| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material capable of maintaining heat insulating performance for a long period of time even if material of which heat insulating performance greatly changes according to inner pressure change such as a fiber system is used as core material. <P>SOLUTION: In the vacuum heat insulating material 1 including at least a plurality of core materials 2 composed of fiber system material, a casing material 3, and gas adsorbent 4 made of ZSM-5 type zeolite subjected to copper ion exchange, the absorbent 4 has monovalent copper as not less than 73% of copper site of ZSM-5 type zeolite subjected to copper ion exchange, and is arranged at one or more core material 2 parts. Inner pressure change due to gas invasion with time is inhibited by application of the gas adsorbent 4 having excellent adsorption performance. Consequently, heat insulating performance can be maintained for a long period of time even when material of which heat insulating performance is easily affected by inner pressure change is used as the core material. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
