| 摘要 |
<p>PROBLEM TO BE SOLVED: To lighten a vacuum heat insulating body by depressurizing and sealing the inside of an outer member including a room temperature activation type getter material and the like. SOLUTION: As a room temperature activation type getter material to eliminate at least nitrogen, oxygen, a water content and carbon dioxide, a combo getter including barium-lithium alloy is used for a gas absorbent 6. Powder 4 formed of hard urethane foam powder prepared by being ground and 'a Toku-seal P(R)' 5 equivalent to about 3 wt.% in 2 weight parts of a core 2 are mixed with each other and agitated, and a predetermined amount is filled into an inner bag member 3 having permeability, thereby the core 2 of this vacuum heat insulating body 1 can be prepared. At its time, the 'Toku-seal P(R)' 5 is reacted as a supreplasticizer, therefore the powder 4 formed of the hard urethane foam powder can be formed into the best filling shape. After heat treatment is applied to the core 2 at about 150 deg.C for about 1 hour, the core 2 is inserted together with the gas absorbent 6 in a gas barrier film-made outer member 7. Vacuum exhaustion is performed by a vacuum chamber equipped with a thermal seal device, and the end part of the outer member 7 is sealed by thermal seal.</p> |
