申请人:BASF WYANDOTTE CORPORATION
公开号:EP0062891A1
公开(公告)日:1982-10-20
This invention relates to thickened high-viscosity water based hydraulic fluids. Such fluids are prepared by blending water, organic thickener and conventional hydraulic fluid additives. Organic thickeners tend to lose their thickening effect with time, and particularly when subjected to oxidizing agents, heat, prolonged use in a pump, etc. In accordance with the instant invention, preservation of the thickener. particularly with respect to. viscosity loss, is achieved by blending with the final fluid a fluid concentrate, or the thickener itself, a compound selected from the group consisting of ethylene glycol, propylene glycol, propylene glycol polymers and copolymers containing at least 50 percent by weight of oxypropylene groups, a dimercaptothiadiazole, neodecanoic acid, a hindered phenol antioxidant and mixtures thereof.
本发明涉及增稠的高粘度水基液压油。这种液压油是通过混合水、有机增稠剂和常规液压油添加剂制备的。有机增稠剂往往会随着时间的推移而失去增稠效果,特别是在受到氧化剂、热量、在泵中长期使用等情况下。根据本发明,可通过在最终流体中掺入流体浓缩物或增稠剂本身、一种选自乙二醇、丙二醇、丙二醇聚合物和共聚物(按重量计至少含有 50%的氧丙烯基团)、二巯基噻二唑、新癸酸、受阻酚抗氧化剂及其混合物的化合物来实现增稠剂的保存,特别是在粘度损失方面。