Outer covering material for vacuum heat insulation material and vacuum heat insulation material comprising same
Provided is an outer covering material for a vacuum heat insulation material, the outer covering material having a laminated structure which sequentially, from the top, comprises: a protecting layer; a barrier layer; and a sealing material, wherein the barrier layer comprises: a polyethylene terephthalate (PET) resin film on which an aluminum oxide film is deposited; and an ethylene vinyl alcohol (EVOH) resin film on which a metal thin film is deposited. Provided is a vacuum heat insulation material, comprising: a core material consisting of glass fibers; and the outer covering material which houses the core material and decompresses the inner portion thereof.
1. A vacuum heat insulation material, comprising:
a core material made of a glass fiber, wherein the glass fiber has an average diameter of more than 0 μm and 2 μm or less;
an outer covering material accommodating the core material and having a reduced internal pressure, wherein the outer covering material has a laminated structure sequentially comprising, from an outermost layer:
a protective layer, wherein the protective layer comprises a nylon film;
an aluminum oxide film, wherein the aluminum oxide film has a thickness ranging from 0.1 μto 0.2 μm;
a polyethylene terephthalate (PET) resin film, wherein the PET resin film has a thickness ranging from 10 μm to 12 μm;
a metal thin film, wherein the metal thin film has a thickness ranging from 0.05 μm to 0.1 μm;
an ethylene vinyl alcohol (EVOH) resin film, wherein EVOH resin film has a thickness ranging from 10 μm to 12 μm; and
a sealing layer, wherein the sealing layer comprises a thermoplastic plastic film, and the thermoplastic plastic film comprises a non-stretched polypropylene (CPP) film.
2. The vacuum heat insulation material according to claim 1 , wherein the sealing layer comprises a thermoplastic plastic film having a melting point of 125° C. or more.
3. The vacuum heat insulation material according to claim 1 , wherein the CPP film has a thickness of 25 μm to 60 μm.
4. The vacuum heat insulation material according to claim 1 , wherein the nylon film has a thickness of 15μm to 25 μm.
5. The vacuum heat insulation material according to claim 1 , wherein the outer covering material has a water vapor permeability of 0.01 to 0.1 g/m 2 ·day at 38° C. under 100% RH atmosphere.