CN102964088A - Ultralow heat conductivity nano aerogel thermal insulation material and preparation method thereof - Google Patents
Ultralow heat conductivity nano aerogel thermal insulation material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an ultralow heat conductivity nano aerogel thermal insulation material and a preparation method thereof, belonging to the technical field of nano thermal insulation materials. The ultralow heat conductivity nano aerogel thermal insulation material comprises the following raw materials in percent by weight: 60-100 percent of nano-scale SiO2 powder, 0-30 percent of infrared opacifying agent, 0-10 percent of reinforced fibers and 0-5 percent of adhering agent. The ultralow heat conductivity nano aerogel thermal insulation material prepared by adopting the preparation method has a heat conductivity coefficient (heat surface 800 DEG C) being not more than 0.040w/m.k, a compression strength being not less than 0.7MPa and a volume weight being 250-400kg/m<3>. The ultralow heat conductivity nano aerogel thermal insulation material prepared by adopting the preparation method has the advantages of small heat conductivity coefficient and high compression strength, and is suitable for industrial furnaces and high-temperature devices in petrifaction, metallurgy, power and other fields.
Description
Technical field
The present invention relates to a kind of ultralow thermal conductivity nanoporous aerogel thermal insulation material and preparation method thereof, belong to the nano heat insulating material technical field.
Background technology
Industrial consumption energy is first of the large power consumption of China three, adopts insulating refractory at the industrial furnace such as petrochemical industry, metallurgy, electric power and high temperature service, is to realize energy-saving and cost-reducing important channel.The CSP line of metallurgy industry, the High Temperature Furnaces Heating Apparatus projects such as ethane cracking furnace of petrochemical industry to the requirement of insulating lining are: insulation thickness is about 330mm, and outside wall temperature requires to be lower than 70 ℃.Under the certain condition of insulation thickness, use ceramic fiber blanket, ceramic fiber module product not to reach the design requirements of outside wall temperature＜70 ℃, need to adopt that thermal conductivity is less, the type materials such as nanometer micropore thermal baffle of better heat preservation.Along with the development of nanotechnology, the nanometer SiO of ultralow thermal conductivity
2The micropore lagging material comes out, and is widely used abroad.Nanometer SiO
2The micropore lagging material is compared with heat-insulating material commonly used at present, and insulation effect can improve 2 ~ 10 times, can reduce thermal insulation layer thickness 30% ~ 50%, not only can improve effective working capacity but also can reduce a large amount of thermosteresis.
Summary of the invention
According to the deficiencies in the prior art, the technical problem to be solved in the present invention is: a kind of ultralow thermal conductivity nanoporous aerogel thermal insulation material is provided, and less, the better heat preservation of thermal insulation material thermal conductivity also can reduce thermal insulation layer thickness, reduces thermosteresis; Its preparation method is simple and convenient, is convenient to suitability for industrialized production.
The technical solution adopted for the present invention to solve the technical problems is: a kind of ultralow thermal conductivity nanoporous aerogel thermal insulation material is provided, it is characterized in that this thermal insulation material is made for by the raw material of following weight percentage:
Described this thermal insulation material is made for by the raw material of following weight percentage:
Described nano level SiO
2Powder is flame silicon ash, white carbon black, aerosil or aerosil.
Described fortifying fibre is a kind of or arbitrary combination in beta glass fibre, high silica fiber, aluminum silicate fiber, sapphire whisker, Zirconium oxide fibre and the basalt fibre.
Described infrared light screening agent is a kind of or arbitrary combination in titanium dioxide, ferric oxide, zirconium white, silicon carbide and the chromium sesquioxide.
Described binding agent is a kind of or arbitrary combination in polyvinyl alcohol, polyvinyl acetate (PVA) and the Polyvinylpyrolidone (PVP).
The preparation method of described ultralow thermal conductivity nanoporous aerogel thermal insulation material is characterized in that following steps:
(1), be 70 ~ 90% silicon-dioxide with weight percent with weight percent be that 0 ~ 10% fortifying fibre mixes, stir under the stirring velocity with 2000-5000r/min in the sealing stirrer, stir 5-30min, fortifying fibre is mixed in nano-powder;
(2), be that 0 ~ 30% opalizer adds in the mixing material of step (1) with weight percent, and add 0 ~ 5% binding agent, mix, obtain mixing material;
(3), above-mentioned mixing material is poured in the mould of definite shape, dry-pressing formed, then the heat-up rate of 2 ~ 6 ℃/min is warming up to 300 ~ 500 ℃, and insulation 1 ~ 4h namely obtains ultralow thermal conductivity nanometer micropore lagging material.
The invention has the beneficial effects as follows: the ultralow thermal conductivity nanometer micropore lagging material of the present invention's preparation, thermal conductivity (800 ℃ of hot sides)≤0.040w/m.k, compressive strength 〉=0.7MPa, unit weight are 250 ~ 400kg/m
3The ultralow thermal conductivity nanometer micropore lagging material of the present invention preparation, it is little to have a thermal conductivity, and compressive strength is high, is applicable on the industrial furnace such as petrochemical industry, metallurgy, electric power and the high temperature service; Less, the better heat preservation of thermal insulation material thermal conductivity also can reduce thermal insulation layer thickness, reduces thermosteresis; Its preparation method is simple and convenient, is convenient to suitability for industrialized production.
Embodiment
Below in conjunction with embodiment the present invention is described further:
Embodiment 1
A kind of preparation method of ultralow thermal conductivity nanometer micropore lagging material, its composition mass ratio is: nano silica powder 81%; Fortifying fibre 4%; Infrared light screening agent silicon carbide 12%; Binding agent 3%.
Nano level SiO
2Powder is flame silicon ash; Fortifying fibre is beta glass fibre; Binding agent is 1% polyvinyl alcohol and 2% polyvinyl acetate (PVA), adopts two-step approach to mix.At first nano silica powder and reinforcing glass fiber are joined in the Hermetical stirring device, rotating speed 3000r/min, stir after 20 minutes, in batch mixing, add infrared light screening agent and binding agent, mix, batch mixing is poured in the mould of definite shape, dry-pressing formed, then the heat-up rate of 3 ℃/min is warming up to 350 ℃, and insulation 2h namely obtains ultralow thermal conductivity nanometer micropore lagging material.
Product thermal conductivity of the present invention is 0.033w/m.k (800 ℃ of hot side), and compressive strength (thickness direction compression 10%) is 0.88MPa, and unit weight is 360kg/m
3
Embodiment 2
A kind of preparation method of ultralow thermal conductivity nanometer micropore lagging material, its proportion of composing is: nano silica powder 80%; Fortifying fibre 6%; Chromium sesquioxide 10%; Binding agent 4%.
Nano level SiO
2Powder is white carbon black; Fortifying fibre is 2% high silica fiber and 4% aluminum silicate fiber; Binding agent is Polyvinylpyrolidone (PVP), adopts two-step approach to mix.At first nano silica powder and fortifying fibre are joined in the Hermetical stirring device, rotating speed 3200r/min, stir after 15 minutes, in batch mixing, add infrared light screening agent and binding agent, mix, batch mixing is poured in the mould of definite shape, dry-pressing formed, then the heat-up rate of 4 ℃/min is warming up to 400 ℃, and insulation 3h namely obtains ultralow thermal conductivity nanometer micropore lagging material.
Product thermal conductivity of the present invention is 0.037w/m.k (800 ℃ of hot side), and compressive strength (thickness direction compression 10%) is 0.9MPa, and unit weight is 320kg/m
3
Embodiment 3
A kind of preparation method of ultralow thermal conductivity nanometer micropore lagging material, its proportion of composing is: nano silica powder 85%; Fortifying fibre 3%; Infrared light screening agent 7%; Binding agent 5%.
Nano level SiO
2Powder is aerosil; Fortifying fibre is the basalt fibre of 1% sapphire whisker, 1% Zirconium oxide fibre and 1%; Binding agent is 1% polyvinyl alcohol, 1% polyvinyl acetate (PVA) and 3% Polyvinylpyrolidone (PVP); Infrared light screening agent is 2% titanium dioxide, 2% ferric oxide and 3% zirconium white, adopts two-step approach to mix.At first nano silica powder and fortifying fibre are joined in the Hermetical stirring device, rotating speed 4000r/min, stir after 10 minutes, in batch mixing, add infrared light screening agent and binding agent, mix, batch mixing is poured in the mould of definite shape, dry-pressing formed, then the heat-up rate of 5 ℃/min is warming up to 500 ℃, and insulation 4h namely obtains ultralow thermal conductivity nanometer micropore lagging material.
Product thermal conductivity of the present invention is 0.038w/m.k (800 ℃ of hot side), and compressive strength (thickness direction compression 10%) is 0.8MPa, and unit weight is 300kg/m
3
Embodiment 4
A kind of preparation method of ultralow thermal conductivity nanometer micropore lagging material, its proportion of composing is: nano silica powder 90%; Fortifying fibre 3%; Infrared light screening agent 5%; Binding agent 2%.
Nano level SiO
2Powder is aerosil; Fortifying fibre is the basalt fibre of 1% sapphire whisker, 1% Zirconium oxide fibre and 1%; Infrared light screening agent is 2% titanium dioxide, 2% ferric oxide and 3% zirconium white; Binding agent is 1% polyvinyl alcohol and 1% Polyvinylpyrolidone (PVP), adopts two-step approach to mix.At first nano silica powder and fortifying fibre are joined in the Hermetical stirring device, rotating speed 4000r/min, stir after 10 minutes, in batch mixing, add infrared light screening agent and binding agent, mix, batch mixing is poured in the mould of definite shape, dry-pressing formed, then the heat-up rate of 5 ℃/min is warming up to 500 ℃, and insulation 4h namely obtains ultralow thermal conductivity nanometer micropore lagging material.
Product thermal conductivity of the present invention is 0.039w/m.k (800 ℃ of hot side), and compressive strength (thickness direction compression 10%) is 0.7MPa, and unit weight is 298kg/m
3
Embodiment 5
A kind of preparation method of ultralow thermal conductivity nanometer micropore lagging material, its proportion of composing is: nano silica powder 80%; Fortifying fibre 8%; Infrared light screening agent 7%; Binding agent 5%.
Nano level SiO
2Powder is aerosil; Fortifying fibre is 2% beta glass fibre, 2% sapphire whisker and 4% high silica fiber; Infrared light screening agent is 2% titanium dioxide, 2% ferric oxide and 3% zirconium white; Binding agent is 2% polyvinyl alcohol and 3% polyvinyl acetate (PVA), adopts two-step approach to mix.At first nano silica powder and fortifying fibre are joined in the Hermetical stirring device, rotating speed 4000r/min, stir after 10 minutes, in batch mixing, add infrared light screening agent and binding agent, mix, batch mixing is poured in the mould of definite shape, dry-pressing formed, then the heat-up rate of 5 ℃/min is warming up to 500 ℃, and insulation 4h namely obtains ultralow thermal conductivity nanometer micropore lagging material.
Product thermal conductivity of the present invention is 0.034w/m.k (800 ℃ of hot side), and compressive strength (thickness direction compression 10%) is 1.1MPa, and unit weight is 296kg/m
3
Embodiment 6
A kind of preparation method of ultralow thermal conductivity nanometer micropore lagging material, its proportion of composing is: nano silica powder 80%; Fortifying fibre 8%; Infrared light screening agent 10%; Binding agent 2%.
Nano level SiO
2Powder is aerosil; Fortifying fibre is 2% aluminum silicate fiber, 3% sapphire whisker, 3% Zirconium oxide fibre; Infrared light screening agent is 3% titanium dioxide, 3% ferric oxide and 4% zirconium white; Binding agent is 2% Polyvinylpyrolidone (PVP), adopts two-step approach to mix.At first nano silica powder and fortifying fibre are joined in the Hermetical stirring device, rotating speed 4000r/min, stir after 10 minutes, in batch mixing, add infrared light screening agent and binding agent, mix, batch mixing is poured in the mould of definite shape, dry-pressing formed, then the heat-up rate of 5 ℃/min is warming up to 500 ℃, and insulation 4h namely obtains ultralow thermal conductivity nanometer micropore lagging material.
Product thermal conductivity of the present invention is 0.035w/m.k (800 ℃ of hot side), and compressive strength (thickness direction compression 10%) is 0.96MPa, and unit weight is 292kg/m
3
Claims (7)
1. ultralow thermal conductivity nanoporous aerogel thermal insulation material is characterized in that this thermal insulation material is made for by the raw material of following weight percentage:
2. according to ultralow thermal conductivity nanoporous aerogel thermal insulation material claimed in claim 1, it is characterized in that this thermal insulation material is made for by the raw material of following weight percentage:
3. according to claim 1 or 2 described ultralow thermal conductivity nanoporous aerogel thermal insulation materials, it is characterized in that described nano level SiO
2Powder is flame silicon ash, white carbon black, aerosil or aerosil.
4. according to claim 1 or 2 described ultralow thermal conductivity nanoporous aerogel thermal insulation materials, it is characterized in that described fortifying fibre is a kind of or arbitrary combination in beta glass fibre, high silica fiber, aluminum silicate fiber, sapphire whisker, Zirconium oxide fibre and the basalt fibre.
5. according to claim 1 or 2 described ultralow thermal conductivity nanoporous aerogel thermal insulation materials, it is characterized in that described infrared light screening agent is a kind of or arbitrary combination in titanium dioxide, ferric oxide, zirconium white, silicon carbide and the chromium sesquioxide.
6. according to claim 1 or 2 described ultralow thermal conductivity nanoporous aerogel thermal insulation materials, it is characterized in that described binding agent is a kind of or arbitrary combination in polyvinyl alcohol, polyvinyl acetate (PVA) and the Polyvinylpyrolidone (PVP).
7. according to the preparation method of claim 1 or 2 described ultralow thermal conductivity nanoporous aerogel thermal insulation materials, it is characterized in that following steps:
(1), be 70 ~ 90% silicon-dioxide with weight percent with weight percent be that 0 ~ 10% fortifying fibre mixes, stir under the stirring velocity with 2000-5000r/min in the sealing stirrer, stir 5-30min, fortifying fibre is mixed in nano-powder;
(2), be that 0 ~ 30% opalizer adds in the mixing material of step (1) with weight percent, and add 0 ~ 5% binding agent, mix, obtain mixing material;
(3), above-mentioned mixing material is poured in the mould of definite shape, dry-pressing formed, then the heat-up rate of 2 ~ 6 ℃/min is warming up to 300 ~ 500 ℃, and insulation 1 ~ 4h namely obtains ultralow thermal conductivity nanometer micropore lagging material.
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| CN103964814A (en) * | 2014-04-30 | 2014-08-06 | 成都祥伟冶金材料有限公司 | Nano heat insulating material and preparation method thereof |
| CN104086116A (en) * | 2014-07-11 | 2014-10-08 | 平顶山新型耐材股份有限公司 | Nano microporous heat insulation board and preparation method thereof |
| CN104446222A (en) * | 2014-12-15 | 2015-03-25 | 山东鲁阳股份有限公司 | Ceramic fiber plate and preparation method thereof |
| CN104876512A (en) * | 2015-05-28 | 2015-09-02 | 莱州明发隔热材料有限公司 | Efficient heat-insulating material |
| CN105036733A (en) * | 2014-01-17 | 2015-11-11 | 天津城建大学 | infrared high-shielding core-shell structure opacifying agent and preparation method therefor and application thereof |
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| CN103964814A (en) * | 2014-04-30 | 2014-08-06 | 成都祥伟冶金材料有限公司 | Nano heat insulating material and preparation method thereof |
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| CN110759704A (en) * | 2019-11-27 | 2020-02-07 | 北京中环鑫汇科技有限公司 | Silicon dioxide heat insulation composite material and preparation method and application thereof |
| CN111609252A (en) * | 2020-06-04 | 2020-09-01 | 山东金石节能材料有限公司 | Low-thermal-conductivity heat insulation material and preparation method thereof |
| CN112679140A (en) * | 2020-12-18 | 2021-04-20 | 江苏山由帝奥节能新材股份有限公司 | Nano modified glass fiber composite core material and preparation method thereof |
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Application publication date: 20130313 |