??(2-????) ?? ????? ??? ?? Water treatment defoamer Papermaking defoamer gentian root extract Polyether defoamer Powder defoamer Matting agent Poly(acrylic acid) DOYLE DIRHODIUM CATALYST-RH2(4S-MEOX)4 EMULSIFIER DISPERSING AGENTS Inorganic zinc rich primer Water-soluble inorganic zinc rich primer Epoxy primer Defoamer for paper making Waterproof coating defoamer Waterborne paint defoamer