| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problem: the thickness of a heat insulation layer 11 becomes ununiform due to a liquid sag of a heat insulation material applied to a base material 1.SOLUTION: A heat insulation layer 11 includes a large number of spherical hollow particles 12, and a binder 13 that forms a base material for the heat insulation layer 11 by retaining the spherical hollow particles 12 in the base material 1 and filling spaces among the spherical hollow particles. A large number of second particles 15, the surfaces of which each have irregularities or a functional group coupled to the binder 13 and which are smaller in particle diameter than the hollow particle 12, are added to the binder 13.SELECTED DRAWING: Figure 3 |
