WO2013121992A1 - Matériau d'isolation sous vide et son procédé de fabrication - Google Patents

Matériau d'isolation sous vide et son procédé de fabrication Download PDF

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Publication number
WO2013121992A1
WO2013121992A1 PCT/JP2013/052992 JP2013052992W WO2013121992A1 WO 2013121992 A1 WO2013121992 A1 WO 2013121992A1 JP 2013052992 W JP2013052992 W JP 2013052992W WO 2013121992 A1 WO2013121992 A1 WO 2013121992A1
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Prior art keywords
inorganic fiber
strand
heat insulating
yarn
insulating material
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PCT/JP2013/052992
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English (en)
Japanese (ja)
Inventor
憲司 井前
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井前工業株式会社
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Priority to JP2013558669A priority Critical patent/JP6068369B2/ja
Priority to CN201380008960.6A priority patent/CN104105917B/zh
Publication of WO2013121992A1 publication Critical patent/WO2013121992A1/fr

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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4391—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece characterised by the shape of the fibres
    • D04H1/43912—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece characterised by the shape of the fibres fibres with noncircular cross-sections
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/559—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving the fibres being within layered webs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/065—Arrangements using an air layer or vacuum using vacuum

Definitions

  • the present invention relates to a vacuum heat insulating material used for a refrigerator, a cold storage, a heat storage, a water heater, and the like. More specifically, the laminate of inorganic fiber sheets manufactured by a wet papermaking method is vacuum-sealed with an outer packaging material. It is related with a vacuum heat insulating material and its manufacturing method.
  • a heat insulating material used for a refrigerator As a heat insulating material used for a refrigerator, a cold storage, a heat storage, a water heater, etc., a vacuum heat insulating material excellent in heat insulating properties is used.
  • a vacuum heat insulating material conventionally, a glass wool plate produced by pressurizing and compressing glass wool is stored in a container having excellent gas barrier properties, and the container is evacuated and sealed. (For example, JP-A-60-14695: Patent Document 1).
  • Glass wool generally has a large variation in fiber length.
  • glass wool produced by a centrifugal method, a flame method, or the like contains fine particles called shots (non-fibrous granules), and has a large particle size. Shots cause large pores in the heat insulating material, and if there are many shots in the air gaps of the heat insulating material, it is considered that the heat insulating property is deteriorated due to gas convection heat transfer in the container. ing.
  • shots cause large pores in the heat insulating material, and if there are many shots in the air gaps of the heat insulating material, it is considered that the heat insulating property is deteriorated due to gas convection heat transfer in the container. ing.
  • Patent Document 2 instead of a glass wool plate obtained by pressure-compressing glass wool, a laminate of inorganic fiber sheets obtained by wet-making glass fibers is used. Further, it has been proposed that the shot content contained in glass wool is 0.1% by mass or less as the inorganic fiber used as a raw material.
  • Patent Document 3-5 specifically, a non-woven fabric obtained by wet-making inorganic fibers having an average fiber diameter of 3-15 ⁇ m, an average fiber length of 3-15 mm, high straightness, and circular cross section is used as the inorganic fiber sheet. Has been proposed.
  • Japanese Patent Laid-Open No. 60-14695 JP 2005-265038 A Japanese Patent No. 4713566 Japanese Patent No. 4726970 Japanese Patent No. 4772887
  • Patent Documents 3-5 Since a chopped strand having a high straightness used as a raw material in Patent Documents 3-5 is less likely to be entangled with each other in a papermaking process, a binder is essential.
  • water-soluble polymers such as polyvinyl alcohol fibers and polyvinyl alcohol particles are used as a binder.
  • organic binders such as those described above volatilize gradually when exposed to high vacuum for a long period of time, and the degree of vacuum decreases due to the volatile components of the organic binder, resulting in a decrease in heat insulation properties of the vacuum heat insulating material over time.
  • patent document 3 before vacuum-sealing the core material, by removing the binder contained in the laminated nonwoven fabric, in patent document 5, by using a liquid binder as the binder (patent document 5), heat insulation by the binder Suppression of sex is suppressed.
  • Patent Documents 3-5 when inorganic fibers are used in a high vacuum state, the entanglement between the fibers is suppressed, and if the binder is reduced too much, the sheet shape of the inorganic fiber sheet is reduced. Holding becomes difficult. In addition, even if a binder removal process by heating etc. is added, when inorganic fiber sheets are stacked, it is difficult to remove the binder from the internal inorganic fiber sheet, and a new problem of increased cost of vacuum heat insulating material by adding a binder removal process Invite
  • the present invention has been made in view of the above circumstances, and the object of the present invention is to maintain the sheet shape even if the use of a binder that causes a problem of volatilization under vacuum is avoided.
  • An object of the present invention is to provide a vacuum heat insulating material with high quality stability that can maintain the initial heat insulating property over a long period of time.
  • the vacuum heat insulating material of the present invention is a vacuum heat insulating material comprising a laminate of inorganic fiber sheets and an outer packaging material obtained by vacuum-sealing the laminate, and the inorganic fiber sheet has a cut length (L) of 3 to 12 mm.
  • Inorganic fiber strand groups including curved inorganic fiber strands are randomly dispersed, and at least a part of the inorganic fiber strand groups are engaged with each other.
  • the curved inorganic fiber strand is preferably formed by cutting a filament shaped into a corrugated waveform at intervals of 3 mm to 12 mm so as to be 1/2 to 1 period of the corrugated shape.
  • the wave height (twice the amplitude) of the inorganic fiber strand is preferably 1 to 6 mm.
  • the inorganic fiber strand group comprises a bulky processed yarn composed of a multifilament core yarn and a multifilament sheath yarn entangled while forming loops and / or talmi on the surface of the core yarn. It is obtained by cutting at 12 mm, and the curved inorganic fiber strand is preferably obtained by cutting a multifilament constituting the sheath yarn, and the curved inorganic fiber strand has a length of It is preferably a strand having a loop or curve of 6 mm to 25 mm. Moreover, it is preferable that the multifilament which comprises the said core yarn is a cross-sectional deformed fiber.
  • the fiber diameter of the first inorganic fiber strand is preferably 0.5 to 15 ⁇ m, and the inorganic fiber strand is preferably glass fiber. Moreover, it is preferable that the content rate of the said curvilinear strand is 15% or more of the said whole inorganic fiber strand.
  • the inorganic fiber sheet is preferably obtained by wet-making the dispersion of the inorganic fiber strand.
  • the method for producing a vacuum heat insulating material according to the present invention is a method for producing a vacuum heat insulating material comprising a laminate of inorganic fiber sheets and an outer packaging material obtained by vacuum-sealing the laminate, and includes an inorganic fiber strand group and a dispersant.
  • a bulky processed yarn comprising a multifilament core yarn and a multifilament sheath yarn entangled while forming a loop and / or a talmi on the surface of the core yarn has a length of 3 mm to It is characterized by using an inorganic fiber strand cut by 12 mm, or by using an inorganic fiber strand having a wavelength of 1/2 to 1 cycle and a wavelength of 3 mm to 12 mm.
  • the vacuum heat insulating material of the present invention does not substantially contain a volatile component that lowers the degree of vacuum, it can maintain a high vacuum state for a long period of time, and stably provide excellent heat insulating properties. can do.
  • the manufacturing method of this invention is convenient as a manufacturing method of the vacuum heat insulating material of this invention, and is excellent in productivity.
  • the vacuum heat insulating material of the present invention is a vacuum heat insulating material comprising a laminated body 10 formed by laminating inorganic fiber sheets 1, 1... And an outer packaging material 11 obtained by vacuum-sealing the laminated body 10. It is a material.
  • inorganic fiber strand groups including curved inorganic fiber strands having a cut length (L) of 3 to 12 mm are randomly dispersed, and at least a part of the inorganic fiber strand groups are engaged with each other. It becomes a sheet shape.
  • the curved inorganic fiber strand may be obtained by cutting a waveform curve (two-dimensional curve) filament with a predetermined length, or a three-dimensional curve filament such as a spiral with a predetermined length. It may be obtained by cutting, or may be obtained by cutting a curved filament having a loop or a curve at a predetermined length at random.
  • a filament corrugated shaped yarn
  • a waveform consisting of a curve, cut at intervals of 3 mm to 12 mm so as to be 1/2 to 1 cycle of the waveform (derived from the corrugated shaped yarn)
  • a bulky processed yarn having a length of 3 to 12 mm, and a multifilament core yarn and a multifilament sheath yarn entangled while forming a loop and / or a slack on the surface of the core yarn. What was cut (strands derived from bulky processed yarn) can be mentioned.
  • the above-mentioned curvilinear strand should just be contained in the inorganic fiber strand group which comprises a sheet
  • the content of the curved strand depends on the type (size, shape, etc.) of the curved strand, but 15% or more, preferably 50% or more, more preferably 70% or more, more preferably all of the entire inorganic fiber strand. Is a curved strand.
  • inorganic fiber constituting the strand glass fiber, basalt fiber, silica fiber, ceramic fiber such as alumina fiber or the like can be used, and glass fiber is preferable.
  • a plurality of types of inorganic fibers may be used in combination.
  • a plurality of types of glass fibers having different compositions may be combined.
  • the average fiber diameter of the inorganic fiber strand is preferably 0.5 to 15 ⁇ m.
  • the rigidity of the inorganic fibers is increased, and the heat conduction between the inorganic fiber sheets is facilitated.
  • the thickness is less than 0.5 ⁇ m, the rigidity becomes too low and it tends to be difficult to exhibit the anchor function by the engagement of the fibers.
  • the low rigidity is utilized to facilitate mounting on a curve or the like, and in the range of 3 to 15 ⁇ m, the heat insulating performance can be further improved.
  • each is in the said range.
  • Waveform shaping yarn and manufacturing method thereof Waveform shaping yarn is obtained by shaping a waveform having a curve on a linear filament.
  • the waveform consisting of a curve means that it does not include a rectangular wave, a triangular wave, or the like consisting of a straight line. Further, it refers to a waveform formed by a two-dimensional curve (planar curve), meaning that a three-dimensional curve obtained by 1/2 to 1 rotation of the spiral is not included.
  • the shape of the waveform is not particularly limited, and is not limited to a sine wave, but can be any waveform drawn by various combinations of sin, cos, involute curves, and the like.
  • the filament constituting the wave shaping yarn it is preferable to use a multifilament.
  • the glass fiber multifilament is obtained by passing the fiber melt from the melting furnace through a nozzle having a number of holes constituting the multifilament.
  • the method of shaping the waveform on the linear filament is not particularly limited, but when the inorganic fiber is glass fiber, it can be performed by passing the long fiber filament between two gears.
  • a method of passing the linear filament 2 between the heated gears 3 and 3; as shown in FIG. 3, the linear filament 2 ′ melt-spun from the nozzle 4 is A method of passing between the gears 3 ′ and 3 ′ before cooling and solidification and then cooling; a method of heating the long fiber filament and passing between the gears, and the like.
  • the filaments 2 and 2 ′ that are linear are passed through the gears while being heated close to the melting temperature of the glass fiber, so that the linear filaments 2 and 2 ′ are become.
  • the shape of the gear used for waveform shaping is not particularly limited as long as the desired curved inorganic fiber strand can be obtained. Not only the shape of the gear but also the amplitude of the waveform curve in FIGS. 2 and 3 by adjusting the distance between the two gears (between 3-3 and 3′-3 ′), the filament feed speed, etc. , Can change the waveform.
  • gear to be used for example, in the gear as shown in FIG. 4, it is preferable to use 1 to 3 modules and a pitch of 3 to 12 mm. As a result, a waveform having a wavelength of 3 to 12 mm for a wavelength of 1/2 to 1 cycle can be shaped.
  • the curved inorganic fiber strand comprises the above-mentioned corrugated shaped yarn at intervals of 3 mm to 12 mm, preferably 4 to 9 mm, preferably 1/2 to 1 period of the corrugation. It can be obtained by cutting.
  • the cut length L is between AA (1/2 cycle) and BB (1 cycle) in FIG. Corresponds to the wavelength of the strand.
  • the cut position is not limited to the peak position of the peak and valley of the waveform, but can be cut every wavelength 1/2 to 1 period starting from an arbitrary position of the peak and valley.
  • the waveform may be from the peak of the trough portion to the peak of the peak portion (see FIG. 6A), or the trough portion of the waveform. Alternatively, the waveform may be only a peak (see FIG. 6B).
  • the waveform may include a peak and a valley (see FIG. 6C), or the half width of the valley or the peak on both sides of the valley or the peak. May be a waveform formed by connecting these waves (see FIG. 6D). In FIG.
  • a waveform indicated by a solid line is a strand portion, and a broken line is a reference portion for drawing the waveform.
  • most of them are curvilinear curvilinear strands, and their wavelengths are 1/2 to 1 period and 3 to 12 mm.
  • the cut length (wavelength) L is too short, it becomes difficult to produce an inorganic fiber sheet by papermaking.
  • the cut length (wavelength) L is long, the inorganic fiber strands are too long, the elasticity is lowered, and the curved shape tends to be difficult to maintain, which is not preferable.
  • the wave height H of the curved inorganic fiber strand is in the range of 1 to 2 times the amplitude depending on the position where 1/2 to 1 period of the continuous waveform is selected.
  • the curved inorganic fiber strand used in the present invention preferably has a waveform with an amplitude of 0.5 to 3 mm, more preferably 0.5 to 2 mm. Therefore, since the wave height H of the curved inorganic fiber strand has a wavelength corresponding to 1/2 to 1 period of the waveform, it is preferably in the range of 1 to 6 mm although it depends on the corresponding position of the waveform. More preferably, it is 1 to 4 mm.
  • the corrugated yarn is usually cut by bundling 10 to 100 corrugated yarns and cutting them to a predetermined length with a guillotine cutter or the like.
  • a strand group in which a plurality of inorganic fiber strands are usually bundled is obtained by cutting multifilament corrugated yarns at predetermined intervals. Since such a strand group is a strand group that can be dispersed individually one by one, individual inorganic fiber strands before being used for the production of the inorganic fiber sheet or in an appropriate process of the production of the inorganic fiber sheet. It is preferable to use them separated so that they can be separated.
  • the curvilinear strand group derived from the corrugated shaped yarn as the material of the inorganic fiber sheet, it is not limited to one aggregate of curvilinear strands having the same corrugation, wavelength, and wave height. You may use the inorganic fiber strand group which combined the multiple types of curvilinear strand which has a different waveform, a wavelength, and a wave height by changing the kind of waveform shaping thread
  • a group of inorganic fiber strands derived from a bulky processed yarn is obtained by cutting a bulky processed yarn composed of a multifilament core yarn and a multifilament sheath yarn entangled on the surface of the core yarn.
  • the assembly is a combination of linear strands and curved strands.
  • the linear strand refers to a strand having a high degree of straightness that can be distinguished from a curved strand in addition to a complete linear strand.
  • Bulky processed yarn and manufacturing method thereof Bulky processed yarn is, for example, as shown in FIG. 7, a multifilament yarn is used as a core yarn 6, and a multifilament sheath yarn 7 is formed around the core yarn 6. It is entangled while forming loops and tarmi. Further, the multifilaments constituting the core yarn and the multifilaments constituting the sheath yarn may be entangled while forming a loop or a talmi (not shown).
  • a bulky processed yarn for example, a so-called taslan processed yarn or bulky yarn called a bulky yarn obtained by subjecting a multifilament yarn to fluid turbulence treatment, a double covering machine, etc.
  • Fancy yarns are known that are manufactured by swirling a decorative yarn on the fabric.
  • Such a bulky processed yarn can be produced, for example, by the following method. That is, the fiber melt is passed from a melting furnace through a nozzle having a number of holes constituting a multifilament, and multifilament yarns serving as core yarns are extruded and aligned. A filament serving as a sheath yarn is extruded from another nozzle provided around the nozzle constituting the core yarn. A fluid (usually air) is blown onto the multifilament that becomes the sheath yarn, so that the multifilament yarn that becomes the core yarn is entangled while forming a loop or a tarmi.
  • a fluid turbulent nozzle so-called Taslan nozzle, from the viewpoint of forming a large number of minimum loops and tarmi.
  • a plurality of multifilament yarns may be simultaneously formed by subjecting them to fluid disturbance treatment and then drawing.
  • the degree of loops and talmi can be changed.
  • the inorganic fiber constituting the core yarn and the inorganic fiber constituting the sheath yarn may be the same type of inorganic fiber or different types of inorganic fiber.
  • the average fiber diameter (d 1 ) of the inorganic fibers constituting the core yarn and the average fiber diameter (d 2 ) of the inorganic fibers constituting the sheath yarn may be the same or different.
  • the average fiber diameter (d 2 ) of the second inorganic fibers constituting the sheath yarn is equal to or less than the average fiber diameter (d 1 ) of the first inorganic fibers constituting the core yarn (that is, d 2 ⁇ d 1 ). .
  • the filament used for the core yarn is not limited to a circular cross section, and may be a deformed filament such as a triangular cross section, a cross section star shape, a cross section Y shape, or a cross section C shape.
  • a deformed filament such as a triangular cross section, a cross section star shape, a cross section Y shape, or a cross section C shape.
  • the average fiber diameter of the inorganic fibers constituting the core yarn and the sheath yarn is preferably 0.5 to 15 ⁇ m.
  • the rigidity of the inorganic fibers is increased, and the heat conduction between the inorganic fiber sheets is facilitated.
  • the thickness is less than 0.5 ⁇ m, the rigidity becomes too low, and it tends to be difficult to exert an anchor function due to fiber entanglement.
  • the low rigidity is utilized to facilitate mounting on a curve or the like, and in the range of 3 to 15 ⁇ m, the heat insulating performance can be further improved.
  • Inorganic fiber strands derived from bulky processed yarns The bulky processed yarns as described above are cut into 3 to 12 mm, preferably 4 to 9 mm, to obtain inorganic fiber strands. 7 and 8, L is the cut length. Therefore, the length of the strand obtained from the core yarn is approximately equal to the cut length L, but the length of the curved strand obtained from the sheath yarn is longer than the cut length L. Specifically, although depending on the type of bulky processed yarn, when the bulky processed yarn is cut to a length of 3 mm to 12 mm, a linear strand having a length of 3 mm to 12 mm and a loop having a fiber length of 6 mm to 25 mm or A combination of curvilinear strands having a curve.
  • the inorganic fiber sheet is produced by wet-making a fiber dispersion (raw material liquid) obtained by stirring and releasing a fiber suspension containing an inorganic fiber strand group and a dispersant.
  • a fiber dispersion raw material liquid
  • a fiber suspension containing an inorganic fiber strand group and a dispersant.
  • the inorganic fiber strand group a strand group including a curved strand manufactured separately can be used, but it is manufactured by using a strand group derived from the wavy shaped yarn or a strand group derived from a bulky processed yarn. Convenient.
  • the proportion of the strands that are engaged with each other tends to be higher than when an aggregate of strands that are present independently is used, and the strength and stability of the sheet are increased.
  • a raw material liquid can be prepared by adding an inorganic fiber strand group and a dispersing agent to water as a dispersion medium, and stirring and separating.
  • a strand group obtained from a multifilament it is preferable to disaggregate into individual inorganic fiber strands at the stage of this stirring.
  • Stirring and disaggregation correspond to the beating process of paper manufacture and can be performed by a refiner or the like, but the processing conditions to the extent that the multifilament is disaggregated into individual fibers so that the glass fibers do not break ( It is preferable to set temperature, rotation speed, pressure, and the like.
  • the dispersing agent is blended so that the fiber strand group composed of multifilaments is easily disaggregated into individual fibers and can be stably dispersed in water in the stirring step described later.
  • the dispersant for example, a polyalkylene glycol fatty acid ester type nonionic surfactant or the like can be used.
  • the dispersing agent is not particularly limited, but it is usually preferable to mix 0.5 to 2 parts by mass with respect to 100 parts by mass of the fiber strand.
  • the fiber strand is unraveled from the core yarn and further comprises the sheath yarn and the core yarn.
  • the multifilament that has been separated will be disaggregated into individual fibers. Therefore, in the raw material liquid, a relatively straight straight fiber fiber having a fiber length of 3 to 12 mm derived from the core yarn, a fiber length of approximately 6 to 25 mm from the sheath yarn, a loop shape remains, a wave shape, etc. In other words, it is in a state in which curvilinear inorganic fiber strands that are in a state that has been so-called crimped are mixed.
  • the curve of the curved strand derived from the sheath yarn becomes like an anchor, and the linear strand derived from the core yarn and the curved strand derived from the sheath yarn are intertwined and physically connected. It is thought that they are dispersed. That is, the linear strand and the curved strand are dispersed in a fibrillated (branched) state.
  • a straight strand having a length of 3 mm to 12 mm and a curvilinear strand having a loop or a curve having a length of 6 mm to 25 mm were separately prepared and blended. It is considered possible to use a raw material liquid. However, in general, it is not easy in production to obtain a curvilinear strand having a length of about 6 to 25 mm, which is crimped, and the curvilinear strand and the linear strand that existed separately are made of glass. It is substantially difficult to entangle the fibers so as to be branched by stirring under conditions that do not break the fibers. For these reasons, it is meaningful to use a strand group derived from a bulky processed yarn.
  • curvilinear inorganic fiber strands are dispersed separately and those in which the strands are engaged with each other.
  • FIGS. 9A and 9B show a case where inorganic fiber strands having a wavelength of 1 ⁇ 2 period are entangled. ing.
  • the linear inorganic fiber strands 8 are curved inorganic fiber strands 9 as shown in FIG.
  • the linear strands can also engage with each other as part of the strand group.
  • a dispersion liquid of a group of inorganic fiber strands entangled in a branched shape, including a linear strand can be obtained. It becomes easy to obtain.
  • Such entanglement makes it possible to produce a thin-layer inorganic fiber sheet oriented in the plane direction as a whole without a binder.
  • the curved inorganic fiber strands or the curved inorganic fiber strands and the linear inorganic fiber strands are entangled with each other, so that it is possible to form a sheet without a binder.
  • an inorganic binder may be added and blended as necessary.
  • the inorganic binder those having adhesive properties such as colloidal silica and alumina sol, and those in which silica or alumina forms stable secondary particles in a chain shape, a bead shape, or a needle shape are preferably used.
  • the secondary particles are contained in the raw material liquid as a colloidal sol in which silica or alumina having a major axis of about 0.01 ⁇ m to 2 ⁇ m is dispersed in water.
  • Such an inorganic binder can be stably attached to the fiber surface, and can prevent scattering in vacuuming and scattering of the vacuum heat insulating material in the container.
  • the inorganic binder used in the present invention is different from short fibers and shots mixed in glass wool in that the inorganic binder is not easily spilled or scattered from the inorganic fiber sheet.
  • the content of the inorganic binder particles is preferably 2 parts by mass or less, more preferably 1 part by mass or less, and still more preferably 0.5 parts by mass or less with respect to 100 parts by mass of the inorganic fiber strand. .
  • the raw material solution prepared above is wet-made and made into a sheet.
  • the wet papermaking method (papermaking process) is not limited, but is performed by the following method, for example. Paper making is usually performed by a system combining a wire part and a dryer part.
  • the prepared raw material liquid is ejected from the stock inlet to the wire part, and while running on the wire, water flows out under the wire, dehydrates, and further sucks and dehydrates to form a hydrous web. To do.
  • the pressing part is pressed and dehydrated between the press roll and the felt, and the moisture is evaporated and dried by the dryer part to obtain an inorganic fiber sheet.
  • a known paper machine such as a long net paper machine, a short net paper machine, or an inclined wire type paper machine can be used.
  • the basis weight of the inorganic fiber sheet is preferably 30 to 600 g / m 2 . If it is less than 30 g / m ⁇ 2 >, since the influence of the thermal conductivity of gas will become large when the diameter of the space
  • the inorganic fiber sheet produced as described above for example, when a group of inorganic fiber strands derived from bulky processed yarn is used, as shown in FIG. 11, linear inorganic fiber strands 8 derived from core yarn, sheath yarns.
  • the inorganic binder 20 is attached to the surface of the linear inorganic fiber strands 8 and / or the curved inorganic fibers 9.
  • a sheet shape is formed.
  • the inorganic fiber sheet produced as described above most of the curved inorganic fiber strands constituting the sheet are randomly dispersed to form a plane. However, some of the curved inorganic fiber strands are entangled so as to crosslink between the planes or between the planes to be laminated. Such entanglement does not cross-link a plurality of layers because of the relationship with the wavelength of the curved inorganic fiber strand, and since the existence ratio is small, a decrease in heat insulation due to heat conduction due to entanglement is small. And the amount of binders required by entanglement can be reduced.
  • some inorganic fiber strands may exist so as to protrude from the plane, but in the case where a part of the strand protrudes from the surface of the inorganic fiber sheet due to the relationship with the wave height H of the curved inorganic fiber strand. Even if it exists, there is almost no thing which breaks through the some inorganic fiber sheet
  • inorganic fiber strands derived from bulky processed yarns not only curved strands but also linear strands are included.
  • the linear strands tend to be restrained from being oriented at an angle orthogonal to the plane direction by engagement with the curved strands.
  • the curvilinear strand is crimped, it is difficult to be oriented at an angle orthogonal to the plane direction, and the fiber longitudinal direction is oriented along the thickness direction. Therefore, even when linear strands or curved strands protrude from the surface of the inorganic fiber sheet, the inorganic fiber derived from the corrugated yarn is rarely broken through a plurality of laminated inorganic fiber sheets.
  • the effect of contributing to the reduction of the required binder amount is greater than the decrease in the heat insulating property due to the entanglement of the strands, protrusions, etc. it can.
  • a plurality of inorganic fiber sheets 1 produced as described above are laminated to obtain a laminate 10.
  • the laminate can be produced by simply laminating and compressing the inorganic fiber sheet.
  • a loop of the second inorganic fiber derived from the sheath yarn protruding from the surface of the inorganic fiber sheet and a part of the talmi can act as an anchor to the laminated inorganic fiber sheet.
  • Fibers that can be used as anchors conduct heat between the laminated inorganic fiber sheets, but generally enter into the gap between the laminated inorganic fiber sheets in contact with the laminated inorganic fiber sheets or as anchors. Therefore, a decrease in heat conduction and heat insulation due to this is not a problem.
  • the outer packaging material 11 is a bag made of a film excellent in gas barrier properties.
  • a film having excellent gas barrier properties an ethylene-vinyl alcohol copolymer resin film having excellent gas barrier properties, a metal vapor-deposited film such as aluminum, or a metal foil such as aluminum is usually used as an intermediate layer.
  • the laminated body 10 produced as described above is accommodated in a bag in which the three sides of the laminated film are closed, and after evacuation, the vacant side is closed by heat sealing and vacuum-sealed.
  • a getter agent such as a gas adsorbent or a moisture adsorbent may be enclosed in the outer package in addition to the laminate.
  • the vacuum heat insulating material having the above-described structure does not have an organic binder that volatilizes even when the degree of vacuum is high, and there are no fine particles or short fibers that scatter. Is possible.
  • the vacuum heat insulating material of the present invention does not contain organic binders and fine particles that volatilize and convect in the laminate constituting the heat insulating material body, so that the heat insulating property is less likely to deteriorate with time. Therefore, it is useful as a heat insulating material for equipment that requires high thermal insulation for a long period of time.
  • the production method of the present invention is useful as a method for producing the vacuum heat insulating material of the present invention.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonwoven Fabrics (AREA)
  • Thermal Insulation (AREA)
  • Paper (AREA)

Abstract

La présente invention se rapporte à un matériau d'isolation sous vide qui a une qualité stable, qui est capable de maintenir les propriétés d'isolation thermique initiales sur une longue période de temps et qui est capable de maintenir la forme d'une feuille, même lorsqu'on ne recourt pas à l'utilisation d'un liant, ce qui provoque un problème de volatilisation dans un état sous vide. Le matériau d'isolation sous vide selon la présente invention comprend un corps stratifié (10) de feuilles de fibres inorganiques (1) et un élément enveloppant (11) qui permet de sceller sous vide le corps stratifié. Dans les feuilles à fibre inorganique, les groupes de brins de fibre inorganique qui contiennent des brins de fibres inorganiques incurvés ayant une longueur coupée (L) comprise entre 3 mm et 12 mm sont répartis de manière aléatoire et au moins certains des groupes de brins de fibres inorganiques sont en prise les uns avec les autres.
PCT/JP2013/052992 2012-02-14 2013-02-08 Matériau d'isolation sous vide et son procédé de fabrication WO2013121992A1 (fr)

Priority Applications (2)

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JP2013558669A JP6068369B2 (ja) 2012-02-14 2013-02-08 真空断熱材及びその製造方法
CN201380008960.6A CN104105917B (zh) 2012-02-14 2013-02-08 真空绝热材料及其制造方法

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JP2012-029321 2012-02-14
JP2012029321 2012-02-14

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WO2014162771A1 (fr) * 2013-04-05 2014-10-09 三菱電機株式会社 Matériau thermoisolant sous vide, cuve d'isolation thermique pourvue de ce dernier, isolant thermique, et chauffage à eau chaude de pompe à chaleur
JP2016035320A (ja) * 2013-11-26 2016-03-17 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 真空断熱材、断熱箱体及び冷蔵庫
WO2018087983A1 (fr) 2016-11-10 2018-05-17 三菱電機株式会社 Matériau d'isolation thermique sous vide, procédé de production de matériau d'isolation thermique sous vide et appareil de production de matériau d'isolation thermique sous vide
WO2022009851A1 (fr) * 2020-07-10 2022-01-13 イビデン株式会社 Feuille de suppression de transfert de chaleur et bloc-batterie
JP2023098550A (ja) * 2021-12-28 2023-07-10 イビデン株式会社 熱伝達抑制シート及び組電池

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JPH09229290A (ja) * 1996-02-28 1997-09-05 Mitsubishi Chem Corp 真空断熱材用複合材および真空断熱材の製造方法
JP2004052774A (ja) * 2002-05-31 2004-02-19 Matsushita Refrig Co Ltd 真空断熱材、およびそれを用いた冷凍機器、冷温機器、ならびに真空断熱材芯材とその製造方法
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WO2014162771A1 (fr) * 2013-04-05 2014-10-09 三菱電機株式会社 Matériau thermoisolant sous vide, cuve d'isolation thermique pourvue de ce dernier, isolant thermique, et chauffage à eau chaude de pompe à chaleur
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JP2016035320A (ja) * 2013-11-26 2016-03-17 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 真空断熱材、断熱箱体及び冷蔵庫
WO2018087983A1 (fr) 2016-11-10 2018-05-17 三菱電機株式会社 Matériau d'isolation thermique sous vide, procédé de production de matériau d'isolation thermique sous vide et appareil de production de matériau d'isolation thermique sous vide
JP6359206B1 (ja) * 2016-11-10 2018-07-18 三菱電機株式会社 真空断熱材、真空断熱材の製造方法、及び真空断熱材の製造装置
WO2022009851A1 (fr) * 2020-07-10 2022-01-13 イビデン株式会社 Feuille de suppression de transfert de chaleur et bloc-batterie
JP6997263B1 (ja) 2020-07-10 2022-01-17 イビデン株式会社 熱伝達抑制シート及び組電池
JP7000626B1 (ja) 2020-07-10 2022-01-19 イビデン株式会社 熱伝達抑制シート及び組電池
JP2022025133A (ja) * 2020-07-10 2022-02-09 イビデン株式会社 熱伝達抑制シート及び組電池
JP2022024233A (ja) * 2020-07-10 2022-02-09 イビデン株式会社 熱伝達抑制シート及び組電池
JP2022037091A (ja) * 2020-07-10 2022-03-08 イビデン株式会社 熱伝達抑制シートの製造方法及び組電池の製造方法
JP7044939B2 (ja) 2020-07-10 2022-03-30 イビデン株式会社 熱伝達抑制シートの製造方法及び組電池の製造方法
JP2023098550A (ja) * 2021-12-28 2023-07-10 イビデン株式会社 熱伝達抑制シート及び組電池

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JPWO2013121992A1 (ja) 2015-05-11
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