US20190177911A1 - Heat insulator - Google Patents

Heat insulator Download PDF

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Publication number
US20190177911A1
US20190177911A1 US16/198,236 US201816198236A US2019177911A1 US 20190177911 A1 US20190177911 A1 US 20190177911A1 US 201816198236 A US201816198236 A US 201816198236A US 2019177911 A1 US2019177911 A1 US 2019177911A1
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United States
Prior art keywords
resin
heat insulator
composite layer
nonwoven fabric
lipophilic
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Abandoned
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US16/198,236
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English (en)
Inventor
Hirohisa Hino
Taichi Nakamura
Kazuma Oikawa
Shigeaki Sakatani
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. reassignment PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OIKAWA, KAZUMA, NAKAMURA, TAICHI, SAKATANI, SHIGEAKI, HINO, HIROHISA
Publication of US20190177911A1 publication Critical patent/US20190177911A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/77—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
    • D06M11/79—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0059—Organic ingredients with special effects, e.g. oil- or water-repellent, antimicrobial, flame-resistant, magnetic, bactericidal, odour-influencing agents; perfumes
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    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/04—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by at least one layer folded at the edge, e.g. over another layer ; characterised by at least one layer enveloping or enclosing a material
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    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/507—Polyesters
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
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    • D06M15/55—Epoxy resins
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
    • D06N3/0011—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using non-woven fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2255/26—Polymeric coating
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    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
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    • D—TEXTILES; PAPER
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    • D06M2400/00—Specific information on the treatment or the process itself not provided in D06M23/00-D06M23/18
    • D06M2400/02—Treating compositions in the form of solgel or aerogel
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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Definitions

  • the present disclosure relates to a heat insulator, particularly to a heat insulator having a surface coating film.
  • a user of a mobile device usually holds and operates the device with a hand for certain lengths of time. It is accordingly important for a mobile device to keep low surface temperature.
  • a method is available that prevents temperature increase of a mobile device surface with a heat insulator installed directly above a heat generating component of a mobile device.
  • Silica aerogel one of many heat insulators currently available, is a material having high heat insulating performance.
  • Silica aerogel is known as a nanoporous material having a porosity of 90% or more. In terms of aging and heat resistance, silica aerogel is more desirable than other heat insulators, and has a desirable thermal conductivity of about 15 mW/m ⁇ K. However, silica aerogel lacks high mechanical strength because of its network structure of fine point-contact silica particles of several tens of nanometers. In order to overcome the weakness of silica aerogel, Oikawa et al. has proposed to improve strength by forming a sheet of silica aerogel with other materials such as a fiber, a nonwoven fabric, and a resin.
  • the network structure of fine silica aerogel particles is intrinsically weak, and there are cases where the individual particles break away from the network structure of silica aerogel. These free silica aerogel particles float inside a mobile device, and cause malfunctions in the device.
  • a common approach to preventing this drawback is to enclose and pack a silica aerogel composite sheet by covering it with laminate films (hereinafter, referred to as “laminate packing”), as disclosed in, for example, Japanese Patent Number 6064149.
  • Laminate packing is essentially a custom-made process made to individual shapes and sizes, and greatly increases cost. This pushes up the cost of the product mobile device, and the product loses some competitiveness in the market.
  • the present disclosure is intended to provide a solution to the foregoing problem of related art, and it is an object of the present disclosure to provide a silica aerogel-containing heat insulator without using laminate packing.
  • a heat insulator that includes: a composite layer having silica aerogel enclosed in a nonwoven fabric; and a coating film containing a hydrophilic resin and a lipophilic resin and coating a surface of the composite layer.
  • a protective film can be formed on the silica aerogel composite layer by applying a coating material to a surface of the silica aerogel composite layer, regardless of the shape of the coating applied portion.
  • the film has high adhesion, and can provide a heat insulator having excellent heat insulation.
  • a device using such a heat insulator, and a method for forming a coating structure for such a heat insulator also can be provided.
  • FIG. 1A is a cross sectional view of a heat insulator formed by applying a coating material of an embodiment.
  • FIG. 1B is a plan view of a coating film of the embodiment.
  • FIG. 2 is a diagram showing an appearance of the coating film of the embodiment.
  • FIG. 1A shows a cross section of a heat insulator 110 with an applied coating according to an embodiment.
  • FIG. 1B is a plan view of a coating film of the embodiment.
  • FIG. 2 is a diagram showing an appearance of the coating film of the embodiment.
  • Heat insulator 110 has a structure in which coating film 111 is formed around composite layer 102 of nonwoven fabric 106 and silica aerogel 105 .
  • the fibers of nonwoven fabric 106 sticking out of composite layer 102 are adhering to hydrophilic resin 112 and reactive lipophilic resin 113 in coating film 111 .
  • Composite layer 102 is a sheet enclosing silica aerogel 105 of a nanosize porous structure in the nonwoven fabric 106 having a thickness of 0.05 to 1.0 mm.
  • the thermal conductivity is 0.01 to 0.1 W/m ⁇ K.
  • the thermal conductivity of nonwoven fabric 106 is typically 0.030 to 0.060 W/m ⁇ K, and this value can be regarded as about the same as the sum of the thermal conductivity of the solid component of nonwoven fabric 106 , and the thermal conductivity of the air (nitrogen molecules) component present in the spaces of the nonwoven fabric.
  • the low thermal conductivity specified above can be achieved by enclosing silica aerogel 105 as a low thermal conductivity material having a commonly agreed thermal conductivity of 0.010 to 0.015 W/m ⁇ K—in these spaces.
  • the thermal conductivity of still air at ordinary temperature is said to be typically about 0.026 W/m ⁇ K, and a value thereof is smaller than the thermal conductivity of nonwoven fabric 106 .
  • a characteristic of composite layer 102 is that it is a sheet having a smaller thermal conductivity than still air.
  • Composite layer 102 has water repellency and sound absorbability, in addition to heat insulation. Composite layer 102 also can be imparted with heat resistance and flame retardancy by appropriately selecting the type of nonwoven fabric 106 .
  • an oxidized acryl is used as nonwoven fabric 106 to impart heat resistance and flame retardancy. It is, however, possible to use glass fiber paper.
  • Composite layer 102 used in the present embodiment has a thermal conductivity of 0.01 to 0.1 W/m ⁇ K.
  • the heat insulating effect of composite layer 102 increases as the thermal conductivity becomes smaller, and the thickness needed for composite layer 102 to show the same heat insulating effect can be reduced when the thermal conductivity is smaller.
  • the heat insulating effect becomes smaller when the thermal conductivity increases above 0.1 W/m ⁇ K. This is not desirable as it necessitates thicker composite layer 102 to obtain the necessary heat insulating effect.
  • Composite layer 102 has a thickness of 0.05 mm to 2 mm, preferably 0.5 mm to 1 mm.
  • the heat insulating effect becomes small in thickness direction, and the heat conduction across the thickness from one side to the other side of the layer cannot be desirably reduced unless a low heat conductive material of extremely low thermal conductivity (even lower than the lowest thermal conductivity currently available) is selected.
  • a sol solution is prepared by adding 1.4 wt % of concentrated hydrochloric acid (12 N) as a catalyst to a high-molar sodium silicate (silicate aqueous solution; Si concentration of 14%), and stirring the mixture.
  • the sol solution is poured onto nonwoven fabric 106 (the material is oxidized acryl; the thickness is 0.4 ⁇ m; the basis weight is 50 g/m 2 ; and the dimensions are 12 mm ⁇ 12 mm), and nonwoven fabric 106 is impregnated with the sol solution under the pressure of rollers.
  • the nonwoven fabric impregnated with the sol solution is sandwiched between two PP films (each having a thickness of 40 ⁇ m), and allowed to stand at room temperature (23° C.) for about 20 minutes to transform the sol into a gel.
  • nonwoven fabric 106 with the films is passed through a preset gap of 650 ⁇ m (including the film thickness) between two-axis rollers to squeeze out the excessive gel from nonwoven fabric 106 and achieve a target thickness of 700 ⁇ m.
  • the gel sheet with the films is put in a container, and kept in a 85° C./85 RH % constant temperature and humidity vessel for 3 hours to prevent drying, and silica particles are allowed to grow (through dehydrocondensation reaction of silanol) and form a porous structure.
  • the sheet is taken out of the curing container, and the films are removed.
  • the gel sheet is dipped in hydrochloric acid (6 to 12 N), and allowed to stand at ordinary temperature (23° C.) for 1 hour to incorporate hydrochloric acid in the gel sheet.
  • the gel sheet is dipped in, for example, a mixture of octamethyltrisiloxane (silylation agent) and 2-propanol (IPA; amphiphatic solvent), and placed in a 55° C. thermostat bath to allow reaction for 2 hours. As soon as the trimethylsiloxane bond starts to form, the gel sheet releases hydrochloric acid water, and the solution separates into two layers (the silylation agent is on the top, and the hydrochloric acid water is at the bottom).
  • silation agent octamethyltrisiloxane
  • IPA 2-propanol
  • the gel sheet is transferred to a 150° C. thermostat bath, and dried for 2 hours.
  • Composite layer 102 is a composite of nonwoven fabric 106 and silica aerogel 105 , with some of the fibers of nonwoven fabric 106 sticking out of the surface and end portions. Any method may be used to form the structure in which the fibers of the nonwoven fabric 106 are sticking out of composite layer 102 , and the method is not limited.
  • the surface and end portions of composite layer 102 obtained after the steps (1) to (9) of producing composite layer 102 above are roughened with, for example, an adhesive roller or a brush to expose fibers.
  • composite layer 102 with sticking fibers may be obtained without grinding by optimizing the thicknesses of silica aerogel 105 and nonwoven fabric 106 in such a way as to expose fibers of nonwoven fabric 106 in the steps of producing the gel sheet.
  • the coating material that coats composite layer 102 is configured from at least a hydrophilic base coating material, and thermosetting lipophilic resin 113 .
  • the mainstream base coating material is a hydrophilic coating material containing particulate hydrophilic resin 112 dispersed in water solvent. Because of the unique structure resulting from the hydrophobization, silica aerogel 105 of the present embodiment, unlike its original form, blends well with lipophilic resin, and the network structure is destroyed by blending with lipophilic resin. It is accordingly necessary that the coating material be basically a hydrophilic material.
  • the hydrophilic coating material is required to blend well with water solvent, and can be classified into a self-emulsion type having a hydrophilic functional group attached to the skeleton of hydrophilic resin 112 , and a forced-emulsion type in which the resin is forcibly dispersed with the use of an emulsifier.
  • hydrophilic resin 112 as a base material include acrylic resins, polyurethane resins, polyester resins, epoxy resins, silicone resins, and fluororesins.
  • acrylic resins typically have desirable properties including lightfastness, weather resistance, monomer variety, relatively low cost, colorlessness and transparency, and glossiness.
  • Polyurethane resins have different types of bonds within the molecule, such as urethane bonds and urea bonds, and are configured from a strongly aggregated hard segment and a flexible soft segment. This makes polyurethane resins desirable in properties such as adhesion for a substrate, coating hardness, abrasion resistance with high elasticity, durability, waterfastness, and chemical resistance.
  • the polyester resins used in the embodiment are alkyd resins, which have a fatty acid side chain linked by ester linkage to the main chain of a copolyester or a polyester of reduced crystallinity. Because the backbone of the main chain has the ester bond formed by reaction of a carboxyl group with a hydroxyl group, the polyester resins have high adhesion for a substrate, high coating strength, and desirable heat resistance.
  • the coating materials containing hydrophilic resin 112 as a base are inferior to common solvent-based coating materials with respect to the following, for example.
  • the coating has a small Tg, and the adhesion is poor.
  • the coating material used in the present embodiment has a unique structure in which thermosetting lipophilic resin 113 is added and finely dispersed in the form of islands (“island-in-sea structure”) in hydrophilic resin 112 .
  • Thermosetting lipophilic resin 113 blends well with fibers of water repellent nonwoven fabric 106 , and was found to exhibit strong adhesion upon being joined to nonwoven fabric 106 and thermally cured.
  • 2-Propanol (IPA) is one such alcohol.
  • thermosetting lipophilic resin 113 Being an amphiphatic solvent, 2-propanol was found to be capable of controlling the particle size of the thermosetting lipophilic resin 113 , and the adhesion for fibers of nonwoven fabric 106 improved when thermosetting lipophilic resin 113 had a smaller particle size.
  • hydrophilic resin 112 used to disperse lipophilic resin 113 of the present embodiment in the form of islands are water-based acrylic resins, water-based urethane resins, and water-based polyester resins, of which the water-based polyester resins are most suited.
  • a reactive one-component epoxy resin was found to be suitable as lipophilic resin 113 .
  • a lipophilic resin When adding a lipophilic resin to a water-based coating material, it is typical to use a hydrophilic resin having high compatibility with the water-based coating material.
  • the present embodiment is intended to improve adhesion for coating film 111 by causing lipophilic resin 113 to adhere to fibers of nonwoven fabric 106 sticking out of composite layer 102 , and, in order to enable pin-point bonding and reinforcement of fibers, it is important that lipophilic resin 113 does not dissolve into the water-based coating material.
  • a lipophilic one-component epoxy resin needs to be selected, and finely dispersed in the water-based coating material in the form of an island-in-sea structure.
  • Heat insulator 110 formed upon application of the coating material has a structure in which fibers of nonwoven fabric 106 are sticking out of the surface layer of composite layer 102 formed by attachment and integration of silica aerogel 105 into nonwoven fabric 106 through aggregation.
  • nonwoven fabric 106 binds to coating film 111 , and lipophilic resin 113 is present in coating film 111 by being dispersed in a scattered fashion in the form of an island-in-sea structure.
  • Coating film 111 has a thickness of preferably 1 to 100 ⁇ m, more preferably 10 to 30 ⁇ m. When the thickness is less than 1 ⁇ m, the film strength weakens, and the film easily breaks. When coating film 111 is thicker than 100 ⁇ m, the heat insulating performance deteriorates.
  • Lipophilic resin 113 has a particle size of preferably 0.1 ⁇ m to 50 ⁇ m, and the epoxy content in the coating film is preferably 5 to 50 weight %.
  • the particle size is less than 0.1 ⁇ m, hydrophilicity increases, and the film becomes weaker.
  • the particle size is larger than 50 ⁇ m, lipophilic resin 113 adheres to fibers of nonwoven fabric 106 at fewer points, and the adhesion weakens.
  • lipophilic resin 113 contacts fibers of nonwoven fabric 106 at fewer contact points, and the adhesion weakens.
  • the epoxy content is higher than 50 weight %, lipophilic resin 113 readily blends with lipophilic silica aerogel 105 , and destroys the fine structure of silica aerogel 105 . This leads to poor heat insulation.
  • the epoxy content is further preferably 10 to 30 weight %.
  • thermosetting lipophilic resin 113 examples of hydrophilic resin 112 and thermosetting lipophilic resin 113 used in the embodiment are described below. It is to be noted that the heat insulator structure presented in the embodiment is not limited to the following exemplary materials.
  • a hydrophilic polyester resin Pluscoat Z-880 (Goo Chemical Co., Ltd.) was used as hydrophilic resin 112 .
  • a Novacure HX3941HP (Asahi Kasei) was used as thermosetting lipophilic resin 113 .
  • 2-Propanol (IPA) (amphiphatic solvent) was used as a compatibilizing agent.
  • the components (a) to (c) were weighed, and mixed and stirred with a disper for 15 minutes to make a coating material for forming an island-in-sea structure.
  • the coating material is applied by printing on composite layer 102 having fibers of nonwoven fabric 106 sticking out of the surface portion, using a printing mask and a squeegee. After application, the coating material is heat cured to form coating film 111 .
  • Coating film 111 may cover the whole composite layer 102 with the coating material applied to not only the surface portion but end portions of composite layer 102 . All surfaces of the composite layer 102 can be coated by applying the coating material to both surfaces and end portions in the same fashion.
  • composite layer 102 may be completely dipped in the coating material using a dipping method.
  • Composite layer 102 after the application of the coating material to both surfaces is dried in a 120° C. thermostat bath for 15 minutes. This causes water to evaporate, and the particles of the epoxy resin (lipophilic resin 113 ) to cure in a curing reaction, forming coating film 111 .
  • Coating film 111 had a thickness of 30 ⁇ m, and thermosetting lipophilic resin 113 had a particle size of 5 ⁇ m. The particle fraction of thermosetting lipophilic resin 113 was about 20%.
  • Nonwoven fabric 106 of composite layer 102 had some of its fibers sticking out of the surface layer of composite layer 102 , and these fibers, which are lipophilic, blended well with lipophilic resin 113 of coating film 111 in the outermost layer, and strongly bonded itself to lipophilic resin 113 in a reaction that provided excellent adhesion.
  • reactive lipophilic resin 113 is dispersed in the form of islands in an island-in-sea structure, and strong adhesion occurs as lipophilic resin 113 chemically reacts with fibers of nonwoven fabric 106 .
  • the heat insulating effect of heat insulator 110 is exploited by placing heat insulator 110 over a curved surface of a heat generating component.
  • the base polyester resin is flexible, and the foregoing structure provides high adhesion. This prevents detachment of coating film 111 from composite layer 102 , and heat insulator 110 can exhibit desirable heat insulating performance.
  • the fine particles of silica aerogel 105 enclosed in composite layer 102 also can be prevented from being exposed on the surface.
  • Coating film 111 measuring 10 mm in width and 30 ⁇ m in thickness was formed on composite layer 102 , and tensile strength was measured using a 90-degree peeling method.
  • Heat insulator 110 formed by coating a 30 ⁇ m-thick coating film 111 on composite layer 102 had a thermal conductivity of 0.07 W/m ⁇ K, confirming that heat insulator 110 had excellent heat insulating performance comparable to that of composite layer 102 alone.
  • the heat insulator of the embodiment can prevent separation of silica aerogel particles, and, because the heat insulating performance is maintained, the heat insulator can be used for heat insulating purposes in applications such as in mobile devices.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Thermal Insulation (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US16/198,236 2017-12-08 2018-11-21 Heat insulator Abandoned US20190177911A1 (en)

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CN109898332B (zh) 2021-10-15

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