| 摘要 |
PURPOSE:To improve the appearance of the surface of concrete by eliminating the generation of air bubble marks on the surface of concrete while keeping high releasability by using a release agent containing a release auxiliary agent consisting of a nonionic surfactant represented by a specific general formula and diorganosiloxane. CONSTITUTION:A release auxiliary agent contains a nonionic surfactant represented by formula I obtained by reacting polyoxyalkylene glycol or alkylene oxide and aliphatic or aromatic carboxylic acid and diorganopolysiloxane as essential components and, if desired, mineral oil is added to the auxiliary agent. In the formula, A and B are a hydrogen or a 2-22C acyl group, R<1>, R<2> and R<3> are a 1-2C alkyl group, (a) and (e) are an integer of 0-15, (b) and (d) are an integer of 0-22, (c) is an integer of 0-100, the sum total of (b), (d) and c is an integer of 8 or more, A and B are not together a hydrogen atom and may be together an acyl group, where A and B can be same or can be different. |
