| 摘要 |
Hydraulic cement compositions comprise hydraulic cement and an amine salt of a carboxylic acid containing an aromatic group. The composition is made by grinding the cement with the amine salt as a grinding aid that enhances the efficiency of the grinding operation and inhibits pack-set tendencies in the composition. Preferred amine salts for use in the compositions are novel reaction products and are salts obtained from a mixture of aromatic carboxylic acids obtained as a low cost by-product in the commercial production of phthalic anhydride with an amine, which may itself be a commercial by-product from the synthesis of ethanolamine. |
