| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a two-liquid curable polyurethane-based sealing material composition which can obtain suitable durability even though the specific gravity is reduced and can also suppress the occurrence of springback after the use of a caulking gun.SOLUTION: There is provided a two-liquid curable polyurethane-based sealing material composition which comprises a first liquid containing a urethane prepolymer and a second liquid containing a polyol, wherein the first liquid and/or the second liquid contain a polyaldimine, the second liquid contains 10 to 20 mass% of a resin-based fine hollow body having an average particle diameter of 10 to 40μm based on the total mass of the second liquid, the thixotropic index [(the viscosity of the second liquid at 1 rpm)/(the viscosity of the second liquid at 10 rpm)] calculated by a ratio of the viscosity (Pas) of the second liquid measured at 23°C, a relative humidity of 50% and a rotation speed of 1 rpm and 10 rpm using a BS type viscometer No. 7 rotor is 2.9 or more.</p> |
