CN104891934A - Aerogel thermal insulation material and preparation method thereof and refrigerator - Google Patents
Aerogel thermal insulation material and preparation method thereof and refrigerator Download PDFInfo
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- CN104891934A CN104891934A CN201510238022.6A CN201510238022A CN104891934A CN 104891934 A CN104891934 A CN 104891934A CN 201510238022 A CN201510238022 A CN 201510238022A CN 104891934 A CN104891934 A CN 104891934A
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Abstract
The invention discloses an aerogel thermal insulation material, comprising the following components in percentage by weight: 95-99.9% of silicon dioxide aerogels and 0.1-5% of carbon fiber. The invention further discloses a preparation method for the aerogel thermal insulation material and a refrigerator. The aerogel thermal insulation material disclosed by the invention is free of a foaming agent, is relatively environmental-friendly and safe, and is low in cost. In addition, the aerogel thermal insulation material has an excellent thermal insulation property, the heat conductivity coefficient of the material is 0.0206-0.0226w/(m.k), and the thermal insulation property of the refrigerator is improved, so that the energy-saving effect is achieved; the performance of the material is obviously superior to that of a conventional thermal insulation board; and the material has a huge application potential in refrigerator.
Description
Technical field
The present invention relates to lagging material technical field, particularly relate to a kind of aerogel heat-insulating material and preparation method thereof and refrigerator.
Background technology
Conventional household refrigerator is in order to reach heat insulation effect, most employing hard polyurethane foam technology foams and obtains urethane foam in the door body and casing of refrigerator, the thermal conductivity of this urethane foam is about 0.03 ~ 0.037w/ (mk), reduces the heat conduction of refrigerator and outside air mainly through increase door body and casing wall thickness.
But conventional polyurethane foams plastics adopt pneumatogen to foam mostly, as whipping agents such as fluorochlorohydrocarbon (Chlorofluorocarbons, CFCs) compound and pentamethylene.Because CFCs material can damage the ozone layer, the defect such as easily to blast after pentamethylene volatilizees in a large number and foaming technique is complicated, therefore this polyurethane material has not environmentally as refrigerator lagging material, the defect that foaming technique is comparatively complicated and cost is higher.
Summary of the invention
Main purpose of the present invention is to provide a kind of aerogel heat-insulating material, is intended to solve existing polyurethane material as refrigerator lagging material not environmentally, the technical problem that foaming technique is complicated and cost is higher.
For achieving the above object, the invention provides a kind of aerogel heat-insulating material, the component that described aerogel heat-insulating material comprises by weight percentage is as follows:
Aerosil 95% ~ 99.9%;
Carbon fiber 0.1% ~ 5%.
Preferably, the component that comprises by weight percentage of described aerogel heat-insulating material is as follows:
Aerosil 99% ~ 99.8%;
Carbon fiber 0.2% ~ 1%.
In addition, for achieving the above object, the present invention also provides a kind of preparation method of aerogel heat-insulating material, and it is as follows that the preparation method of described aerogel heat-insulating material comprises step:
Step one, prepare silicon dioxide gel;
Step 2, in described silicon dioxide gel, add carbon fiber, dispersed described carbon fiber, and obtained wet gel;
Step 3, ageing, aging, solvent exchange, surface modification and immersion treatment are carried out successively to described wet gel, obtained silica dioxide gel;
Step 4, dry described silica dioxide gel, except desolventizing, obtained described aerogel heat-insulating material;
In described step one to step 3, the proportion of element silicon quality and described carbon fiber adds according to setting proportion, to make the aerosil in described aerogel heat-insulating material and carbon fiber according to above-mentioned proportion.
Preferably, specifically to comprise step as follows for described step one:
Be 1:7:1:10 by mol ratio
-5tetraethoxy/dehydrated alcohol/water/mixed in hydrochloric acid, stirring, leave standstill formed solution;
In described solution, add dimethyl formamide and stir, then add distilled water and stir, finally add ammoniacal liquor and stir, leaving standstill and obtain described silicon dioxide gel.
Preferably, the time of described stirring is 30min, and the time of repose of described standing formation solution is 24h.
Preferably, specifically to comprise step as follows for described step 2:
Carbon fiber is added in described silicon dioxide gel, and carbon fiber described in dispersed with stirring;
The silicon dioxide gel sealing and standing being dispersed with described carbon fiber is obtained described wet gel.
Preferably, specifically to comprise step as follows for described step 3:
Wet gel described in ageing at normal temperatures and pressures;
Adding volume ratio in wet gel after aging, to be that the water/alcohol mixeding liquid of 1:4 carries out first time aging, and again adding tetraethoxy/dehydrated alcohol mixed solution that volume ratio is 1:4, to carry out second time aging, obtained Ageing solution;
In described Ageing solution, add Virahol carry out the first solvent exchange, then add normal hexane/Virahol mixed solution that volume ratio is 1:3 successively, normal hexane/Virahol mixed solution that normal hexane/Virahol mixed solution that volume ratio is 1:1, volume ratio are 3:1 and normal hexane carry out second time solvent exchange, third time solvent exchange, the 4th solvent exchange and the 5th solvent exchange, obtained displacement liquid;
In described displacement liquid, add trimethylchlorosilane/normal hexane mixed solution that volume ratio is 1:9 carry out surface modification;
Displacement liquid after surface modification is poured in normal hexane and soaks, obtained described silica dioxide gel.
Preferably, the time of described ageing is 48h, aging time described first time is 12h, the time that described second time is aging is 24h, described first time solvent exchange, second time solvent exchange, third time solvent exchange, the 4th solvent exchange and the 5th solvent exchange time be 12h, the time of described immersion is 24h.
Preferably, in described step 4, the temperature of described drying is 60 DEG C, and the time of described drying is 18h.
In addition, for achieving the above object, the present invention also provides a kind of refrigerator, and described refrigerator comprises warming plate, and described warming plate is made up of above-mentioned aerogel heat-insulating material.
Aerogel heat-insulating material of the present invention is without the need to using whipping agent, and it is environmental protection and safety more, and the urethane lagging material that its cost is prepared compared with polyurethane foam technology is low; In addition, this aerogel heat-insulating material has excellent heat-proof quality, its thermal conductivity is 0.0206 ~ 0.0226w/ (mk), improve the heat-insulating property of refrigerator, thus reach energy-conservation effect, its performance is obviously better than the performance of conventional vacuum plate, and refrigerator has huge application potential.
The realization of the object of the invention, functional characteristics and advantage will be described further in conjunction with the embodiments.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of aerogel heat-insulating material, in a preferred embodiment, the component that this aerogel heat-insulating material comprises by weight percentage is as follows:
Aerosil 95% ~ 99.9%;
Carbon fiber 0.1% ~ 5%.
The aerogel heat-insulating material of this preferred embodiment is without the need to using whipping agent, and it is environmental protection and safety more, and its cost is low; In addition, this aerogel heat-insulating material has excellent heat-proof quality, and its thermal conductivity is 0.0206 ~ 0.0226w/ (mk), improves the heat-insulating property of refrigerator, thus reaches energy-conservation effect.
In a preferred embodiment, the component that comprises by weight percentage of this aerogel heat-insulating material is as follows:
Aerosil 99% ~ 99.8%;
Carbon fiber 0.2% ~ 1%.
The tensile strength of aerogel heat-insulating material under 10% and 50% deformation of the preferred embodiment is respectively 0.220MPa and 1.260MPa, and its tensile strength is excellent; Effective thermal conductivity is 0.0226Wm
-1k
-1, its heat-proof quality is excellent.
Reference is as following table one to table three, and table one is the tensile strength of the different carbon fiber consumption of aerogel heat-insulating material of the present invention; Table two is the effective thermal conductivity of the different carbon fiber consumption of aerogel heat-insulating material of the present invention; Table three is the thermal conductivity of different refrigerator heat preservation plate material.
Table one
Table one is the tensile strength of aerogel heat-insulating material under 10% and 50% deformation, analyzes known, and aerogel heat-insulating material tensile strength after adding carbon fiber significantly improves, and along with the increase of carbon fiber content, the tensile strength of matrix material increases gradually.As can be seen from the table, the tensile strength of pure aerogel under 10% and 50% deformation is respectively 0.081MPa and 0.710MPa, and after adding 1wt% carbon fiber, the tensile strength of aerogel heat-insulating material under 10% and 50% deformation increases to 0.220MPa and 1.260MPa, be respectively 2.7 and 1.8 times of pure aerogel, therefore adding of carbon fiber aerogel enhancing had a significant effect.
Table two
Table two is aerogel heat-insulating material effective thermal conductivity at normal temperatures, and the effective thermal conductivity of pure aerogel is 0.0214Wm
-1k
-1, after adding 0.2wt% carbon fiber, the effective thermal conductivity of aerogel heat-insulating material is 0.0206Wm
-1k
-1; The effective thermal conductivity of aerogel heat-insulating material increases along with the increase of carbon fiber content, and when carbon fiber content increases to 1wt%, its effective thermal conductivity is 0.0226Wm
-1k
-1, higher than the effective thermal conductivity of pure aerogel, namely the purer aerogel of its heat-proof quality is poor, but still has superinsulation performance (namely lower than the thermal conductivity 0.0234Wm of synthermal lower air
-1k
-1).
Table three
By the refrigerator heat preservation plate material in contrast table three, can find, fibre reinforced SiO
2the thermal conductivity of aerogel heat-insulating material is far below the lagging material of conventional refrigerator, and can reach energy-conservation effect, its performance is obviously better than the performance of conventional vacuum plate, and refrigerator has huge application potential.
The present invention also provides a kind of preparation method of aerogel heat-insulating material, and in a preferred embodiment, it is as follows that the preparation method of this aerogel heat-insulating material comprises step:
Step one, prepare silicon dioxide gel;
Particularly, be 1:7:1:10 by mol ratio
-5tetraethoxy/dehydrated alcohol/water/mixed in hydrochloric acid in Erlenmeyer flask, room temperature lower magnetic force agitator stir 30min, then leave standstill 24h obtain solution;
Add dimethyl formamide/distilled water/ammoniacal liquor in the solution successively, stir 30min at every turn, leave standstill and obtain silicon dioxide gel.
Step 2, in this silicon dioxide gel, add carbon fiber, dispersed carbon fiber, and obtained wet gel;
Particularly, in this silicon dioxide gel, add carbon fiber, adopt ultrasonic stirring to make carbon fiber be distributed in this silicon dioxide gel;
Will sealing and standing in mould be poured rapidly into obtain wet gel during gel until this silicon dioxide gel.
Step 3, this wet gel is carried out ageing, aging, solvent exchange, surface modification and immersion treatment successively, obtained silica dioxide gel;
Particularly, this wet gel of ageing 48h under normal pressure and temperature;
Then, add water/alcohol mixeding liquid first time aging 12h that water volume fraction is 20%, and add tetraethoxy/aging 24h of alcohol mixeding liquid second time that tetraethoxy volume fraction is 20%, obtained Ageing solution;
In this Ageing solution, add Virahol carry out first time solvent exchange 12h, then add successively normal hexane volume fraction be 25% normal hexane/Virahol mixed solution, normal hexane volume fraction be 50% normal hexane/Virahol mixed solution, normal hexane volume fraction be 75% normal hexane/Virahol mixed solution and hexane solution carry out second time solvent exchange, third time solvent exchange, the 4th solvent exchange and the 5th solvent exchange, each time swap is 12h, obtained displacement liquid;
Add in this displacement liquid trimethylchlorosilane volume fraction be 10% trimethylchlorosilane/normal hexane mixed solution carry out surface modification, to improve the consistency of carbon fiber;
Then the displacement liquid of surface modification is poured in normal hexane and soak 24h, obtained silica dioxide gel.
Step 4, this silica dioxide gel dry, except desolventizing, obtained aerogel heat-insulating material as above;
Particularly, this silica dioxide gel is placed in 60 DEG C of dry 18h of loft drier, fibre reinforced SiO can be obtained
2aerogel heat-insulating material.
Wherein, in above-mentioned steps one to step 3, the proportion of element silicon quality and described carbon fiber adds according to setting proportion, to make aerosil in aerogel heat-insulating material and carbon fiber proportion as described above.
The preparation method of this preferred embodiment adopts sol-gel and constant pressure and dry operation, and preparation condition is simple, and preparation process can not produce flammable explosive gas, and can not damage environment, Environmental Safety.
The present invention also provides a kind of refrigerator, and in a preferred embodiment, this refrigerator comprises warming plate, and this warming plate is made up of aerogel heat-insulating material as above.
The aerogel heat-insulating material of the warming plate employing of this refrigerator, without the need to using whipping agent, the door body of this refrigerator and casing be environmental protection and safety more, and compare the refrigerator adopting polyurethane foam material, and its cost is lower; In addition, because this aerogel heat-insulating material has excellent heat-proof quality, its thermal conductivity is 0.0206 ~ 0.0226w/ (mk), improves the heat-insulating property of refrigerator, thus reaches energy-conservation effect.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an aerogel heat-insulating material, is characterized in that, the component that described aerogel heat-insulating material comprises by weight percentage is as follows:
Aerosil 95% ~ 99.9%;
Carbon fiber 0.1% ~ 5%.
2. aerogel heat-insulating material as claimed in claim 1, it is characterized in that, the component that described aerogel heat-insulating material comprises by weight percentage is as follows:
Aerosil 99% ~ 99.8%;
Carbon fiber 0.2% ~ 1%.
3. a preparation method for aerogel heat-insulating material, is characterized in that, it is as follows that the preparation method of described aerogel heat-insulating material comprises step:
Step one, prepare silicon dioxide gel;
Step 2, in described silicon dioxide gel, add carbon fiber, dispersed described carbon fiber, and obtained wet gel;
Step 3, ageing, aging, solvent exchange, surface modification and immersion treatment are carried out successively to described wet gel, obtained silica dioxide gel;
Step 4, dry described silica dioxide gel, except desolventizing, obtained described aerogel heat-insulating material;
In described step one to step 3, the proportion of element silicon quality and described carbon fiber adds according to setting proportion, to make aerosil in described aerogel heat-insulating material and carbon fiber according to the proportion in claim 1 or 2.
4. the preparation method of aerogel heat-insulating material as claimed in claim 3, it is characterized in that, it is as follows that described step one specifically comprises step:
Be 1:7:1:10 by mol ratio
-5tetraethoxy/dehydrated alcohol/water/mixed in hydrochloric acid, stirring, leave standstill formed solution;
In described solution, add dimethyl formamide and stir, then add distilled water and stir, finally add ammoniacal liquor and stir, leaving standstill and obtain described silicon dioxide gel.
5. the preparation method of aerogel heat-insulating material as claimed in claim 4, it is characterized in that, the time of described stirring is 30min, and the time of repose of described standing formation solution is 24h.
6. the preparation method of aerogel heat-insulating material as claimed in claim 3, it is characterized in that, it is as follows that described step 2 specifically comprises step:
Carbon fiber is added in described silicon dioxide gel, and carbon fiber described in dispersed with stirring;
The silicon dioxide gel sealing and standing being dispersed with described carbon fiber is obtained described wet gel.
7. the preparation method of aerogel heat-insulating material as claimed in claim 3, it is characterized in that, it is as follows that described step 3 specifically comprises step:
Wet gel described in ageing at normal temperatures and pressures;
Adding volume ratio in wet gel after aging, to be that the water/alcohol mixeding liquid of 1:4 carries out first time aging, and again adding tetraethoxy/dehydrated alcohol mixed solution that volume ratio is 1:4, to carry out second time aging, obtained Ageing solution;
In described Ageing solution, add Virahol carry out the first solvent exchange, then add normal hexane/Virahol mixed solution that volume ratio is 1:3 successively, normal hexane/Virahol mixed solution that normal hexane/Virahol mixed solution that volume ratio is 1:1, volume ratio are 3:1 and normal hexane carry out second time solvent exchange, third time solvent exchange, the 4th solvent exchange and the 5th solvent exchange, obtained displacement liquid;
In described displacement liquid, add trimethylchlorosilane/normal hexane mixed solution that volume ratio is 1:9 carry out surface modification;
Displacement liquid after surface modification is poured in normal hexane and soaks, obtained described silica dioxide gel.
8. the preparation method of aerogel heat-insulating material as claimed in claim 7, it is characterized in that, the time of described ageing is 48h, aging time described first time is 12h, the time that described second time is aging is 24h, described first time solvent exchange, second time solvent exchange, third time solvent exchange, the 4th solvent exchange and the 5th solvent exchange time be 12h, the time of described immersion is 24h.
9. the preparation method of aerogel heat-insulating material as claimed in claim 3, it is characterized in that, in described step 4, the temperature of described drying is 60 DEG C, and the time of described drying is 18h.
10. a refrigerator, comprises warming plate, it is characterized in that, described warming plate is made up of the aerogel heat-insulating material described in claim 1 or 2.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105771887A (en) * | 2016-03-12 | 2016-07-20 | 常州大学 | Preparation method for silicon-dioxide-based carbon fiber composite adsorbent |
| CN107140938A (en) * | 2017-04-25 | 2017-09-08 | 郑善 | A kind of anti-shedding aeroge complex heat-preservation felt and preparation method thereof |
| CN107572539A (en) * | 2017-09-19 | 2018-01-12 | 常州朋悦纺织品有限公司 | A kind of preparation method of plural gel heat-barrier material |
| CN108640642A (en) * | 2018-05-31 | 2018-10-12 | 佛山市高明区爪和新材料科技有限公司 | A kind of preparation method of aerogel type porous heat insulation material |
| CN109537763A (en) * | 2018-11-15 | 2019-03-29 | 北京建工新型建材科技股份有限公司 | Prefabricated aeroge composite thermal-insulating wall and preparation method thereof |
| CN109796220A (en) * | 2019-03-12 | 2019-05-24 | 江苏群鑫粉体科技股份有限公司 | Calcium carbonate-calcium silicates-aerosil multilayer heat insulating composite material and preparation method thereof |
| CN110511460A (en) * | 2019-08-22 | 2019-11-29 | 唐雪金 | A kind of high temperature resistant silicon dioxide aerogel heat-insulating material |
| WO2020134973A1 (en) * | 2018-12-27 | 2020-07-02 | 青岛海尔电冰箱有限公司 | Thermal insulating material and refrigerator |
| CN111393851A (en) * | 2020-03-20 | 2020-07-10 | 上海大音希声新型材料有限公司 | Aerogel heat-insulation composite material and preparation method thereof |
| CN111943636A (en) * | 2020-08-27 | 2020-11-17 | 东莞市鸿亿导热材料有限公司 | Thermal insulation material for electronic cigarette and preparation method thereof |
| CN113583289A (en) * | 2021-08-16 | 2021-11-02 | 天津泓锦程生物科技有限公司 | Plant polysaccharide heat-preservation and heat-insulation aerogel material and preparation method thereof |
| CN114133210A (en) * | 2021-12-23 | 2022-03-04 | 青岛仟亿新材料科技有限公司 | Aerogel heat insulation material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105771887A (en) * | 2016-03-12 | 2016-07-20 | 常州大学 | Preparation method for silicon-dioxide-based carbon fiber composite adsorbent |
| CN107140938A (en) * | 2017-04-25 | 2017-09-08 | 郑善 | A kind of anti-shedding aeroge complex heat-preservation felt and preparation method thereof |
| CN107572539A (en) * | 2017-09-19 | 2018-01-12 | 常州朋悦纺织品有限公司 | A kind of preparation method of plural gel heat-barrier material |
| CN108640642B (en) * | 2018-05-31 | 2021-07-23 | 佛山市高明区爪和新材料科技有限公司 | Preparation method of aerogel type porous heat-insulating material |
| CN108640642A (en) * | 2018-05-31 | 2018-10-12 | 佛山市高明区爪和新材料科技有限公司 | A kind of preparation method of aerogel type porous heat insulation material |
| CN109537763A (en) * | 2018-11-15 | 2019-03-29 | 北京建工新型建材科技股份有限公司 | Prefabricated aeroge composite thermal-insulating wall and preparation method thereof |
| WO2020134973A1 (en) * | 2018-12-27 | 2020-07-02 | 青岛海尔电冰箱有限公司 | Thermal insulating material and refrigerator |
| CN109796220A (en) * | 2019-03-12 | 2019-05-24 | 江苏群鑫粉体科技股份有限公司 | Calcium carbonate-calcium silicates-aerosil multilayer heat insulating composite material and preparation method thereof |
| CN110511460A (en) * | 2019-08-22 | 2019-11-29 | 唐雪金 | A kind of high temperature resistant silicon dioxide aerogel heat-insulating material |
| CN110511460B (en) * | 2019-08-22 | 2021-07-13 | 江苏大毛牛新材料有限公司 | High-temperature-resistant silicon dioxide aerogel thermal insulation material |
| CN111393851A (en) * | 2020-03-20 | 2020-07-10 | 上海大音希声新型材料有限公司 | Aerogel heat-insulation composite material and preparation method thereof |
| CN111943636A (en) * | 2020-08-27 | 2020-11-17 | 东莞市鸿亿导热材料有限公司 | Thermal insulation material for electronic cigarette and preparation method thereof |
| CN113583289A (en) * | 2021-08-16 | 2021-11-02 | 天津泓锦程生物科技有限公司 | Plant polysaccharide heat-preservation and heat-insulation aerogel material and preparation method thereof |
| CN114133210A (en) * | 2021-12-23 | 2022-03-04 | 青岛仟亿新材料科技有限公司 | Aerogel heat insulation material and preparation method thereof |
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