SELF-EMULSIONIZING TYPE DEFOAMING AGENT

PROBLEM TO BE SOLVED: To provide a defoaming agent with superior deforming property, causing little repellence, coating unevenness, oil floating, etc. SOLUTION: This self-emulsionizing type defoaming agent comprises polyoxyalkylene compound A expressed by general formula 1, polyoxyalkylene modified silicone B, hydrocarbon C, and a defoaming agent D with HLB of 7-14. In the formula, XO is a 2-4C oxyalkylene group; and n is an integer of 13-77. A hydroxyl value of A is preferably 25-149 mgKOH/g, a cloud point of B is preferably 5-90°C, and a kinematic viscosity is preferably 0.5-100 mm2/s. Contents of A, B, C and D are preferably 50-85 wt.%, 0.05-5 wt.%, 1-10 wt.%, and 13-35 wt.%, based on the total weight of A, B, C and D, respectively. Water E is preferably contained to 1-10 wt.% based on the total weight of A, B, C and D. COPYRIGHT: (C)2007,JPO&INPIT