WO2016121798A1 - エアロゲル積層体の製造方法及びエアロゲル積層ロール - Google Patents
エアロゲル積層体の製造方法及びエアロゲル積層ロール Download PDFInfo
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- WO2016121798A1 WO2016121798A1 PCT/JP2016/052284 JP2016052284W WO2016121798A1 WO 2016121798 A1 WO2016121798 A1 WO 2016121798A1 JP 2016052284 W JP2016052284 W JP 2016052284W WO 2016121798 A1 WO2016121798 A1 WO 2016121798A1
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- airgel
- layer
- group
- roll
- wet gel
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Definitions
- the present invention relates to a method for producing an airgel laminate and an airgel laminate roll.
- Patent Document 1 proposes a plate-like foam containing at least one metal thin film on the surface and / or inside of a polypropylene resin foam. ing.
- airgel is known as a material having low thermal conductivity and heat insulation.
- Patent Document 2 describes that a solvent-containing gel sheet is produced in a continuous manner.
- the gel sheet described in Patent Document 2 is produced by impregnating a core material. Since airgel is difficult to handle, it is difficult to reduce the thickness by forming an airgel layer on a support, and there is a problem in productivity.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an airgel laminate manufacturing method and an airgel laminate roll that are excellent in productivity and capable of reducing the thickness of an airgel layer.
- the present invention relates to a method for producing an airgel laminate having a support and an airgel layer having a thickness of 200 ⁇ m or less provided on the support, the support and a wet gel provided on the support
- a method for producing an airgel laminate comprising a step of washing a wet gel laminate having a layer by a roll-to-roll method.
- the thickness of the wet gel layer is preferably 400 ⁇ m or less.
- the wet gel may contain a gel produced from a sol containing at least one selected from the group consisting of a polysiloxane compound having a reactive group in the molecule and a hydrolysis product of the polysiloxane compound.
- a gel produced from a sol containing silica particles may be contained.
- the present invention provides an airgel laminating roll in which an airgel laminate having a support and an airgel layer having a thickness of 200 ⁇ m or less provided on the support is wound around a core.
- the airgel layer may be a layer containing an airgel having a structure derived from polysiloxane.
- the airgel layer is obtained by drying a wet gel generated from a sol containing at least one selected from the group consisting of a polysiloxane compound having a reactive group in the molecule and a hydrolysis product of the polysiloxane compound. It may be a layer or a layer formed by drying a wet gel produced from a sol containing silica particles.
- the present invention it is possible to provide a method for producing an airgel laminate that is excellent in productivity and that can reduce the thickness of an airgel layer. Moreover, according to this invention, the airgel lamination roll by which the thinned airgel layer was laminated
- the airgel laminated roll of this embodiment includes a cylindrical winding core and an airgel laminated body having a thickness of 200 ⁇ m or less wound around the winding core in a roll shape.
- the airgel laminate according to this embodiment has a structure in which an airgel layer having a thickness of 200 ⁇ m or less is laminated on a support. Since the airgel layer is excellent in flexibility and can be formed into a sheet of airgel that has been difficult to handle in the past and can be integrated with a support, the airgel laminate 10 is formed on a cylindrical core. It can be wound and handled.
- FIG. 1 is a diagram schematically showing a cross section of an airgel laminate 10 of the present embodiment.
- the airgel laminate has a structure in which an airgel layer 1 is laminated on a support 2.
- the airgel layer according to the present embodiment is composed of airgel.
- dry gel obtained by using supercritical drying method for wet gel is aerogel
- dry gel obtained by drying under atmospheric pressure is xerogel
- dry gel obtained by freeze-drying is cryogel
- the obtained low-density dried gel is referred to as an aerogel regardless of the drying method of the wet gel.
- the airgel means “a gel composed of a microporous solid whose dispersed phase is a gas”, which is an aerogel in a broad sense, that is, “Gel compressed of a microporous solid in which the dispersed phase is a gas”. To do.
- the inside of the airgel has a network-like fine structure, and has a cluster structure in which airgel particles of about 2 to 20 nm are combined. Between the skeletons formed by the clusters, there are pores less than 100 nm, and a three-dimensionally fine porous structure is formed.
- the airgel in this embodiment is a silica airgel which has a silica as a main component. Examples of the silica airgel include so-called organic-inorganic hybrid silica airgel into which an organic group such as a methyl group or an organic chain is introduced.
- the airgel layer may be a layer containing an airgel having a structure derived from polysiloxane.
- Examples of the airgel according to the present embodiment include the following modes. By adopting these embodiments, it becomes easy to obtain an airgel that is excellent in heat insulation and flexibility and can be thinned. However, adopting each of these aspects is not necessarily the purpose of obtaining the airgel defined in the present embodiment. By adopting each aspect, an airgel having heat insulation and flexibility according to each aspect and capable of being thinned can be obtained.
- the airgel according to the present embodiment can have a structure represented by the following general formula (1).
- R 1 and R 2 each independently represent an alkyl group or an aryl group
- R 3 and R 4 each independently represent an alkylene group
- examples of the aryl group include a phenyl group and a substituted phenyl group.
- the substituent of the substituted phenyl group include an alkyl group, a vinyl group, a mercapto group, an amino group, a nitro group, and a cyano group.
- R 1 and R 2 may each independently be an alkyl group having 1 to 6 carbon atoms or a phenyl group.
- the alkyl group may be a methyl group.
- R 3 and R 4 may each independently be an alkylene group having 1 to 6 carbon atoms.
- the alkylene group may be an ethylene group or a propylene group.
- the airgel according to the present embodiment may be an airgel having a ladder type structure including a support portion and a bridge portion, and the bridge portion may be an airgel having a structure represented by the following general formula (2). .
- the “ladder structure” has two struts and bridges connecting the struts (having a so-called “ladder” form). It is.
- the airgel skeleton may have a ladder structure, but the airgel may partially have a ladder structure.
- R 6 and R 7 each independently represents an alkyl group or an aryl group, and b represents an integer of 1 to 50.
- examples of the aryl group include a phenyl group and a substituted phenyl group.
- examples of the substituent of the substituted phenyl group include an alkyl group, a vinyl group, a mercapto group, an amino group, a nitro group, and a cyano group.
- b is an integer of 2 or more
- two or more R 6 s may be the same or different, and similarly two or more R 7 s are each the same. May be different.
- the airgel has a structure derived from a conventional ladder-type silsesquioxane (that is, has a structure represented by the following general formula (X)). It becomes the airgel which has the outstanding softness
- the structure of the bridge portion is —O—, but the airgel according to the present embodiment.
- the structure of a bridge part is a structure (polysiloxane structure) represented by the said General formula (2).
- R represents a hydroxy group, an alkyl group or an aryl group.
- the ladder structure may be represented by the following general formula (3 ) May be used.
- R 5 , R 6 , R 7 and R 8 each independently represents an alkyl group or an aryl group
- a and c each independently represents an integer of 1 to 3000
- b is 1 to 50 Indicates an integer.
- examples of the aryl group include a phenyl group and a substituted phenyl group.
- the substituent of the substituted phenyl group include an alkyl group, a vinyl group, a mercapto group, an amino group, a nitro group, and a cyano group.
- b is an integer of 2 or more
- two or more R 6 s may be the same or different
- similarly two or more R 7 s are each the same. May be different.
- when a is an integer of 2 or more
- two or more R 5 s may be the same or different.
- c is an integer of 2 or more
- 2 or more R 8 may be the same or different.
- R 5 , R 6 , R 7 and R 8 are independent of each other. Further, it may be an alkyl group having 1 to 6 carbon atoms or a phenyl group. The alkyl group may be a methyl group.
- a and c can be independently 6 to 2000, and may be 10 to 1000.
- b can be 2 to 30, and can be 5 to 20.
- the airgel according to the present embodiment includes at least one selected from the group consisting of a polysiloxane compound having a reactive group in the molecule and a hydrolysis product of the polysiloxane compound (hereinafter collectively referred to as “polysiloxane compound”). It may also be obtained by drying a wet gel produced from a sol containing “the like”. That is, the airgel layer is obtained by drying a wet gel formed from a sol containing at least one selected from the group consisting of a polysiloxane compound having a reactive group in the molecule and a hydrolysis product of the polysiloxane compound. You may be comprised from the layer which consists of.
- the airgel described so far is also produced from a sol containing at least one selected from the group consisting of a polysiloxane compound having a reactive group in the molecule and a hydrolysis product of the polysiloxane compound. It may be obtained by drying a wet gel.
- the airgel layer according to the present embodiment dries a wet gel derived from a sol containing at least one selected from the group consisting of a polysiloxane compound having a reactive group in the molecule and a hydrolysis product of the polysiloxane compound. The layer formed may be.
- the airgel according to the present embodiment can have a three-dimensional network structure derived from the sol.
- the reactive group which a polysiloxane compound has is not specifically limited, For example, an alkoxy group, a silanol group, a hydroxyalkyl group, an epoxy group, a polyether group, a mercapto group, a carboxyl group, and a phenol group are mentioned. You may use the polysiloxane compound which has these reactive groups individually or in mixture of 2 or more types. Examples of the reactive group include an alkoxy group, a silanol group, a hydroxyalkyl group, and a polyether group from the viewpoint of improving the flexibility of the airgel, and further, from the viewpoint of improving the compatibility of the sol, the alkoxy group and the hydroxy group. An alkyl group is mentioned.
- the number of carbon atoms of the alkoxy group and hydroxyalkyl group can be 1 to 6, and from the viewpoint of further improving the flexibility of the airgel. It may be ⁇ 4.
- Examples of the polysiloxane compound having a hydroxyalkyl group in the molecule include those having a structure represented by the following general formula (4).
- the structure represented by the above general formula (1) can be introduced into the skeleton of the airgel.
- R 9 represents a hydroxyalkyl group
- R 10 represents an alkylene group
- R 11 and R 12 each independently represents an alkyl group or an aryl group
- n represents an integer of 1 to 50.
- examples of the aryl group include a phenyl group and a substituted phenyl group.
- the substituent of the substituted phenyl group include an alkyl group, a vinyl group, a mercapto group, an amino group, a nitro group, and a cyano group.
- two R 9 s may be the same or different from each other, and similarly two R 10 s may be the same or different from each other.
- two or more R 11 s may be the same or different, and similarly two or more R 12 s may be the same or different.
- R 9 includes, for example, a hydroxyalkyl group having 1 to 6 carbon atoms, and specifically includes a hydroxyethyl group and a hydroxypropyl group.
- examples of R 10 include an alkylene group having 1 to 6 carbon atoms, and specific examples include an ethylene group and a propylene group.
- R 11 and R 12 may each independently be an alkyl group having 1 to 6 carbon atoms or a phenyl group. The alkyl group may be a methyl group.
- n can be 2 to 30, and can be 5 to 20.
- polysiloxane compound having the structure represented by the general formula (4) commercially available products can be used.
- compounds such as X-22-160AS, KF-6001, KF-6002, and KF-6003 All of which are manufactured by Shin-Etsu Chemical Co., Ltd.
- compounds such as XF42-B0970, Fluid OFOH 702-4% all manufactured by Momentive.
- R 14 represents an alkyl group or an alkoxy group
- R 15 and R 16 each independently represent an alkoxy group
- R 17 and R 18 each independently represent an alkyl group or an aryl group
- m is An integer from 1 to 50 is shown.
- examples of the aryl group include a phenyl group and a substituted phenyl group.
- the substituent of the substituted phenyl group include an alkyl group, a vinyl group, a mercapto group, an amino group, a nitro group, and a cyano group.
- two R 14 s may be the same or different
- two R 15 s may be the same or different.
- two R 14 Each 16 may be the same or different.
- when m is an integer of 2 or more
- two or more R 17 s may be the same or different
- similarly two or more R 18 are each the same. May be different.
- examples of R 14 include an alkyl group having 1 to 6 carbon atoms and an alkoxy group having 1 to 6 carbon atoms. Groups and ethoxy groups.
- R 15 and R 16 may each independently be an alkoxy group having 1 to 6 carbon atoms. Examples of the alkoxy group include a methoxy group and an ethoxy group.
- R 17 and R 18 may each independently be an alkyl group having 1 to 6 carbon atoms or a phenyl group.
- the alkyl group may be a methyl group.
- m can be 2 to 30, and may be 5 to 20.
- the polysiloxane compound having the structure represented by the general formula (5) can be obtained by appropriately referring to the production methods reported in, for example, JP-A Nos. 2000-26609 and 2012-233110. Can do.
- the polysiloxane compound having an alkoxy group in the molecule may exist as a hydrolysis product in the sol.
- the polysiloxane compound having an alkoxy group in the molecule and Decomposition products may be mixed. Further, in the polysiloxane compound having an alkoxy group in the molecule, all of the alkoxy groups in the molecule may be hydrolyzed or partially hydrolyzed.
- polysiloxane compounds having a reactive group in the molecule and hydrolysis products of the polysiloxane compounds may be used alone or in combination of two or more.
- the sol containing the polysiloxane compound or the like is selected from the group consisting of a silicon compound having a hydrolyzable functional group in the molecule and a hydrolysis product of the silicon compound. At least one kind (hereinafter, these may be collectively referred to as “silicon compounds and the like”).
- the number of silicon atoms in the molecule of the silicon compound can be 1 or 2.
- the silicon compound having a hydrolyzable functional group in the molecule is not particularly limited, and examples thereof include alkyl silicon alkoxides.
- alkyl silicon alkoxides from the viewpoint of improving water resistance, the number of hydrolyzable functional groups may be 3 or less.
- the alkyl silicon alkoxide include methyltrimethoxysilane, methyldimethoxysilane, and ethyltrimethoxysilane.
- the number of hydrolyzable functional groups is 3 or less, and vinyl trimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyl which are silicon compounds having a reactive group in the molecule.
- Methyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, N- Phenyl-3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, and the like can also be used.
- bistrimethoxysilylmethane bistrimethoxysilylethane, bistrimethoxysilylhexane, etc., which are silicon compounds having 3 or less hydrolyzable functional groups at the molecular ends can also be used.
- silicon compounds may be used alone or in combination of two or more.
- the airgel according to this embodiment may be obtained by drying a wet gel generated from a sol containing silica particles. That is, the airgel layer may be composed of a layer obtained by drying a wet gel generated from a sol containing silica particles. The airgel layer is a layer in which silica particles are combined. In addition, the airgel described so far may also be obtained by drying a wet gel generated from a sol containing silica particles.
- the airgel containing silica particles according to the present embodiment can have a structure represented by the following general formula (6).
- R 19 represents an alkyl group.
- the alkyl group include an alkyl group having 1 to 6 carbon atoms, and specifically include a methyl group.
- the airgel containing silica particles according to the present embodiment can have a structure represented by the following general formula (7).
- R 20 and R 21 each independently represents an alkyl group.
- the alkyl group include an alkyl group having 1 to 6 carbon atoms, and specifically include a methyl group.
- the airgel containing silica particles according to the present embodiment can have a structure represented by the following general formula (8).
- R 22 represents an alkylene group.
- the alkylene group include an alkylene group having 1 to 10 carbon atoms, and specific examples include an ethylene group and a hexylene group.
- the silica particles can be used without any particular limitation, and examples thereof include amorphous silica particles.
- examples of the amorphous silica particles include fused silica particles, fumed silica particles, and colloidal silica particles.
- colloidal silica particles have high monodispersibility and are easy to suppress aggregation in the sol.
- the shape of the silica particles is not particularly limited, and examples thereof include spherical, eyebrows, and association types. Among these, by using spherical particles as silica particles, it becomes easy to suppress aggregation in the sol.
- the average primary particle diameter of the silica particles can easily be imparted with an appropriate strength to the airgel, and an airgel excellent in shrinkage resistance during drying can be easily obtained. It may be 10 nm or more.
- the average primary particle diameter of the silica particles can be 500 nm or less, and may be 300 nm or less because it is easy to suppress the solid heat conduction of the silica particles and it is easy to obtain an airgel excellent in heat insulation. 250 nm or less. That is, the average primary particle diameter of the silica particles can be 1 to 500 nm, can be 5 to 300 nm, and can be 10 to 250 nm.
- the airgel layer which concerns on this embodiment may be comprised by the layer containing the airgel which has a structure derived from polysiloxane.
- a structure derived from polysiloxane the structure represented by the said general formula (1), (2), (3), (6), (7) or (8) is mentioned, for example. Therefore, the airgel which concerns on this embodiment may have at least 1 type among the structures represented by the said General formula (6), (7) and (8), without containing a silica particle. .
- the number of silanol groups per gram of silica particles can be 10 ⁇ 10 18 pieces / g or more, and may be 50 ⁇ 10 18 pieces / g or more. 100 ⁇ 10 18 pieces / g or more.
- the number of silanol groups per gram of silica particles can be 1000 ⁇ 10 18 pieces / g or less, and may be 800 ⁇ 10 18 pieces / g or less. It may be 700 ⁇ 10 18 pieces / g or less.
- the number of silanol groups per gram of silica particles can be 10 ⁇ 10 18 to 1000 ⁇ 10 18 pcs / g, or 50 ⁇ 10 18 to 800 ⁇ 10 18 pcs / g, It may be 10 18 to 700 ⁇ 10 18 pieces / g.
- the content of the polysiloxane compound contained in the sol and the hydrolysis product of the polysiloxane compound is 5 parts by mass or more with respect to 100 parts by mass of the total amount of the sol. It may be 10 parts by mass or more, and it becomes easier to obtain good compatibility, so that it can be 50 parts by mass or less, or 30 parts by mass or less. That is, the content of the polysiloxane compound and the hydrolysis product of the polysiloxane compound may be 5 to 50 parts by mass with respect to 100 parts by mass of the sol, and may be 10 to 30 parts by mass. .
- the sol when the sol further contains a silicon compound or the like, the sum of the contents of the polysiloxane compound and the like and the silicon compound or the like makes it easier to obtain good reactivity, so the total amount of the sol is 100 parts by mass. 5 parts by mass or more, may be 10 parts by mass or more, and since it becomes easier to obtain good compatibility, it can be 50 parts by mass or less, and 30 parts by mass or less. Also good. That is, the total content of the polysiloxane compound and the like and the silicon compound and the like can be 5 to 50 parts by mass, and may be 10 to 30 parts by mass.
- the ratio of the content of the polysiloxane compound and the like and the content of the hydrolysis product such as the silicon compound can be 1: 0.5 to 1: 4, and 1: 1 to 1: 2. There may be.
- the ratio of the content of these compounds is 1: 0.5 or more, good compatibility is further easily obtained, and when the ratio is 1: 4 or less, gel shrinkage is further easily suppressed.
- the content of the silica particles contained in the sol is 1 mass relative to 100 mass parts of the total amount of the sol. It may be 4 parts by mass or more.
- the content of silica particles contained in the sol can be 20 parts by mass or less, and 15 masses. Or less. That is, the content of silica particles can be 1 to 20 parts by mass with respect to 100 parts by mass of the total amount of sol, and may be 4 to 15 parts by mass.
- the thickness of the airgel layer can be 1 ⁇ m or more because it is easy to obtain good heat insulation, and can be 10 ⁇ m or more, or 30 ⁇ m or more.
- the thickness of the airgel layer can be 200 ⁇ m or less, may be 100 ⁇ m or less, and may be 80 ⁇ m or less. That is, the thickness of the airgel layer may be 1 to 200 ⁇ m, may be 10 to 100 ⁇ m, and may be 30 to 80 ⁇ m.
- density at 25 ° C. of the airgel layer may be a 0.05 g / cm 3 or more, may also be 0.1 g / cm 3 or more, 0.2 g / Cm 3 or more.
- the density of the airgel layer at 25 ° C. can be set to 0.3 g / cm 3 or less, and may be 0.25 g / cm 3 or less. / Cm 3 or less. That is, the density of the airgel layer at 25 ° C. can be 0.05 to 0.3 g / cm 3 , or 0.1 to 0.25 g / cm 3 , or 0.1 to 0.2 g / cm 3. cm 3 may also be used.
- the porosity of the airgel layer at 25 ° C. can be 85% or more, may be 87% or more, and from the viewpoint of obtaining better strength and flexibility. It can be 95% or less, and may be 93% or less. That is, the porosity of the airgel layer at 25 ° C. can be 85 to 95%, and may be 87 to 93%.
- the density and porosity of the airgel layer can be measured by a mercury intrusion method according to DIN 66133.
- a mercury intrusion method according to DIN 66133.
- Autopore IV9520 manufactured by Shimadzu Corporation, product name
- Shimadzu Corporation product name
- the support according to the present embodiment is a non-aerogel layer, and the structure of the support is not particularly limited, and may be a single layer or a multilayer.
- the support member include a film-like support and a foil-like support.
- the film-like support is formed by forming a polymer raw material into a thin film, and examples thereof include resin films such as polyolefin, polyester, polycarbonate, and polyimide.
- the resin film may be a metal vapor deposition film.
- a metal vapor deposition film an aluminum vapor deposition film, a silver vapor deposition film, etc. are mentioned, for example.
- the foil-shaped support is formed by forming a metal raw material into a thin film, and examples thereof include an aluminum foil and a copper foil.
- the mold may be subjected to a release treatment on the surface of the support on which the airgel layer is not laminated.
- the thickness of the support is not particularly limited, but may be 3 ⁇ m or more from the viewpoint of handling properties, may be 5 ⁇ m or more, and may be 7 ⁇ m or more.
- the thickness of the support can be 100 ⁇ m or less, may be 80 ⁇ m or less, and may be 50 ⁇ m or less. That is, the thickness of the support may be 3 to 100 ⁇ m, may be 5 to 80 ⁇ m, and may be 7 to 50 ⁇ m.
- the method for producing an airgel laminate of the present embodiment includes a step of washing a wet gel laminate having a support and a wet gel layer provided on the support in a roll-to-roll manner. It can manufacture by the method provided with.
- the airgel laminate according to this embodiment includes a support and an airgel layer having a thickness of 200 ⁇ m or less provided on the support.
- the airgel laminate according to the present embodiment includes a sol generation step for producing a sol for forming an airgel, and a sol obtained in the sol generation step while feeding the support wound in a roll shape.
- a wet gel production process in which a wet gel layer is obtained by aging and then aging after coating on the gel, and a wet gel laminate obtained by laminating the wet gel layer obtained in the wet gel production process is washed by a roll-to-roll method. It can manufacture by the manufacturing method mainly provided with the washing
- the washed wet gel laminate may be subjected to solvent replacement before entering the drying step, if necessary.
- the sol is a state before the gelation reaction occurs, and in the present embodiment, the silicon compound and the like, in some cases a polysiloxane compound and the like, and silica particles are dissolved or dispersed in a solvent.
- the wet gel means a gel solid in a wet state that contains a liquid medium but does not have fluidity.
- a drying step it is possible to take a system in which a film fed from a roll is continuously processed and wound up after being processed.
- a washing step (if necessary) a solvent replacement step, and a drying step are continued.
- the formed airgel laminate can be wound into a roll to produce an airgel laminate roll.
- generation process may be wound up in roll shape.
- the wet gel layer may be washed while winding the roll-like wet gel laminate, and then may be taken up again in a roll shape, or may proceed to the drying step without being taken up.
- sol generation process In the sol generation step, the above-mentioned silicon compound and a solvent containing a polysiloxane compound and / or silica particles are mixed in some cases, followed by a hydrolysis reaction, followed by a sol-gel reaction to form a semi-gelled sol coating liquid. It is a process to obtain.
- an acid catalyst may be further added to the solvent in order to promote the hydrolysis reaction.
- a surfactant, a thermally hydrolyzable compound, and the like can be added to the solvent.
- a base catalyst may be added to promote the gelation reaction.
- the solvent is not particularly limited as long as good coating properties can be obtained in the coating step described later, and for example, water or a mixed solution of water and alcohol can be used.
- the alcohol include methanol, ethanol, n-propanol, 2-propanol, n-butanol, 2-butanol and t-butanol.
- water can be used because of its high surface tension and low volatility.
- the acid catalyst examples include inorganic acids such as hydrofluoric acid, hydrochloric acid, nitric acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphorous acid, hypophosphorous acid, odorous acid, chloric acid, chlorous acid, and hypochlorous acid; Acid phosphates such as aluminum phosphate, acid magnesium phosphate and acid zinc phosphate; organic acids such as acetic acid, formic acid, propionic acid, oxalic acid, malonic acid, succinic acid, citric acid, malic acid, adipic acid, azelaic acid Carboxylic acids are mentioned. Among these, organic carboxylic acids can be used as an acid catalyst that further improves the water resistance of the obtained airgel layer. Specific examples include acetic acid, formic acid, propionic acid, oxalic acid, and malonic acid. It may be. You may use these individually or in mixture of 2 or more types.
- the addition amount of the acid catalyst can be 0.001 to 0.1 parts by mass with respect to 100 parts by mass of the total amount of the silicon compound and the polysiloxane compound.
- a nonionic surfactant As the surfactant, a nonionic surfactant, an ionic surfactant, or the like can be used. You may use these individually or in mixture of 2 or more types.
- nonionic surfactant examples include those containing a hydrophilic part such as polyoxyethylene and a hydrophobic part mainly composed of an alkyl group, and those containing a hydrophilic part such as polyoxypropylene.
- examples of those containing a hydrophilic part such as polyoxyethylene and a hydrophobic part mainly composed of an alkyl group include polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene alkyl ether and the like.
- examples of those containing a hydrophilic portion such as polyoxypropylene include polyoxypropylene alkyl ethers, block copolymers of polyoxyethylene and polyoxypropylene, and the like.
- a cationic surfactant As the ionic surfactant, a cationic surfactant, an anionic surfactant, an amphoteric surfactant, or the like can be used.
- the cationic surfactant include cetyltrimethylammonium bromide and cetyltrimethylammonium chloride.
- the anionic surfactant include sodium dodecyl sulfonate.
- amphoteric surfactants include amino acid surfactants, betaine surfactants, and amine oxide surfactants.
- amino acid surfactants include acyl glutamic acid.
- betaine surfactants include lauryldimethylaminoacetic acid betaine and stearyldimethylaminoacetic acid betaine.
- the amine oxide surfactant include lauryl dimethylamine oxide.
- These surfactants act to reduce the difference in chemical affinity between the solvent in the reaction system and the growing siloxane polymer in the coating process described later, and to suppress phase separation. It is considered.
- the amount of the surfactant added depends on the type of the surfactant or the types and amounts of the silicon compound and the polysiloxane compound.
- the amount of the surfactant added is 1 to 100 parts by mass with respect to 100 parts by mass of the total amount of the silicon compound and the polysiloxane compound.
- the amount may be 100 parts by mass, and may be 5 to 60 parts by mass.
- thermohydrolyzable compound is considered to generate a base catalyst by thermal hydrolysis, thereby making the reaction solution basic and promoting the sol-gel reaction. Accordingly, the thermohydrolyzable compound is not particularly limited as long as it can make the reaction solution basic after hydrolysis.
- urea for example, urea; formamide, N-methylformamide, N, N-dimethylformamide, acetamide And acid amides such as N-methylacetamide and N, N-dimethylacetamide; and cyclic nitrogen compounds such as hexamethylenetetramine.
- urea is particularly easy to obtain the above-mentioned promoting effect.
- the amount of the thermally hydrolyzable compound added is not particularly limited as long as it is an amount that can sufficiently promote the sol-gel reaction.
- the amount added can be 1 to 200 parts by mass with respect to 100 parts by mass of the total amount of silicon compound and polysiloxane compound, and 2 to 150 parts by mass. It may be. By making the addition amount 1 mass part or more, it becomes easier to obtain good reactivity, and by making it 200 mass parts or less, it becomes easier to further suppress the precipitation of crystals and the decrease in gel density.
- the hydrolysis in the sol production step depends on the type and amount of silicon compound, polysiloxane compound, silica particles, acid catalyst, surfactant, etc. in the mixed solution, but for example in a temperature environment of 20-60 ° C.
- the treatment may be performed for 10 minutes to 24 hours, or may be performed at a temperature environment of 50 to 60 ° C. for 5 minutes to 8 hours.
- the hydrolyzable functional group in a silicon compound and a polysiloxane compound is fully hydrolyzed, and the hydrolysis product of a silicon compound and the hydrolysis product of a polysiloxane compound can be obtained more reliably.
- the temperature environment of the sol generation step may be adjusted to a temperature that suppresses hydrolysis of the thermohydrolyzable compound and suppresses gelation of the sol. .
- the temperature at this time may be any temperature as long as the hydrolysis of the thermally hydrolyzable compound can be suppressed.
- the temperature environment of the sol production step can be 0 to 40 ° C., and may be 10 to 30 ° C.
- Base catalysts include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide, potassium hydroxide, and cesium hydroxide; ammonium compounds such as ammonium hydroxide, ammonium fluoride, ammonium chloride, and ammonium bromide; sodium metaphosphate Basic sodium phosphates such as sodium pyrophosphate and sodium polyphosphate; allylamine, diallylamine, triallylamine, isopropylamine, diisopropylamine, ethylamine, diethylamine, triethylamine, 2-ethylhexylamine, 3-ethoxypropylamine, diisobutylamine, 3 -(Diethylamino) propylamine, di-2-ethylhexylamine, 3- (dibutylamino) propylamine, tetramethylethylenediamine, t-butylamine, sec Aliphatic amines such as butylamine, propylamine, 3- (
- ammonium hydroxide (ammonia water) is excellent in that it has high volatility and does not easily remain in the airgel layer after drying, and thus does not impair water resistance, and is economical. You may use said base catalyst individually or in mixture of 2 or more types.
- the dehydration condensation reaction and / or dealcoholization condensation reaction of silicon compounds, polysiloxane compounds, etc. and silica particles in the sol can be promoted, and the sol can be gelled in a shorter time. Can do.
- ammonia is highly volatile and hardly remains in the airgel layer. Therefore, by using ammonia as a base catalyst, an airgel layer with better water resistance can be obtained.
- the addition amount of the base catalyst may be 0.5 to 5 parts by mass with respect to 100 parts by mass of the total amount of the silicon compound and the polysiloxane compound, and may be 1 to 4 parts by mass.
- the sol-gel reaction in the sol production step requires that the sol be in a semi-gelled state for the purpose of obtaining good coating properties in the coating step described later.
- This reaction is preferably performed in a sealed container so that the solvent and the base catalyst do not volatilize.
- the gelation temperature depends on the type and amount of silicon compound, polysiloxane compound, silica particles, acid catalyst, surfactant, base catalyst, etc. in the sol, but can be 30 to 90 ° C., It may be 40-80 ° C. By setting the gelation temperature to 30 ° C. or higher, gelation can be performed in a shorter time, and by setting the gelation temperature to 90 ° C. or lower, sudden gelation can be suppressed.
- the sol-gel reaction time varies depending on the gelation temperature
- the gelation time may be shortened as compared with a sol applied to a conventional aerogel. it can.
- the reason is presumed that the silanol groups and / or reactive groups possessed by the polysiloxane compound and the like in the sol form hydrogen bonds and / or chemical bonds with the silanol groups of the silica particles.
- the gelation time can be 10 to 360 minutes, and may be 20 to 180 minutes.
- the gelation time By setting the gelation time to 10 minutes or more, the viscosity of the sol is improved, and it becomes easy to obtain good coating properties in the coating process described later, and by setting it to 360 minutes or less, the complete gelation of the sol is suppressed. And it becomes easy to obtain adhesiveness with the support body which is a non-aerogel layer.
- the wet gel generation step includes a coating step in which the semi-gelled sol coating solution obtained in the sol generation step is applied to a support to be gelled to form a gel layer, and the gel layer is aged. And an aging step for forming a wet gel layer.
- the sol coating liquid is applied to a support and dried to gel the sol coating liquid to form a gel layer on the surface of the support.
- this gel layer is in a state in which an adhesive force with the support is ensured.
- a die coater, a comma coater, a bar coater, a kiss coater, a roll coater or the like can be used, and it is appropriately used depending on the thickness of the wet gel layer.
- the coating film comprising the sol coating liquid after coating can be dried by heating or the like.
- the thickness of the wet gel layer can be adjusted according to the thickness of the airgel layer finally formed. From the viewpoint of winding the wet gel laminate in a roll shape, the upper limit of the thickness of the wet gel layer may be 400 ⁇ m or less, 200 ⁇ m or less, 160 ⁇ m or less, The lower limit of the thickness can be 1 ⁇ m or more, 20 ⁇ m or more, or 60 ⁇ m or more.
- Drying after applying the sol coating liquid to the support can be performed, for example, under the condition that the moisture content of the gel layer after drying is 10% by mass or more, and may be performed under the condition of 50% by mass or more. .
- the water content of the wet gel layer By setting the water content of the wet gel layer to 10% by mass, it becomes easy to obtain adhesion to the support.
- the drying temperature varies depending on the amount of water and / or the amount of the organic solvent in the sol coating liquid and the boiling point of the organic solvent, but may be, for example, 50 to 150 ° C. or 60 to 120 ° C. By setting the drying temperature to 50 ° C. or higher, gelation can be performed in a shorter time, and by setting the drying temperature to 150 ° C. or lower, it becomes easy to obtain adhesion to the support.
- the drying time varies depending on the drying temperature, but can be, for example, 0.2 to 10 minutes, or 0.5 to 8 minutes. By setting the drying time to 0.2 minutes or more, a wet gel layer is easily formed, and by setting the drying time to 10 minutes or less, it becomes easy to obtain adhesion to the support.
- the drying conditions can be set as appropriate by simple experiments in advance.
- a separator can be further laminated on the surface of the gel layer opposite to the support side. By laminating the separator, it is possible to prevent transfer of the wet gel surface to the back surface of the support when the wet gel laminate is rolled up.
- the separator when the separator is laminated, for example, the separator may be laminated after the sol coating liquid is applied, or may be laminated after the coating film made of the sol coating liquid is dried.
- the separator include resin films made of resins such as polyolefin, polyester, polycarbonate, and polyimide, metal foils such as copper foil and aluminum foil, and release paper.
- a resin film when laminating the separator after applying the sol coating liquid, a resin film can be used from the viewpoint of keeping the moisture content of the gel layer high.
- the separator may be subjected to a release treatment such as a mat treatment or a corona treatment.
- the aging step is a step of aging the gel layer formed by the coating step to form a wet gel layer.
- the aging step may be performed by winding a laminate in which a gel layer is formed on a support in a roll shape.
- the wet gel layer may be aged so that the moisture content is 10% by mass or more, and 50% by mass or more. Aging is better.
- the aging method is not particularly limited as long as the above range is satisfied, and examples include a method of aging in a sealed atmosphere and a method of aging using a thermo-hygrostat that can suppress a decrease in moisture content due to heating. .
- the aging temperature can be, for example, 40 to 90 ° C., and may be 50 to 80 ° C.
- the aging temperature can be, for example, 40 to 90 ° C. or higher, the aging time can be shortened, and by setting it to 90 ° C. or lower, it is possible to suppress a decrease in water content.
- the aging time can be, for example, 1 to 48 hours, and may be 3 to 24 hours. By setting the aging time to 1 hour or longer, excellent heat insulating properties can be obtained, and by setting it to 48 hours or shorter, high adhesion to the support can be obtained.
- the washing step is a step (washing step) of washing the wet gel laminate obtained by the wet gel production step by a roll-to-roll method. When the wet gel laminate is wound into a roll, it is unwound and washed.
- the washing step may further include a step of replacing with a solvent suitable for the drying step described later (solvent replacement step).
- solvent replacement step is not particularly limited.
- the washing and solvent replacement step can be performed in a form in which only the solvent replacement step is performed without the step of washing the wet gel laminate, but impurities such as unreacted substances and by-products in the wet gel layer are reduced.
- the wet gel layer after aging may be washed. Since the cleaning process can be performed in a roll-to-roll manner, the manufacturing process, manufacturing time, and the like of the airgel laminate can be shortened, resulting in excellent productivity.
- washing step it is preferable to repeatedly wash the airgel layer with water or an organic solvent with respect to the wet gel laminate obtained in the wet gel production step.
- Organic solvents include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, acetone, methyl ethyl ketone, 1,2-dimethoxyethane, acetonitrile, hexane, toluene, diethyl ether, chloroform, ethyl acetate, tetrahydrofuran, methylene chloride , N, N-dimethylformamide, dimethyl sulfoxide, acetic acid, formic acid, and other various organic solvents can be used. You may use said organic solvent individually or in mixture of 2 or more types.
- the organic solvent used in the washing step is preferably a hydrophilic organic solvent having high mutual solubility in both water and a low surface tension solvent.
- the hydrophilic organic solvent used in the washing step can serve as a preliminary replacement for the solvent replacement step. Therefore, among the above organic solvents, hydrophilic organic solvents such as methanol, ethanol, 2-propanol, acetone, and methyl ethyl ketone can be used. Further, from the viewpoint of economy, methanol, ethanol, or methyl ethyl ketone can be used. Good.
- the amount of water or organic solvent used in the washing step can be an amount that can sufficiently replace the solvent in the wet gel layer and can be washed, and is an amount 3 to 10 times the volume of the wet gel layer. These solvents can be used.
- the washing can be repeated until the water content in the airgel layer after washing becomes 10% by mass or less.
- the temperature in the washing step can be set to a temperature equal to or lower than the boiling point of the solvent used for washing.
- the temperature can be about 30 to 60 ° C.
- the solvent contained in the washed wet gel layer is replaced with a predetermined replacement solvent in order to suppress shrinkage of the wet gel layer in the drying step described later.
- the replacement efficiency can be improved by heating.
- Specific examples of the solvent for substitution include a low surface tension solvent described later in the drying step when drying is performed under atmospheric pressure at a temperature lower than the critical point of the solvent used for drying.
- ethanol, methanol, 2-propanol, dichlorodifluoromethane, or carbon dioxide may be used alone as a substitution solvent, and a solvent in which two or more of these are mixed is used. Also good.
- Examples of the low surface tension solvent include those having a surface tension at 20 ° C. of 30 mN / m or less. The surface tension may be 25 mN / m or less, or 20 mN / m or less.
- Examples of the low surface tension solvent include pentane (15.5), hexane (18.4), heptane (20.2), octane (21.7), 2-methylpentane (17.4), 3- Aliphatic hydrocarbons such as methylpentane (18.1), 2-methylhexane (19.3), cyclopentane (22.6), cyclohexane (25.2), 1-pentene (16.0); Aromatic hydrocarbons such as (28.9), toluene (28.5), m-xylene (28.7), p-xylene (28.3); dichloromethane (27.9), chloroform (27.2) ), Carbon tetrachloride (26.9), 1-chloropropane (21.8), 2-ch
- the parenthesis indicates the surface tension at 20 ° C., and the unit is [mN / m].
- aliphatic hydrocarbons hexane, heptane, etc.
- a hydrophilic organic solvent such as acetone, methyl ethyl ketone, 1,2-dimethoxyethane
- it can be used as the organic solvent in the washing step.
- those having a boiling point of 100 ° C. or less at normal pressure may be used because they can be easily dried in the drying step described later. You may use said solvent individually or in mixture of 2 or more types.
- the amount of the solvent used in the solvent replacement step can be an amount that can sufficiently replace the solvent in the wet gel layer after washing, and the amount of the solvent is 3 to 10 times the volume of the wet gel layer. Can be used.
- the temperature in the solvent substitution step can be set to a temperature not higher than the boiling point of the solvent used for substitution.
- heptane when used, it can be about 30 to 60 ° C.
- the solvent replacement step is not necessarily essential as described above.
- the inferred mechanism is as follows.
- the silica particles function as a support for a three-dimensional network airgel skeleton, whereby the skeleton is supported and gel shrinkage in the drying process is suppressed. Therefore, it is considered that the gel can be directly transferred to the drying step without replacing the solvent used for washing.
- the separator when laminating the separator in the coating process, from the viewpoint of improving the efficiency of washing the wet gel layer and replacing the solvent, the separator is extracted before the washing process, and the separator is laminated again after the solvent substitution process. Also good.
- the drying method is not particularly limited, and known atmospheric pressure drying, supercritical drying, or freeze drying can be used. Among these, from the viewpoint of easy production of a low-density airgel layer, atmospheric pressure drying or Supercritical drying can be used. Further, atmospheric drying can be used from the viewpoint of enabling production at low cost.
- the normal pressure means 0.1 MPa (atmospheric pressure).
- the airgel laminate according to the present embodiment can be obtained by drying a wet gel layer that has been washed and solvent-substituted (if necessary) at a temperature below the critical point of the solvent used for drying under atmospheric pressure. It can.
- the drying temperature varies depending on the type of the substituted solvent (the solvent used for washing when solvent substitution is not performed) or the heat resistance of the support, but can be 60 to 180 ° C., and is 90 to 150 ° C. There may be.
- the drying time varies depending on the capacity of the wet gel layer and the drying temperature, but can be 2 to 48 hours. In the present embodiment, drying can be accelerated by applying pressure within a range that does not impair productivity.
- the airgel laminate according to the present embodiment may be pre-dried before the drying step from the viewpoint of improving the drying efficiency in atmospheric drying.
- the pre-drying method is not particularly limited.
- the pre-drying temperature can be 60 to 180 ° C., and may be 90 to 150 ° C.
- the predrying time can be 1 to 30 minutes.
- the airgel laminated body obtained by such predrying can be further dried in a drying process.
- the separators When the separators are laminated in the washing and solvent replacement step, the separators can be extracted before pre-drying and laminated again after pre-drying from the viewpoint of drying efficiency and transport efficiency.
- the separator When the washing and solvent replacement step to the drying step are performed continuously, the separator can be extracted before the washing step and laminated again after the pre-drying.
- the airgel laminate according to this embodiment can also be obtained by supercritical drying of a wet gel laminate that has been washed and solvent-substituted (if necessary).
- Supercritical drying can be performed by a known method.
- the supercritical drying method include a method of removing the solvent at a temperature and pressure higher than the critical point of the solvent contained in the wet gel layer.
- the airgel layer is immersed in liquefied carbon dioxide under conditions of, for example, about 20 to 25 ° C. and about 5 to 20 MPa, so that all or one of the solvents contained in the wet gel layer can be obtained.
- Examples include a method of removing carbon dioxide alone or a mixture of carbon dioxide and a solvent after replacing a part with carbon dioxide having a lower critical point than the solvent.
- FIG. 2 is a process diagram showing an embodiment of the airgel laminate manufacturing process according to the present embodiment.
- the roll-shaped wet gel laminate 100 a produced in the wet gel generation step is unwound and moved by the rotating roll 12, and is washed by a roll-to-roll method while passing through the washing tank 14.
- the number of cleaning tanks 14 is not limited, and a part of them may be used as a solvent replacement tank.
- the washed wet gel laminate is moved by the rotating roll 16 and dried while passing through the drying furnace 18, and wound around the core to obtain the airgel laminated roll 100.
- FIG. 3 is a perspective view schematically showing a preferred embodiment of an airgel laminated roll.
- the airgel laminated roll 100 includes a cylindrical winding core 11 and an airgel laminated body 10 wound around the winding core 11 in a roll shape. That is, the airgel laminated roll 100 according to the present embodiment winds the airgel laminated body 10 having the support 2 and the airgel layer 1 having a thickness of 200 ⁇ m or less provided on the support 2 around the core 11. Become.
- the material of the cylindrical core is not particularly limited, and examples thereof include a paper tube, a wood tube, a plastic tube, and a metal tube.
- examples of the plastic include polyethylene resin, polypropylene resin, polystyrene resin, polyvinyl chloride resin, ABS resin (acrylonitrile-butadiene-styrene copolymer).
- the airgel laminated roll of the present embodiment can be handled in a roll shape because it is possible to reduce the thickness of the airgel, which has been difficult to handle in the past.
- the airgel laminate according to the present embodiment can be used as a heat insulating material having excellent heat insulating properties and flexibility, and the heat insulating material can be thinned.
- the airgel laminate according to the present embodiment is used for heat insulation in the cryogenic field (superconductivity, cryogenic container, etc.), the space field, the building field, the automobile field, the home appliance, the semiconductor field, and industrial equipment. It can be applied to use as a material.
- the airgel laminated body which concerns on this embodiment can be utilized as a water-repellent sheet, a sound-absorbing sheet, a static vibration sheet, a catalyst carrying sheet etc. besides the use as a heat insulating material.
- Example 1 [Sol coating solution 1] 2000.0 parts by mass of water, 1.00 parts by mass of acetic acid as an acid catalyst, and 200 cetyltrimethylammonium bromide bromide (manufactured by Wako Pure Chemical Industries, Ltd., hereinafter abbreviated as “CTAB”) as a cationic surfactant.
- CTAB cetyltrimethylammonium bromide bromide
- the sol coating liquid 1 is gelated on a double-sided aluminum vapor-deposited PET film (product name: VM-PET, manufactured by Hitachi AIC Co., Ltd.) having a length of 30 m ⁇ (width) 600 mm ⁇ (thickness) 12 ⁇ m as a support.
- the film was coated with a comma coater so that the thickness of the film became 40 ⁇ m, dried at 60 ° C. for 5 minutes, and wound on a core to obtain a roll-shaped wet gel laminate. Thereafter, the obtained wet gel laminate was aged at 60 ° C. for 8 hours with a dryer.
- the roll-shaped wet gel laminate was unwound, and the roll surface length was increased in the order of the first tank containing 600 L of water, the second tank containing 600 L of methanol, and the third tank containing 600 L of methanol. It was washed by a roll-to-roll method while passing so as to be immersed for 6 seconds per meter. Thereafter, the washed wet gel laminate is dried for 10 minutes in a 120 ° C. drying furnace by a roll-to-roll method, and wound around a winding core to represent a structure represented by the above general formulas (6) and (7).
- the airgel laminated roll 1 provided with the airgel laminated body which has this was obtained.
- Example 2 [Sol coating liquid 2] 2000.0 parts by mass of water, 1.00 parts by mass of acetic acid as an acid catalyst, 200.0 parts by mass of CTAB as a cationic surfactant, and 1200.0 parts by mass of urea as a thermohydrolyzable compound were mixed.
- a bifunctional bifunctional alkoxy-modified polysiloxane compound (hereinafter referred to as “polysiloxane compound A”) having a structure represented by the above general formula (5) as 800.0 parts by mass of MTMS as a silicon compound and a polysiloxane compound. 200.0 parts by mass were added and reacted at 25 ° C. for 2 hours. Thereafter, a sol-gel reaction was performed at 60 ° C. for 5 hours to obtain a sol coating liquid 2.
- the “polysiloxane compound A” was synthesized as follows. First, in a 1 liter three-necked flask equipped with a stirrer, a thermometer, and a Dimroth condenser, 100.0% of dimethylpolysiloxane having silanol groups at both ends (product name: XC96-723) was obtained. Part by mass, 181.3 parts by mass of methyltrimethoxysilane and 0.50 parts by mass of t-butylamine were mixed and reacted at 30 ° C. for 5 hours. Thereafter, this reaction solution was heated at 140 ° C. for 2 hours under reduced pressure of 1.3 kPa to remove volatile components, thereby obtaining a bifunctional alkoxy-modified polysiloxane compound (polysiloxane compound A) at both ends.
- Airgel laminated roll 2 Using the sol coating liquid 2, an airgel laminated roll comprising an airgel laminated body having a structure represented by the general formulas (2), (3), (6) and (7) in the same manner as in Example 1. 2 was obtained.
- Example 3 [Sol coating solution 3] 2000.0 parts by mass of water, 1.00 parts by mass of acetic acid as an acid catalyst, 200.0 parts by mass of CTAB as a cationic surfactant, and 1200.0 parts by mass of urea as a thermohydrolyzable compound were mixed.
- a bifunctional trifunctional alkoxy-modified polysiloxane compound (hereinafter referred to as “polysiloxane compound B”) having a structure represented by the general formula (5) as MTMS as a silicon compound and 600.0 parts by mass as a polysiloxane compound. 400.0 parts by mass were added and reacted at 25 ° C. for 2 hours. Thereafter, a sol-gel reaction was performed at 60 ° C. for 2 hours to obtain a sol coating liquid 6.
- the “polysiloxane compound B” was synthesized as follows. First, in a 1 liter three-necked flask equipped with a stirrer, a thermometer, and a Dimroth condenser, 100.0 parts by mass of XC96-723, 202.6 parts by mass of tetramethoxysilane and 0. 50 parts by mass was mixed and reacted at 30 ° C. for 5 hours. Thereafter, this reaction solution was heated at 140 ° C. for 2 hours under a reduced pressure of 1.3 kPa to remove volatile components, thereby obtaining a trifunctional alkoxy-modified polysiloxane compound (polysiloxane compound B) at both ends.
- Airgel laminated roll 3 Using the sol coating liquid 3, an airgel laminated roll 3 including an airgel laminated body having a structure represented by the general formulas (2) and (6) was obtained in the same manner as in Example 1.
- Example 4 As a silica particle-containing raw material, PL-2L (manufactured by Fuso Chemical Industry Co., Ltd., product name, average primary particle size: 20 nm, solid content: 20% by mass) is 1000.0 parts by mass, water is 1000.0 parts by mass, acid 1.00 parts by mass of acetic acid as a catalyst, 200.0 parts by mass of CTAB as a cationic surfactant, and 1200.0 parts by mass of urea as a thermohydrolyzable compound are mixed with 600.0 MTMS as a silicon compound.
- PL-2L manufactured by Fuso Chemical Industry Co., Ltd., product name, average primary particle size: 20 nm, solid content: 20% by mass
- water 1000.0 parts by mass
- acid 1.00 parts by mass of acetic acid as a catalyst 200.0 parts by mass of CTAB as a cationic surfactant
- 1200.0 parts by mass of urea as a thermohydrolyzable compound are mixed with 600.0 MTMS as a silicon compound.
- Airgel laminated roll 4 Using the sol coating liquid 4, an airgel laminated roll 4 including an airgel laminated body having a structure represented by the general formulas (1), (6) and (7) was obtained in the same manner as in Example 1. .
- Airgel laminated roll 5 An airgel laminating roll comprising an airgel laminate having the structure represented by the general formulas (2), (3), (6) and (7) in the same manner as in Example 1 using the sol coating liquid 5. 5 was obtained.
- Example 6 [Sol coating liquid 6] 1000.0 parts by mass of PL-2L as a silica particle-containing raw material, 1000.0 parts by mass of water, 1.00 parts by mass of acetic acid as an acid catalyst, 200.0 parts by mass of CTAB as a cationic surfactant, and hot water addition 1200.0 parts by mass of urea is mixed as a decomposable compound, and 600.0 parts by mass of MTMS and 200.0 parts by mass of DMDMS as silicon compounds, and 200.0 parts by mass of polysiloxane compound B as a polysiloxane compound. In addition, the mixture was reacted at 25 ° C. for 2 hours. Thereafter, a sol-gel reaction was performed at 60 ° C. for 1.0 hour to obtain a sol coating solution 10.
- Airgel laminated roll 6 Using the sol coating liquid 6, an airgel laminated roll 6 including an airgel laminated body having a structure represented by the general formulas (2), (6) and (7) was obtained in the same manner as in Example 1. .
- Example 7 An airgel laminate having a structure represented by the above general formulas (2), (3), (6) and (7) was obtained in the same manner as in Example 5 except that the thickness after gelation was changed to 20 ⁇ m. The airgel laminated roll 7 provided was obtained.
- Example 8 An airgel laminate having a structure represented by the above general formulas (2), (3), (6) and (7) was obtained in the same manner as in Example 5 except that the thickness after gelation was changed to 100 ⁇ m. The airgel laminated roll 8 provided was obtained.
- Example 9 An airgel laminate having a structure represented by the above general formulas (2), (3), (6) and (7) was obtained in the same manner as in Example 5 except that the thickness after gelation was changed to 150 ⁇ m. The airgel laminated roll 9 provided was obtained.
- Example 10 [Airgel laminated roll 10]
- the roll-shaped wet gel laminate is composed of a first tank containing 600 L of water, a second tank 1 containing 600 L of methanol, a third tank containing 600 L of methanol, and a fourth tank containing 600 L of methyl ethyl ketone.
- An airgel laminate having a structure represented by the above general formulas (2), (3), (6) and (7) was obtained in the same manner as in Example 5 except that the airgel laminate was washed in a roll-to-roll manner while being passed in order.
- the airgel laminated roll 10 provided was obtained.
- Example 11 [Airgel laminated roll 11] Except for laminating a separator (manufactured by Daiki Shoji, product name: OKILON-Sha2520) on the surface of the gel layer opposite to the support side when the wet gel laminate was wound into a roll, the same as Example 5 Thus, an airgel laminated roll 11 comprising an airgel laminated body having a structure represented by the general formulas (2), (3), (6) and (7) was obtained.
- An airgel laminated roll is made of a sheet A of (length) 606 mm ⁇ (width) 343 mm, a sheet B of (length) 612 mm ⁇ (width) 362 mm, and (length) 618 mm ⁇ ( The sheet was processed into a size of a sheet C having a width of 380 mm, a sheet D having a diameter of 105 mm, a sheet E having a diameter of 112 mm, and a sheet F having a diameter of 118 mm.
- a sheet for liquid nitrogen container outer periphery a sheet A10 in which 10 layers of sheet A are laminated so that adjacent supports are not in direct contact with each other via an airgel layer, a sheet B10 in which 10 layers of sheet B are laminated, and a sheet C Ten sheets of laminated sheets C10 were produced.
- a sheet D10 obtained by laminating 10 layers of sheet D a sheet E10 obtained by laminating 10 layers of sheet E, and a sheet F10 obtained by laminating 10 layers of sheet F were produced.
- a liquid nitrogen container having a height of 600 mm and a diameter of 100 mm was prepared, a sheet A10 was disposed on the side surface, sheets D10 were disposed above and below the liquid nitrogen container, and the liquid nitrogen container was wound around the liquid nitrogen container.
- the sheet B10 is disposed on the sheet A10
- the sheet E10 is disposed on the sheet D10
- the sheet C10 is disposed on the sheet B10
- the sheet F10 is disposed on the sheet D10.
- a liquid nitrogen container for heat insulation evaluation in which 30 layers of airgel laminates were laminated was obtained.
- seat was affixed with the aluminum tape.
- FIG. 4 is a cross-sectional view schematically showing the structure of a liquid nitrogen container for heat insulation evaluation in which the heat insulating material 20 is wound around the liquid nitrogen container 22.
- a heat insulating material 20 composed of a 30-layer airgel laminate is laminated on a liquid nitrogen container 22 having an inlet 21 so as to cover the outer periphery.
- Thermal insulation performance Thermal insulation performance was measured using a liquid nitrogen container for thermal insulation evaluation.
- FIG. 5 the schematic of a heat insulation performance test apparatus is shown. First, the liquid nitrogen container 22 around which the heat insulating material 20 was wound was placed in a thermostatic chamber 24 set to 283K and installed in the vacuum container 26. Next, the vacuum evacuation in the vacuum vessel 26 was performed by the turbo molecular pump 30, and the vacuum pressure in the vacuum vessel 26 was measured by the Pirani vacuum gauge 32 and the ion vacuum gauge 34.
- the vacuum pressure was measured with the ion vacuum gauge 34, and the pressure in the vacuum vessel 26 was 1 Vacuum evacuation was performed for 7 days until the pressure reached 10 ⁇ 2 Pa or less. Then, after injecting liquid nitrogen into the liquid nitrogen container 22 installed in the vacuum container 26, the temperature of the neck pipe 28 and the flow rate of the evaporated nitrogen gas are substantially constant values, and it is confirmed that the steady state is obtained.
- the heat flux q passing through the heat insulating material 20 was calculated.
- the evaporative gas mass flow rate m (kg / s) of liquid nitrogen was obtained from the following formula (I).
- ⁇ g, T represents a room temperature gas density (kg / m 3 )
- V g represents a room temperature gas flow rate (m 3 / s)
- the output of the wet flow meter 36 and the wet flow meter It is a value measured by the temperature inside 36.
- the efficiency ⁇ was obtained from the following formula (IV).
- C p (J / (kg ⁇ K)) represents specific heat.
- the value of the A s, a 0.243 ⁇ 10 -4 (m 2) the value of the L is 199000 (J / kg).
- the heat flux q (W / m 2 ) passing through the airgel laminate was determined from the following formula (V). The heat flux was measured three times, and the average value was used as the heat flux of this evaluation.
- a r (m 2 ) represents the surface area of the liquid nitrogen container, and the value is 0.2041 (m 2 ).
- Table 1 shows the layer structure and the heat insulation evaluation of the airgel laminate obtained in each example.
- SYMBOLS 1 Airgel layer, 2 ... Support body, 10 ... Airgel laminated body, 11 ... Core, 12 ... Rotary roll, 14 ... Cleaning tank, 16 ... Rotary roll, 18 ... Drying furnace, 20 ... Heat insulating material, 21 ... Inlet 22 ... Liquid nitrogen container, 24 ... Constant temperature bath, 26 ... Vacuum container, 27 ... Flange, 28 ... Neck piping, 30 ... Turbo molecular pump, 32 ... Pirani vacuum gauge, 34 ... Ion vacuum gauge, 36 ... Wet flow meter, 100 ... Airgel laminated roll, 100a ... Wet gel laminated body.
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Abstract
Description
本実施形態のエアロゲル積層ロールは、円筒状の巻芯と、当該巻芯にロール状に巻き付けられた厚み200μm以下のエアロゲル積層体と、を備える。
本実施形態に係るエアロゲル積層体は、支持体上に厚み200μm以下のエアロゲル層が積層された構造を備える。該エアロゲル層は、可とう性に優れており、従来、取扱い性が困難であったエアロゲルのシート化が可能となり、支持体と一体化できるため、エアロゲル積層体10は、円筒状の巻芯に巻き取って取り扱うことができる。
本実施形態に係るエアロゲル層は、エアロゲルにより構成されるものである。狭義には、湿潤ゲルに対して超臨界乾燥法を用いて得られた乾燥ゲルをエアロゲル、大気圧下での乾燥により得られた乾燥ゲルをキセロゲル、凍結乾燥により得られた乾燥ゲルをクライオゲルと称するが、本実施形態においては、湿潤ゲルのこれらの乾燥手法によらず、得られた低密度の乾燥ゲルをエアロゲルと称する。すなわち、本実施形態においてエアロゲルとは、広義のエアロゲルである「Gel comprised of a microporous solid in which the dispersed phase is a gas(分散相が気体である微多孔性固体から構成されるゲル)」を意味するものである。一般的にエアロゲルの内部は網目状の微細構造となっており、2~20nm程度のエアロゲル粒子が結合したクラスター構造を有している。このクラスターにより形成される骨格間には、100nmに満たない細孔があり、三次元的に微細な多孔性の構造をしている。なお、本実施形態におけるエアロゲルは、シリカを主成分とするシリカエアロゲルである。シリカエアロゲルとしては、例えば、メチル基等の有機基又は有機鎖を導入した、いわゆる有機-無機ハイブリッド化されたシリカエアロゲルが挙げられる。エアロゲル層は、ポリシロキサン由来の構造を有するエアロゲルを含有する層であってもよい。
本実施形態に係るエアロゲルは、支柱部及び橋かけ部を備えるラダー型構造を有するエアロゲルであり、かつ、橋かけ部が下記一般式(2)で表される構造を有するエアロゲルであってもよい。エアロゲルの骨格中にこのようなラダー型構造を導入することにより、耐熱性及び機械的強度を向上させることができる。なお、本実施形態において「ラダー型構造」とは、2本の支柱部(struts)と支柱部同士を連結する橋かけ部(bridges)とを有するもの(いわゆる「梯子」の形態を有するもの)である。本態様において、エアロゲル骨格がラダー型構造からなっていてもよいが、エアロゲルが部分的にラダー型構造を有していてもよい。
本実施形態に係るエアロゲルは、分子内に反応性基を有するポリシロキサン化合物及び該ポリシロキサン化合物の加水分解生成物からなる群より選択される少なくとも一種(以下、これらを総称して「ポリシロキサン化合物等」という場合がある)を含有するゾルから生成された湿潤ゲルを乾燥して得られるものであってもよい。すなわち、エアロゲル層は、分子内に反応性基を有するポリシロキサン化合物及び該ポリシロキサン化合物の加水分解生成物からなる群より選択される少なくとも一種を含有するゾルから生成された湿潤ゲルを乾燥してなる層から構成されていてもよい。なお、これまで述べてきたエアロゲルも、このように分子内に反応性基を有するポリシロキサン化合物及び該ポリシロキサン化合物の加水分解生成物からなる群より選択される少なくとも一種を含有するゾルから生成された湿潤ゲルを乾燥することで得られるものであってもよい。本実施形態に係るエアロゲル層は、分子内に反応性基を有するポリシロキサン化合物及び該ポリシロキサン化合物の加水分解生成物からなる群より選択される少なくとも一種を含有するゾルに由来する湿潤ゲルを乾燥してなる層であってもよい。本実施形態に係るエアロゲルは、上記ゾルに由来する三次元網目構造を有することができる。
本実施形態に係るエアロゲルは、シリカ粒子を含有するゾルから生成された湿潤ゲルを乾燥して得られるものであってもよい。すなわち、エアロゲル層は、シリカ粒子を含有するゾルから生成された湿潤ゲルを乾燥してなる層で構成されていてもよい。該エアロゲル層は、シリカ粒子が複合化された層である。なお、これまで述べてきたエアロゲルも、このように、シリカ粒子を含有するゾルから生成された湿潤ゲルを乾燥することで得られるものであってもよい。
本実施形態に係るエアロゲル層は、ポリシロキサン由来の構造を有するエアロゲルを含有する層で構成されていてもよい。ポリシロキサン由来の構造としては、例えば、上記一般式(1)、(2)、(3)、(6)、(7)又は(8)で表される構造が挙げられる。よって、本実施形態に係るエアロゲルは、シリカ粒子を含有せずに、上記一般式(6)、(7)及び(8)で表される構造のうち、少なくとも一種を有するものであってもよい。
本実施形態に係る支持体は、非エアロゲル層であり、支持体の構成としては、特に限定されず、単層でも複層でも構わない。支持部材としては、例えば、フィルム状支持体、箔状支持体等が挙げられる。
本実施形態のエアロゲル積層体の製造方法は、支持体と、該支持体上に設けられた湿潤ゲル層と、を有する湿潤ゲル積層体を、ロールツーロール(roll to roll)方式で洗浄する工程を備える方法により製造することができる。本実施形態に係るエアロゲル積層体は、支持体と、該支持体上に設けられた厚み200μm以下のエアロゲル層と、を有する。
ゾル生成工程は、上述のシリコン化合物と、場合によりポリシロキサン化合物及び/又はシリカ粒子を含む溶媒とを混合し、加水分解反応を行った後、ゾルゲル反応を行い、半ゲル化のゾル塗液を得る工程である。本工程においては、加水分解反応を促進させるため、溶媒中にさらに酸触媒を添加してもよい。また、特許第5250900号に示されるように、溶媒中に界面活性剤、熱加水分解性化合物等を添加することもできる。さらに、ゲル化反応を促進させるため、塩基触媒を添加してもよい。なお、本工程、後述する湿潤ゲル生成工程における工程時間を短縮し、加熱及び乾燥温度を低温化する観点から、ゾル中にシリカ粒子を含有するとよい。
湿潤ゲル生成工程は、上記ゾル生成工程で得られた半ゲル化状態のゾル塗液を、支持体に塗工してゲル化させてゲル層を形成する塗工工程と、ゲル層を熟成して湿潤ゲル層を形成する熟成工程からなる。具体的には、上記ゾル塗液を、支持体に塗布し、乾燥することによりゾル塗液をゲル化させてゲル層を支持体の表面に形成する。ただし、このゲル層は、支持体との接着力が確保される状態であることが望ましい。
洗浄工程は、上記湿潤ゲル生成工程により得られた湿潤ゲル積層体をロールツーロール方式で洗浄する工程(洗浄工程)である。湿潤ゲル積層体がロール状に巻き取られている場合には、巻き出されて洗浄される。洗浄工程では、後述する乾燥工程に適した溶媒に置換する工程(溶媒置換工程)を更に有していてもよい。洗浄及び溶媒置換手法は特に制限はされない。洗浄及び溶媒置換工程は、湿潤ゲル積層体を洗浄する工程を行わず、溶媒置換工程のみを行う形態でも実施可能であるが、湿潤ゲル層中の未反応物、副生成物等の不純物を低減し、より純度の高いエアロゲル積層体の製造を可能にする観点からは、熟成後の湿潤ゲル層を洗浄してもよい。洗浄工程をロールツーロール方式で行うことができるため、エアロゲル積層体の製造工程、製造時間等を短縮することができため、生産性に優れている。
乾燥工程では、上記の通り洗浄及び(必要に応じ)溶媒置換された湿潤ゲル層を有する湿潤ゲル積層体を乾燥させる。これにより、最終的なエアロゲル積層体を得ることができる。
[ゾル塗液1]
水を2000.0質量部、酸触媒として酢酸を1.00質量部、カチオン系界面活性剤として臭化セチルトリメチルアンモニウムブロミド(和光純薬工業株式会社製、以下、「CTAB」と略記)を200.0質量部及び熱加水分解性化合物として尿素を1200.0質量部混合し、これにシリコン化合物としてメチルトリメトキシシラン(信越化学工業株式会社製、製品名:KBM-13、以下「MTMS」と略記)を600.0質量部及びジメチルジメトキシシラン(信越化学工業株式会社製、製品名:KBM-22、以下「DMDMS」と略記)を400.0質量部加え、25℃で2時間反応させた。その後、60℃で5時間ゾルゲル反応させてゾル塗液1を得た。
上記ゾル塗液1を、支持体である(縦)30m×(横)600mm×(厚)12μmの両面アルミニウム蒸着PETフィルム(日立AIC株式会社製、製品名:VM-PET)に、ゲル化後の厚みが40μmとなるようにコンマコータを用いて塗布し、60℃で5分乾燥して、巻芯に巻き取ることで、ロール状の湿潤ゲル積層体を得た。その後、得られた湿潤ゲル積層体を乾燥機で、60℃で8時間熟成した。
[ゾル塗液2]
水を2000.0質量部、酸触媒として酢酸を1.00質量部、カチオン系界面活性剤としてCTABを200.0質量部及び熱加水分解性化合物として尿素を1200.0質量部混合し、これにシリコン化合物としてMTMSを800.0質量部及びポリシロキサン化合物として上記一般式(5)で表される構造を有する両末端2官能アルコキシ変性ポリシロキサン化合物(以下、「ポリシロキサン化合物A」という)を200.0質量部加え、25℃で2時間反応させた。その後、60℃で5時間ゾルゲル反応させてゾル塗液2を得た。
上記ゾル塗液2を用いて、実施例1と同様にして、上記一般式(2)、(3)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール2を得た。
[ゾル塗液3]
水を2000.0質量部、酸触媒として酢酸を1.00質量部、カチオン系界面活性剤としてCTABを200.0質量部及び熱加水分解性化合物として尿素を1200.0質量部混合し、これにシリコン化合物としてMTMSを600.0質量部及びポリシロキサン化合物として上記一般式(5)で表される構造を有する両末端3官能アルコキシ変性ポリシロキサン化合物(以下、「ポリシロキサン化合物B」という)を400.0質量部加え、25℃で2時間反応させた。その後、60℃で2時間ゾルゲル反応させてゾル塗液6を得た。
上記ゾル塗液3を用いて、実施例1と同様にして、上記一般式(2)及び(6)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール3を得た。
[ゾル塗液4]
シリカ粒子含有原料としてPL-2L(扶桑化学工業株式会社製、製品名、平均1次粒子径:20nm、固形分:20質量%)を1000.0質量部、水を1000.0質量部、酸触媒として酢酸を1.00質量部、カチオン系界面活性剤としてCTABを200.0質量部及び熱加水分解性化合物として尿素を1200.0質量部混合し、これにシリコン化合物としてMTMSを600.0質量部及びDMDMSを200.0質量部、並びにポリシロキサン化合物としてX-22-160AS(信越化学工業株式会社製、製品名)を200.0質量部加え、25℃で2時間反応させた。その後、60℃で1.0時間ゾルゲル反応させてゾル塗液4を得た。
上記ゾル塗液4を用いて、実施例1と同様にして、上記一般式(1)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール4を得た。
[ゾル塗液5]
シリカ粒子含有原料としてPL-2Lを1000.0質量部、水を1000.0質量部、酸触媒として酢酸を1.00質量部、カチオン系界面活性剤としてCTABを200.0質量部及び熱加水分解性化合物として尿素を1200.0質量部混合し、これにシリコン化合物としてMTMSを600.0質量部及びDMDMSを200.0質量部、並びにポリシロキサン化合物としてポリシロキサン化合物Aを20.0質量部加え、25℃で2時間反応させた。その後、60℃で1.0時間ゾルゲル反応させてゾル塗液9を得た。
上記ゾル塗液5を用いて、実施例1と同様にして、上記一般式(2)、(3)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール5を得た。
[ゾル塗液6]
シリカ粒子含有原料としてPL-2Lを1000.0質量部、水を1000.0質量部、酸触媒として酢酸を1.00質量部、カチオン系界面活性剤としてCTABを200.0質量部及び熱加水分解性化合物として尿素を1200.0質量部混合し、これにシリコン化合物としてMTMSを600.0質量部及びDMDMSを200.0質量部、並びにポリシロキサン化合物としてポリシロキサン化合物Bを200.0質量部加え、25℃で2時間反応させた。その後、60℃で1.0時間ゾルゲル反応させてゾル塗液10を得た。
上記ゾル塗液6を用いて、実施例1と同様にして、上記一般式(2)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール6を得た。
[エアロゲル積層ロール7]
ゲル化後の厚みを20μmに変更した以外は、実施例5と同様にして、上記一般式(2)、(3)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール7を得た。
[エアロゲル積層ロール8]
ゲル化後の厚みを100μmに変更した以外は、実施例5と同様にして、上記一般式(2)、(3)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール8を得た。
[エアロゲル積層ロール9]
ゲル化後の厚みを150μmに変更した以外は、実施例5と同様にして、上記一般式(2)、(3)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール9を得た。
[エアロゲル積層ロール10]
ロール状の湿潤ゲル積層体を、600Lの水を含む第1の槽、600Lのメタノールを含む第2の槽1、600Lのメタノールを含む第3の槽及び600Lのメチルエチルケトンを含む第4の槽の順に通過させながらロールツーロール方式で洗浄した以外は、実施例5と同様にして上記一般式(2)、(3)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール10を得た。
[エアロゲル積層ロール11]
湿潤ゲル積層体をロール状に巻き取った際に、ゲル層の支持体側と反対の面に、セパレーター(大紀商事製、製品名:OKILON-Sha2520)を積層した以外は、実施例5と同様にして上記一般式(2)、(3)、(6)及び(7)で表される構造を有するエアロゲル積層体を備えるエアロゲル積層ロール11を得た。
各実施例で得られたエアロゲル積層ロールについて、以下の条件に従い、測定又は評価をした。
エアロゲル積層ロールを、(縦)606mm×(横)343mmのシートA、(縦)612mm×(横)362mmのシートB、(縦)618mm×(横)380mmのシートC、(直径)105mmのシートD、(直径)112mmのシートE、(直径)118mmのシートFのサイズにそれぞれ加工した。
液体窒素容器22の外周に設けられた断熱材20の総厚みD30(mm)を、次式より算出した。
D30=Dc/2―50.0
式中、Dc(mm)は、エアロゲル積層体を30層巻き付けた後の液体窒素容器の直径を示す。
断熱性評価用の液体窒素容器を用いて、断熱性能を測定した。図5に、断熱性能試験装置の概略図を示す。まず、断熱材20が巻き付けられた液体窒素容器22を283Kに設定した恒温槽24に入れ、真空容器26内に設置した。次に、真空容器26内の真空排気をターボ分子ポンプ30で行い、真空容器26内部の真空圧力をピラニー真空計32及びイオン真空計34で計測した。ターボ分子ポンプ30を運転して、ピラニー真空計32が4×10-1Pa以下の真空圧力を示したのを確認後、イオン真空計34で真空圧力を計測し、真空容器26の圧力が1×10-2Pa以下になるまで、7日間真空排気を行った。その後、真空容器26内に設置された液体窒素容器22に液体窒素を注液後、首配管28の温度と蒸発した窒素ガス流量がほぼ一定値であり、定常状態であることを確認したときの、断熱材20を通過する熱流束qを算出した。
Claims (9)
- 支持体と、該支持体上に設けられた厚み200μm以下のエアロゲル層と、を有するエアロゲル積層体の製造方法であって、
前記支持体と、該支持体上に設けられた湿潤ゲル層と、を有する湿潤ゲル積層体を、ロールツーロール方式で洗浄する工程を備える、エアロゲル積層体の製造方法。 - 前記湿潤ゲル層の厚みが、400μm以下である、請求項1に記載のエアロゲル積層体の製造方法。
- 前記エアロゲル層が、ポリシロキサン由来の構造を有するエアロゲルを含有する層である、請求項1又は2に記載のエアロゲル積層体の製造方法。
- 前記湿潤ゲルが、分子内に反応性基を有するポリシロキサン化合物及び該ポリシロキサン化合物の加水分解生成物からなる群より選択される少なくとも一種を含有するゾルから生成されたゲルを含有する、請求項1~3のいずれか一項に記載のエアロゲル積層体の製造方法。
- 前記湿潤ゲル層が、シリカ粒子を含有するゾルから生成されたゲルを含有する、請求項1~4のいずれか一項に記載のエアロゲル積層体の製造方法。
- 支持体と、該支持体上に設けられた厚み200μm以下のエアロゲル層と、を有するエアロゲル積層体を巻芯に巻きあげてなる、エアロゲル積層ロール。
- 前記エアロゲル層が、ポリシロキサン由来の構造を有するエアロゲルを含有する層である、請求項6に記載のエアロゲル積層ロール。
- 前記エアロゲル層が、分子内に反応性基を有するポリシロキサン化合物及び該ポリシロキサン化合物の加水分解生成物からなる群より選択される少なくとも一種を含有するゾルから生成された湿潤ゲルを乾燥してなる層である、請求項6又は7に記載のエアロゲル積層ロール。
- 前記エアロゲル層が、シリカ粒子を含有するゾルから生成された湿潤ゲルを乾燥してなる層である、請求項6~8のいずれか一項に記載のエアロゲル積層ロール。
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- 2016-01-27 JP JP2016572090A patent/JP6508223B2/ja active Active
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- 2016-01-27 US US15/546,700 patent/US10556405B2/en active Active
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JP2018118489A (ja) * | 2017-01-27 | 2018-08-02 | 日立化成株式会社 | エアロゲル積層複合体及び断熱材 |
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WO2019070035A1 (ja) * | 2017-10-04 | 2019-04-11 | 日立化成株式会社 | エアロゲル複合体パウダー及び撥水材 |
JP2019064892A (ja) * | 2017-10-04 | 2019-04-25 | 日立化成株式会社 | エアロゲル複合体パウダー及び撥水材 |
CN112897532A (zh) * | 2019-11-19 | 2021-06-04 | 吉林建筑大学 | 一种二氧化硅气凝胶粉体及其制备方法和应用 |
CN112897532B (zh) * | 2019-11-19 | 2022-09-20 | 吉林建筑大学 | 一种二氧化硅气凝胶粉体及其制备方法和应用 |
Also Published As
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CN107206760A (zh) | 2017-09-26 |
US10556405B2 (en) | 2020-02-11 |
US20180009199A1 (en) | 2018-01-11 |
CN107206760B (zh) | 2020-05-15 |
US11117353B2 (en) | 2021-09-14 |
JP6508223B2 (ja) | 2019-05-08 |
JPWO2016121798A1 (ja) | 2017-10-05 |
US20200130331A1 (en) | 2020-04-30 |
TW201634542A (zh) | 2016-10-01 |
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