Heat-insulating sheet and method for manufacturing same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsKUNXIAN CAO, RIKAKO IWASAKI
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Abstract
A heat-insulating sheet includes a fiber sheet having spaces therein and silica xerogel held in the spaces. The heat-insulating sheet includes a high-compressive region and a low-compressive region. A compression rate of the high-compressive region of the heat-insulating sheet with respect to a pressure of 0.25 MPa applied to the high-compressive region is greater than or equal to 30% and less than or equal to 50%. A compression rate of the low-compressive region of the heat-insulating sheet with respect to a pressure of 0.25 MPa applied to the low-compressive region is greater than or equal to 1% and less than or equal to 5%. This heat-insulating sheet has large thermal insulation as a whole.
Claims15
A heat-insulating sheet comprising:
- a fiber sheet having spaces therein;
- and
- silica xerogel held in the spaces, wherein
- the heat-insulating sheet includes a high-compressive region and a low-compressive region,
- a compression rate of the high-compressive region of the heat-insulating sheet with respect to a pressure of 0.25 MPa applied to the high-compressive region is greater than or equal to 30% and less than or equal to 50%, and
- a compression rate of the low-compressive region of the heat-insulating sheet with respect to a pressure of 0.25 MPa applied to the low-compressive region is greater than or equal to 1% and less than or equal to 5%.
A method for manufacturing a heat-insulating sheet, comprising:
- preparing a fiber sheet having spaces therein;
- impregnating a first region of the fiber sheet with a first sol;
- impregnating a second region of the fiber sheet with a second sol different from the first sol;
- forming first silica gel in the first region by causing the first sol with which the first region is impregnated to gel;
- forming second silica gel in the second region by causing the second sol with which the second region is impregnated to gel;
- hydrophobizing the first silica gel;
- hydrophobizing the second silica gel;
- and
- drying the hydrophobized first silica gel and the hydrophobized second silica gel, wherein after said drying of the hydrophobized first silica gel and the hydrophobized second silica gel, a compression rate of the first region with respect to a pressure of 0.25 MPa applied to the first region is greater than or equal to 30% and less than or equal to 50%, and a compression rate of the second region with respect to a pressure of 0.25 MPa applied to the second region is greater than or equal to 1% and less than or equal to 5%.
A heat-insulating sheet comprising:
- a fiber sheet having spaces therein;
- and
- silica xerogel held in the spaces, wherein
- the heat-insulating sheet includes a high-compressive region and a low-compressive region, the high-compressive region being located in a center portion of the heat-insulating sheet, the low-compressive region surrounding the high-compressive region, and
- a compression rate of the high-compressive region with respect to a pressure of 5 MPa applied to the high-compressive region is larger than a compression rate of the low-compressive region with respect to a pressure of 5 MPa applied to the low-compressive region.
A method for manufacturing a heat-insulating sheet, comprising:
- preparing a fiber sheet having spaces therein;
- forming a material sheet by impregnating the spaces of the fiber sheet with a silica sol containing water glass and ethylene carbonate;
- forming silica gel by causing the silica sol with which the spaces is impregnated to gel while a temperature of a center portion of the material sheet is higher than a temperature of a peripheral portion of the material sheet surrounding the center portion of the material sheet by a difference equal to or larger than 50° C.;
- and
- hydrophobizing the silica gel, wherein
- a compression rate of a center portion of the heat-insulating sheet located in the center portion of the material sheet with respect to a pressure of 5 MPa applied to the center portion of the heat-insulating sheet is larger than a compression rate of a peripheral portion of the heat-insulating sheet surrounding the center portion of the heat-insulating sheet with respect to a pressure of 5 MPa applied to the peripheral portion of the heat-insulating sheet.
Dependencies are inferred from the claim text.