The object of the present invention is to provide a defoaming agent that is superior in defoamabilities (initial defoamability and defoaming durability).
The present invention is a defoaming agent comprising a bisamide (A) in dispersion in a polyether compound (B), wherein the content of the bisamide (A) is 0.01 to 10% by weight and the content of the polyether compound (B) is 90 to 99.99% by weight based the weight of the bisamide (A) and the polyether compound (B), and the mode (µm) in the particle diameter distribution on a volume basis of the bisamide (A) is 0.1 to 5 µm.
The bisamide (A) is preferably a bisamide represented by formula (1),
R1-CONH(CH2)t-NHCOR1 (1)
wherein R1 is an alkyl group, an alkenyl group, a hydroxyalkyl group or a hydroxyalkenyl group having 10 to 22 carbon atoms, and t is an integer of 1. to 6.
本发明的目的是提供一种消泡性能(初始消泡性和消泡耐久性)优异的
消泡剂。
本发明是一种
消泡剂,包括分散在聚醚化合物(B)中的双酰胺(A),其中双酰胺(A)的含量为 0.01 至 10%(按重量计),聚醚化合物(B)的含量为 90 至 99.99%(按重量计)(基于双酰胺(A)和聚醚化合物(B)的重量),双酰胺(A)按体积计算的颗粒直径分布模式(µm)为 0.1 至 5 µm。
双酰胺(A)最好是由式(1)表示的双酰胺、
R1-CONH(
CH2)t-NHCOR1 (1)
其中 R1 是具有 10 至 22 个碳原子的烷基、烯基、羟基烷基或羟基烯基,t 是 1 至 6 的整数。