Antifoaming agent, water-soluble resin composition containing the same, and water-soluble resin aqueous solution

摘要

An object of the present invention is to provide an antifoaming agent that does not deteriorate transparency even when applied to a water-soluble resin and is excellent in antifoaming properties. The present invention comprises a polyether compound having a cloud point of 20 to 60 ° C. in a 1% ion exchange aqueous solution and metal oxide fine particles selected from fumed metal oxides and colloidal metal oxides. An antifoaming agent characterized in that the content of the polyether compound is 80 to 99.9% and the content of the metal oxide fine particles is 0.1 to 20% based on the weight of the fine particles; and 1 The content of the polyether compound based on the weight of the polyether compound and the metal oxide fine particles, comprising a polyether compound having a cloud point of 20 to 60 ° C. in the% ion-exchange aqueous solution, metal oxide fine particles, and water. 80 to 99.9%, the content of metal oxide fine particles is 0.1 to 20%, and the content of water is 1 to 10%.