe new structure reinforcing phase is formed in situ, and simultaneously, larger volume expansion is generated, so that the phenomenon of burning or pulverization of the traditional heat insulation plate material in the long-term use process is avoided. As can be seen from the above, the high-strength nano heat-insulating plate has good heat-insulating property, can maintain sufficient strength at both normal temperature and high temperature to avoid losing effect, and has outstanding innovativeness and economic value, and the high-strength nano heat-insulating plate has the following characteristics:
(2) The preparation method disclosed by the invention is simple, efficient, green and environment-friendly, and is suitable for large-scale production.
Detailed Description
The technical solution of the present invention is further explained below.
Example 1
Selecting the weight percentage mixture ratio, wherein the heat insulation filler is 20 percent of brown corundum smoke dust, 20 percent of white carbon black and 35 percent of floating beads, and the particle size is less than or equal to 0.2mm; the selected opacifier is 3 percent of nano silicon carbide and 4 percent of nano zirconite, and the granularity is less than 200nm; the adhesive used firstly is 10 percent of magnesium aluminum silicate, and the granularity is less than 0.044mm; the selected reinforced fibers are 1 percent of alumina fibers and 1 percent of aluminum silicate fibers, and the length of the fibers is less than 5mm; the selected plasticizer is magnesium stearate 2%, and the granularity is less than 0.044mm; the selected performance additive is LiOH1 percent and is less than 0.044mm; and 3% of water.
Preparing the raw materials according to the proportion, firstly mixing the reinforcing fiber and the magnesium stearate, dispersing by using a mechanical stirring or ultrasonic dispersion instrument, then mixing the mixture with the heat insulation filler, the opacifier, the binder, the plasticizer and the performance additive in a stirrer for 1h, adding a proper amount of water, mixing for 20min to obtain pug, preparing the pug into plates with different sizes by using a compression molding process, drying at 100 ℃, and performing vacuum packaging by using a film.
Example 2
Selecting the weight fraction ratio, wherein the heat insulation filler is 20 percent of brown corundum smoke dust and 23 percent of white carbon black, and the particle size of the selected heat insulation filler is less than or equal to 0.2mm; the selected opacifier is 15% of nano zircon, and the granularity is less than 200nm; the binder is 20 percent of magnesium aluminum silicate, and the granularity is less than 0.044mm; the selected reinforced fiber is zirconia fiber 6%, and the fiber length is less than 5mm; the selected plasticizer is magnesium stearate 1%, and the granularity is less than 0.044mm; the selected performance additive is Na2CO 35 percent, and the granularity is less than 0.044mm; 10 percent of water.
Preparing the raw materials according to the proportion, firstly mixing the reinforcing fiber and the magnesium stearate, dispersing by using a mechanical stirring or ultrasonic dispersion instrument, then mixing the raw materials with the heat insulation filler, the opacifier, the binder, the plasticizer and the performance additive in a stirrer for 3h, adding a proper amount of water, mixing for 60min to obtain pug, preparing the pug into plates with different sizes by using a compression molding process, drying at 150 ℃, and carrying out vacuum packaging by using a film or tinfoil.
Example 3
Selecting the weight fraction ratio, wherein the heat insulation filler is 20 percent of white carbon black and 36 percent of floating beads, and the particle size of the selected heat insulation filler is less than or equal to 0.1mm; the selected opacifier is 12 percent of nano silicon carbide, and the granularity is less than 150nm; the binder is 15% of magnesium aluminum silicate, and the granularity is less than 0.030mm; the selected reinforced fibers are 2 percent of alumina fibers and 3 percent of zirconia fibers, and the length of the fibers is less than 5mm; the selected plasticizer is magnesium stearate 0.5%, and the granularity is less than 0.044mm; the selected performance additive is Li2CO 34%, and the granularity is less than 0.044mm; and 7.5 percent of water.
The raw materials are prepared according to the proportion, the reinforcing fiber and the magnesium stearate are mixed firstly, the mixture is dispersed by a mechanical stirring or ultrasonic dispersion instrument, then the mixture is mixed with the heat insulation filler, the opacifier, the binder, the plasticizer and the performance additive in a stirrer for 2 hours, a proper amount of water is added for mixing for 40min to obtain pug, the pug is prepared into plates with different sizes by a compression molding process, the plates are dried at 120 ℃, and the plates are packed by tinfoil in vacuum.
Example 4
Selecting the weight fraction ratio, wherein the heat insulation filler is floating bead 63%, and the particle size of the selected heat insulation filler is less than or equal to 0.2mm; the selected opacifier is 6 percent of nano silicon carbide, 6 percent of nano zirconite and the granularity is less than 150nm; the binder is 12 percent of magnesium aluminum silicate, and the granularity is less than 0.030mm; the selected reinforced fiber is 3 percent of aluminum silicate fiber, and the length of the fiber is less than 5mm; the selected plasticizer is magnesium stearate 1.5%, and the granularity is less than 0.044mm; the selected performance additive is KOH 2 percent, and the granularity is less than 0.044mm; 6.5 percent of water.
The raw materials are prepared according to the proportion, the reinforcing fiber and the magnesium stearate are mixed firstly, the mixture is dispersed by a mechanical stirring or ultrasonic dispersion instrument, then the mixture is mixed with the heat insulation filler, the opacifier, the binder, the plasticizer and the performance additive in a stirrer for 1.5h, then a proper amount of water is added for mixing for 30min to obtain pug, the pug is prepared into plates with different sizes by a compression molding process, the plates are dried at 110 ℃, and the plates are packed by films in vacuum.
Claims (7)
1. A high-strength nano heat insulation plate is characterized by comprising the following components in percentage by weight:
43 to 75 percent of heat insulation filler;
7 to 15 percent of opacifier;
10 to 20 percent of binder;
2 to 6 percent of reinforcing fiber;
0.5 to 2 percent of plasticizer;
1 to 5 percent of performance additive;
3 to 10 percent of water;
wherein the heat insulation filler is one or more of brown corundum smoke dust, white carbon black and floating beads, and the particle size of the heat insulation filler is less than or equal to 0.2mm; the performance additive is alkali or alkali metal salt, and has chemical formula of ROH and R 2 CO 3 R is Li, and the granularity of the Li is less than 0.044mm; the plasticizer is magnesium stearate with the granularity less than 0.044mm.
2. A high strength nanoscopic insulation panel as claimed in claim 1 wherein said opacifier is one or both of nano silicon carbide and nano zircon and has a particle size of less than 200nm.
3. A high strength nanoscopic insulation panel as recited in claim 1 wherein said binder is magnesium aluminum silicate with a particle size of < 0.044mm.
4. The high strength nanoscopic insulation panel of claim 1 wherein said reinforcing fibers are one or both of alumina fibers, zirconia fibers or alumina silicate fibers, and the fiber length is < 5mm.
5. A method for preparing a high-strength nano insulation board according to claim 1, comprising the steps of:
(1) Preparing raw materials according to a ratio, mixing the reinforced fibers and the plasticizer, and dispersing by using a mechanical stirring or ultrasonic dispersing instrument;
(2) Mixing the mixture with heat insulating filler, opacifier, adhesive, plasticizer and performance additive in a stirrer, and adding water for mixing to obtain pug;
(3) The pug is prepared into plates with different sizes by a compression molding process, and the plates are dried and vacuum-packaged by using films or tinfoil.
6. The method for preparing the high-strength nano insulation board according to claim 5, wherein the mixing time is 1 to 3 hours.
7. The preparation method of the high-strength nano heat insulation plate according to claim 5, wherein the mixing time is 20 to 60min.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111487458.0A CN114349521B (en) | 2021-12-07 | 2021-12-07 | High-strength nano heat-insulating plate and preparation method thereof |
| PCT/CN2022/119193 WO2023103510A1 (en) | 2021-12-07 | 2022-09-16 | High-strength nano heat insulation plate and preparation method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111487458.0A CN114349521B (en) | 2021-12-07 | 2021-12-07 | High-strength nano heat-insulating plate and preparation method thereof |
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| CN114349521A CN114349521A (en) | 2022-04-15 |
| CN114349521B true CN114349521B (en) | 2023-04-11 |
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| CN114349521B (en) * | 2021-12-07 | 2023-04-11 | 南京钢铁股份有限公司 | High-strength nano heat-insulating plate and preparation method thereof |
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| DE2942180C2 (en) * | 1979-10-18 | 1985-02-21 | Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen | Process for the production of a heat insulating body |
| DE19644282A1 (en) * | 1996-10-24 | 1998-04-30 | Wacker Chemie Gmbh | Insulating molded body and process for its production |
| CN101671158B (en) * | 2008-09-10 | 2012-10-03 | 上海船舶工艺研究所 | Silicon dioxide heat insulator and preparation method thereof |
| CN104973868B (en) * | 2014-04-14 | 2017-08-11 | 郑州东方炉衬材料有限公司 | High-strength high-alumina light heat-insulating fire resistant brick and its production method |
| US11274212B2 (en) * | 2018-05-19 | 2022-03-15 | Cbg Systems International Pty Ltd | Thermal and/or fire resistant panel, a mounting assembly, and a kit |
| CN114349521B (en) * | 2021-12-07 | 2023-04-11 | 南京钢铁股份有限公司 | High-strength nano heat-insulating plate and preparation method thereof |
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| WO2023103510A1 (en) | 2023-06-15 |
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