| 摘要 |
A process for making a sulfur foam containing at least 50 weight percent sulfur which comprises (a) contacting and reacting molten sulfur with a carboxylic acid which is reactive with the molten sulfur so as to incorporate the acid with the molten sulfur and form a molten sulfur-acid adduct containing carboxylic acid groups; (b) mixing the molten adduct with an alkali earth metal carbonate and a foam stabilizer such as talc or mica to obtain a mixture; and (c) reacting said mixture with phosphoric acid in the absence of any added phosphorus sulfide to obtain the foam. Preferably the molten sulfur is reacted with a plasticizer such as dicyclopentadiene before foaming with phosphoric acid.
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