| 摘要 |
PURPOSE: To enable the efficient production of a hollow glass microsphere having a uniform fine diameter and a uniform particle size distribution by spraying a slurry of wet pulverized glass powder of glass containing a foaming agent component and heating the glass. CONSTITUTION: This hollow glass microsphere contains a foaming agent component containing S, C, H and N elements gasifying when melting a glass powder and formed into spheres in an amount of 0.05-20.0wt.% expressed in terms of SO3 , CO2 , H2 O and NO2 in a glass. The hollow microsphere is obtained by wet pulverizing a borosilicate glass, etc., having a high strength and a low elution degree with an alkali in water or a combustible organic liquid, providing a slurry of the glass powder having 0.5-50μm particle diameter at 5-50wt.% concentration, spraying the resultant slurry under 0.1-20kg/cm<2> spraying pressure, heating the glass at a temperature for melting the glass, melting the glass and gasifying the foamable component in the glass.
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