Defoamer for concrete admixtures

摘要

The present invention is directed to a defoaming agent for use with polycarboxylate based admixtures for concrete. The defoaming agent is comprised of tributyl phosphate, an alkylaryl sulfonic acid metallic salt and a modified alkylpolyalcoxyester. Tributyl phosphate is a phosphate ester based defoamer and the modified alkylpolyalcoxyester is an air detraining agent. The alkylaryl sulfonic acid metallic salt is used as a hydrotrope to ensure that the tributyl phosphate and the modified alkylpolyalcoxyester react and do not separate.