| 摘要 |
PURPOSE:To easily disperse inorg. microballoons in resin, to make them lightweight and to improve the heat retaining property and strength by coating the microballoon with a film of fine-grain org. polymer carrying an inorg. fine grain on the surface. CONSTITUTION:An inorg. microballoon is added into a dispersion of a coagulant to coagulate a fine-grain org. polymer, especially of an inorg. sol such as a positively charged alumina sol, then an emulsion of an org. polymer carrying an inorg. fine grain on the surface is added in small amts. under strong agitation, and the polymer is coagulated on the surface of the microballoon to form a gel-like film. The film is densified by drying such a slurry dispersion in a spray drier, and a fine-powder composite microballoon is obtained. The microballoon is not easily broken even with a high shearing force, and the heat resistance is improved. Consequently, the microballoon is mixed in paint or adhesive to make it lightweight and to improve the heat retaining property and strength. |
