CN102559149A - Expanding and high heat dissipation material and preparing method thereof - Google Patents
Expanding and high heat dissipation material and preparing method thereof Download PDFInfo
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- CN102559149A CN102559149A CN201010618508XA CN201010618508A CN102559149A CN 102559149 A CN102559149 A CN 102559149A CN 201010618508X A CN201010618508X A CN 201010618508XA CN 201010618508 A CN201010618508 A CN 201010618508A CN 102559149 A CN102559149 A CN 102559149A
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Abstract
The invention provides an expanding high heat dissipation material and a preparing method thereof, and belongs to the technical field of heat dissipation. The heat dissipation material consists of gels and a high heat conduction membrane distributed in the gels, wherein the gels are liquogels, aerogels and carbon aerogels, the high heat conduction membrane is a graphite membrane or a graphene membrane with a width ranging from 0.001-10 millimeters and a length ranging from 0.1-300 millimeters, the high heat conduction membrane is, by mass, 0.1% to 0.3% of the total heat dissipation material. According to the expanding high heat dissipation material and the preparing method thereof, the expanding high heat dissipation material is obtained by applying the high heat conduction materials to gel products, therefore a novel and light high heat dissipation material is achieved.
Description
Technical field
The present invention relates to the heat sink material field.
Background technology
Numerous areas such as electronic product, machinery, electric power, communication, chemical industry in the process of the processing of product, production, and in the process of using, all can produce the heat of different amts.If the heat that produces can not effectively be distributed, processing and use to product all might impact.
Colloidal particle in colloidal sol or the solution or polymer are interconnection under certain condition, form the space reticulated structure, have been full of the liquid as dispersion medium in the structure space, also can be gas in xerogel, and a kind of so special dispersion system is called gel.Dispersion medium is claimed lyogel during for liquid, and dispersion medium is claimed gas gel during for gas, for gas gel, owing to be the low-down gas of thermal conductivity in its netted space, so be considered to super insulating material.If can in the reticulated structure of the space of gel, fill highly heat-conductive material, will be a kind of well behaved thermally conductive material.
In the present invention, can be applied to mould material with high heat dispersion.Wherein, utilize the height heat radiation graphite film of carbon component made, have very high heat-sinking capability, can reach 1500～1750W/mK.
And, then having more powerful heat-sinking capability at present as the grapheme material of research focus, its thermal conductivity is about 5000W/mK.
Summary of the invention
The purpose of this invention is to provide high heat sink material of a kind of puffing and preparation method thereof.Utilize the present invention,, prepare a kind of high heat sink material of puffing through highly heat-conductive material is applied in the gel product.
The high heat sink material of puffing of the present invention is made up of gel and the height heat radiation diaphragm that is dispersed in the gel.
Preferably, described gel be gas gel, lyogel one of them; Wherein gas gel be silica aerogel, oxide silica aerogel, organic aerogel, charcoal-aero gel one of them.
Preferably, described high heat radiation diaphragm is graphite film and Graphene diaphragm one of which at least; High heat radiation diaphragm-operated width range is 0.001-10mm, and high heat radiation diaphragm-operated length range is 0.1-300mm.
Preferably, in the high heat sink material of puffing, the mass ratio that high heat radiation diaphragm accounts for total heat sink material is 0.1%-30%.
Preferably, according to the difference of gel type in the high heat sink material, the preparation method of the high heat sink material of puffing has following several kinds of different modes:
Method 1, the preparation method of the high heat sink material of lyogel puffing may further comprise the steps:
Step 1 is mixed precursor under liquid phase, form sol system;
Step 2 is scattered in the height diaphragm that dispels the heat in the sol system;
Step 3, colloidal sol forms gel, is converted into the high heat sink material of puffing.
Preferably, described precursor is one of them a compound of metal alkoxide, organic acid salt, inorganic salt.
Preferably, in step 2, add one of them dispersion agent of SEPIGEL 305, ROHM, silicate.
Method 2, the preparation method of the high heat sink material of gas gel puffing.
In method 1, prepare on the basis of the high heat sink material of lyogel puffing; Further the high heat sink material of lyogel puffing with preparation carries out drying treatment; The fluent meterial that is dispersed in the lyogel is evaporated, thereby form the high heat sink material of puffing of gas gel.
Preferably, the drying means of the high heat sink material of lyogel puffing adopts, one of them method of freeze-drying, solvent exchange desiccating method, supercritical fluid drying.
Method 3, the preparation method of the high heat sink material of charcoal-aero gel puffing may further comprise the steps,
Step 1 is mixed organic precursors under liquid phase;
Step 2 is scattered in the height diaphragm that dispels the heat in the aforementioned solution, and adds alkaline catalysts;
Polycondensation takes place and forms wet gel under the alkaline catalysts effect in step 3, organic precursors, and wet gel is carried out drying, forms organic aerogel;
Step 4 with the organic aerogel charing, forms the high heat sink material of puffing of charcoal-aero gel.
Preferably; Described organic precursors is Resorcinol and formaldehyde, trimeric cyanamide and formaldehyde, resol and furfural, linear polymeric N hydroxymethyl acrylamide and Resorcinol, mixture cresol and formaldehyde, meta-cresol and formaldehyde, 2, one of them compsn of 4-resorcylic acid and formaldehyde.
Preferably, with the organic aerogel charing, under inert atmosphere or under the vacuum condition, carry out in the said step 5.
Description of drawings
Fig. 1 is the synoptic diagram of the high heat sink material of puffing shown in the embodiment of the invention.
Fig. 2 is the high heat sink material preparing method's one of a puffing of the present invention schema.
Fig. 3 is the high heat sink material preparing method's two of a puffing of the present invention schema.
Fig. 4 is the high heat sink material preparing method's three of a puffing of the present invention schema.
Embodiment
In the present invention, high heat sink material of a kind of puffing and corresponding preparation method thereof are provided.Below in conjunction with shown in Figure 1, at first the high heat sink material of product puffing of preparation is described in detail.
As shown in Figure 1, displaying be the synoptic diagram of the high heat sink material of a kind of puffing, the high heat sink material 100 of puffing is made up of gel 110 and the height heat radiation diaphragm 120 that is dispersed in the gel.
Described gel 110; Be meant that colloidal particle or polymer in colloidal sol or the solution are interconnection under certain condition; Form the space reticulated structure; When the dispersion medium that is full of in the structure space is a lyogel during for liquid, then gas gel when the dispersion medium that is full of in the structure space is gas, if carry out further charing again by organic aerogel then form charcoal-aero gel.Gel 110 described in the present invention is one of them a gelatinous material of lyogel, gas gel, charcoal-aero gel.
Lyogel mainly contains hydrogel and alcogel according to the difference of disperse phase medium, and the disperse phase medium of hydrogel is a water, is formed through crosslinked back by water-soluble molecules, and the disperse phase medium of alcogel is an alcohols, is formed through crosslinked back by hydrophobic molecule.
Gas gel is a kind of solid matter form, and density is very little, also is called as " solid-state cigarette " or " cigarette that freezes " sometimes.The preparation method of gas gel adopts sol-gel method to prepare wet gel, and wet gel obtains corresponding gas gel through solvent exchange and overcritical work.
Gas gel mainly contains silica aerogel, oxide silica aerogel, organic aerogel etc. at present; For oxide silica aerogel common silica aerogel, alumina aerogels, titania aerogel or the like arranged, for organic aerogel common furfural phenolic aldehyde base organic aerogel, Resorcinol-formaldehyde organic aerogel, polyisocyanate-based organic aerogel or the like arranged.
Then form charcoal-aero gel by the further charing of organic aerogel.Charcoal-aero gel is unique gas gel with electroconductibility, and application prospect is boundless.
Described high heat radiation diaphragm 120 is graphite film and Graphene diaphragm one of which at least; High heat radiation diaphragm-operated width range is 0.001-10mm, and high heat radiation diaphragm-operated length range is 0.1-300mm.In the high heat sink material of puffing, the mass ratio that high heat radiation diaphragm accounts for total heat sink material is 0.1%-30%.
Utilize the height heat radiation graphite film of carbon component made, have very high heat-sinking capability, can reach 1500～1750W/mK.And, then having more powerful heat-sinking capability at present as the grapheme material of research focus, its thermal conductivity is about 5000W/mK.The present invention with graphite film or Graphene diaphragm as heat-eliminating medium, with its blending in gelatinous material, thereby make the puffing material of high heat radiation.
Gel type has lyogel, gas gel, charcoal-aero gel several types in the high heat sink material of puffing, and according to the difference of gel type, the preparation method of the high heat sink material of puffing has following several kinds of different modes:
As shown in Figure 2, displaying be gel type corresponding preparation method when being lyogel, in conjunction with the description of front, describe in detail in the face of the preparation method down about product.
Step 1 is mixed precursor under liquid phase, form sol system.
Described precursor is meant the compound that contains high chemically reactive component; Like metal alkoxide, organic acid salt, inorganic salt etc., after these precursors mix, hydrolysis, condensation reaction can take place under liquid phase; Form sol system; This system has fluid characteristics, and divided particles is solid or macromole, and the divided particles size is between 1～1000nm.
Step 2 is scattered in the height diaphragm that dispels the heat in the sol system.
Described high heat radiation diaphragm is a graphite film and Graphene diaphragm one of which at least; The high heat dissipation film chip size scope that is scattered in the sol system is: width 0.001-10mm, length 0.1-300mm; The ratio of high heat radiation diaphragm in sol system decided according to the heat dispersion that the heat sink material for preparing will reach, and generally speaking, the mass ratio that high heat radiation diaphragm accounts for total heat sink material is 0.1%-30%.
Step 3, colloidal sol forms gel, is converted into the high heat sink material of puffing.
Polymerization takes place in colloidal sol through between the ageing micelle, form gelling system, and this system has solid features; Dispersed material forms the successive mesh skeleton; Be full of the liquid that loses flowability in the skeleton space, the blending of high heat radiation diaphragm forms the high heat sink material of puffing of lyogel in the lyogel system.
As shown in Figure 3, displaying be gel type corresponding preparation method when being gas gel.
Gas gel is on the basis of preparation lyogel, will be dispersed in the liquid evaporation in the space by lyogel through super-dry, when being gas in the skeleton space, is gas gel.
Therefore the high heat sink material of gas gel puffing prepares on the basis of the high heat sink material of lyogel puffing, has increased the 4th step again:
Step 4 is carried out drying with wet gel, forms the high heat sink material of puffing of gas gel.
Described drying means adopts, one of them method of freeze-drying, solvent exchange desiccating method, supercritical fluid drying.
As shown in Figure 4, displaying be the preparation method of the high heat sink material of charcoal-aero gel puffing, describe in detail down in the face of this preparation method.
Step 1 is mixed organic precursors under liquid phase.
Because charcoal-aero gel is on the basis of gas gel; Further charing forms; The polymkeric substance of its mesh skeleton should be organic polymer, therefore in the step of beginning, needs to adopt organic precursors, for instance; Like Resorcinol and formaldehyde, trimeric cyanamide and formaldehyde, resol and furfural, linear polymeric N hydroxymethyl acrylamide and Resorcinol, mixture cresol one formaldehyde, meta-cresol-formaldehyde, 2,4-resorcylic acid-formaldehyde etc.
Step 2 is scattered in the height diaphragm that dispels the heat in the aforementioned solution, and adds alkaline catalysts.
Polycondensation under the effect of alkaline catalysts, just can take place in the precursor that adds in the abovementioned steps.Described alkaline catalysts is yellow soda ash, salt of wormwood etc.
Polycondensation takes place and forms wet gel in step 3, organic precursors under the alkaline catalysts effect, wet gel is carried out drying, forms organic aerogel.
At present, the drying mode of organic aerogel mainly contains three kinds: supercritical drying, lyophilize, solvent exchange drying.Supercritical drying generally with carbonic acid gas as medium; Lyophilize is that the dispersion liq in the gel is frozen into solid, makes solvent distillation wherein then; The solvent exchange drying is through the liquid component in the volatile liquid displacement gel, and then carries out drying.
Step 4 with the organic aerogel charing, forms the high heat sink material of puffing of charcoal-aero gel.
The carbonization process of organic aerogel carries out under inert atmosphere or under the vacuum condition, and the structure of the charcoal-aero gel of formation and performance receive the influence of different factors, and the temperature rise rate during as 700～900 ℃, carbonization temperature, carbonization time etc. are all influential.
More than be the description of this invention and non-limiting, based on other embodiment of inventive concept, all among protection scope of the present invention.
Claims (14)
1. high heat sink material of puffing is characterized in that: this heat sink material is made up of gel and the height heat radiation diaphragm that is dispersed in the gel.
2. the high heat sink material of a kind of puffing according to claim 1 is characterized in that: described gel be gas gel, lyogel one of them.
3. the high heat sink material of a kind of puffing according to claim 2 is characterized in that: described gas gel be silica aerogel, oxide silica aerogel, organic aerogel, charcoal-aero gel one of them.
4. the high heat sink material of a kind of puffing according to claim 1 is characterized in that: described high heat radiation diaphragm is graphite film and Graphene diaphragm one of which at least.
5. the high heat sink material of a kind of puffing according to claim 1 is characterized in that: described high heat radiation diaphragm-operated width range is 0.001-10mm, and high heat radiation diaphragm-operated length range is 0.1-300mm.
6. the high heat sink material of a kind of puffing according to claim 1 is characterized in that: in the high heat sink material of described puffing, the mass ratio that high heat radiation diaphragm accounts for total heat sink material is 0.1%-30%.
7. the preparation method of the high heat sink material of puffing, it is characterized in that: this method may further comprise the steps,
Step 1 is mixed precursor under liquid phase, form sol system;
Step 2 is scattered in the height diaphragm that dispels the heat in the sol system;
Step 3, colloidal sol forms gel, is converted into the high heat sink material of puffing.
8. the preparation method of the high heat sink material of puffing, it is characterized in that: this method may further comprise the steps,
Step 1 is mixed precursor under liquid phase, form sol system;
Step 2 is scattered in the height diaphragm that dispels the heat in the sol system;
Step 3, colloidal sol changes wet gel into;
Step 4 is carried out drying with wet gel, forms the high heat sink material of puffing of gas gel.
9. according to the preparation method of claim 7 or the high heat sink material of 8 described a kind of puffings, it is characterized in that: described precursor is one of them a compound of metal alkoxide, organic acid salt, inorganic salt.
10. according to the preparation method of claim 7 or the high heat sink material of 8 described a kind of puffings, it is characterized in that: in step 2, add one of them dispersion agent of SEPIGEL 305, ROHM, silicate.
11. the preparation method of the high heat sink material of a kind of puffing according to claim 8 is characterized in that: the wet gel drying means adopts in the step 4, one of them method of freeze-drying, solvent exchange desiccating method, supercritical fluid drying.
12. the preparation method of the high heat sink material of puffing is characterized in that: this method may further comprise the steps,
Step 1 is mixed organic precursors under liquid phase;
Step 2 is scattered in the height diaphragm that dispels the heat in the aforementioned solution, and adds alkaline catalysts;
Polycondensation takes place and forms wet gel under the alkaline catalysts effect in step 3, organic precursors, and wet gel is carried out drying, forms organic aerogel;
Step 4 with the organic aerogel charing, forms the high heat sink material of puffing of charcoal-aero gel.
13. the preparation method of the high heat sink material of a kind of puffing according to claim 12; It is characterized in that: described organic precursors is Resorcinol and formaldehyde, trimeric cyanamide and formaldehyde, resol and furfural, mixture cresol and formaldehyde, meta-cresol and formaldehyde, 2, one of them compsn of 4-resorcylic acid and formaldehyde.
14. the preparation method of the high heat sink material of a kind of puffing according to claim 12 is characterized in that: with the organic aerogel charing, be to carry out charing under inert atmosphere or under the vacuum condition in the said step 5.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103108531A (en) * | 2012-11-28 | 2013-05-15 | 博昱科技（丹阳）有限公司 | Three-dimensional net-shaped high thermal conductivity graphite framework structure and manufacture method thereof |
| CN105505334A (en) * | 2015-12-25 | 2016-04-20 | 松亿实业（厦门）有限公司 | Graphene radiator as well as preparation method and application thereof |
| CN106000302A (en) * | 2016-05-28 | 2016-10-12 | 湖南细心信息科技有限公司 | Preparation method of composite carbon aerogel-baed air purifying agent |
| CN106565267A (en) * | 2016-11-01 | 2017-04-19 | 天津晨祥丰凯新材料科技有限公司 | Preparation method for carbon aerogel composite material |
| CN107195435A (en) * | 2017-06-07 | 2017-09-22 | 合肥励仙电力工程有限公司 | It is a kind of for heat sink material of transformer and preparation method thereof |
| CN109228549A (en) * | 2018-08-03 | 2019-01-18 | 南京林业大学 | A kind of preparation method of high heat conducting nano cellulose base electric insulation membrane material |
| CN109705816A (en) * | 2019-02-18 | 2019-05-03 | 西南交通大学 | Multifunction flexible phase-change material, preparation method and construction material |
| CN113372882A (en) * | 2021-06-07 | 2021-09-10 | 山东国烯新材料创新中心有限公司 | Boron nitride-based unidirectional insulation composite phase-change material and preparation method thereof |
| CN115340630A (en) * | 2022-09-02 | 2022-11-15 | 东莞市中森新材料有限公司 | Gel with good heat dissipation effect and rapid cooling and manufacturing process |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108531A (en) * | 2012-11-28 | 2013-05-15 | 博昱科技（丹阳）有限公司 | Three-dimensional net-shaped high thermal conductivity graphite framework structure and manufacture method thereof |
| CN103108531B (en) * | 2012-11-28 | 2015-03-18 | 镇江博昊科技有限公司 | Three-dimensional net-shaped high thermal conductivity graphite framework structure and manufacture method thereof |
| CN105505334A (en) * | 2015-12-25 | 2016-04-20 | 松亿实业（厦门）有限公司 | Graphene radiator as well as preparation method and application thereof |
| CN105505334B (en) * | 2015-12-25 | 2019-03-29 | 松亿实业（厦门）有限公司 | A kind of graphene radiator, preparation method and applications |
| CN106000302A (en) * | 2016-05-28 | 2016-10-12 | 湖南细心信息科技有限公司 | Preparation method of composite carbon aerogel-baed air purifying agent |
| CN106565267A (en) * | 2016-11-01 | 2017-04-19 | 天津晨祥丰凯新材料科技有限公司 | Preparation method for carbon aerogel composite material |
| CN107195435A (en) * | 2017-06-07 | 2017-09-22 | 合肥励仙电力工程有限公司 | It is a kind of for heat sink material of transformer and preparation method thereof |
| CN109228549A (en) * | 2018-08-03 | 2019-01-18 | 南京林业大学 | A kind of preparation method of high heat conducting nano cellulose base electric insulation membrane material |
| CN109705816A (en) * | 2019-02-18 | 2019-05-03 | 西南交通大学 | Multifunction flexible phase-change material, preparation method and construction material |
| CN113372882A (en) * | 2021-06-07 | 2021-09-10 | 山东国烯新材料创新中心有限公司 | Boron nitride-based unidirectional insulation composite phase-change material and preparation method thereof |
| CN115340630A (en) * | 2022-09-02 | 2022-11-15 | 东莞市中森新材料有限公司 | Gel with good heat dissipation effect and rapid cooling and manufacturing process |
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