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    • 7. 发明授权
    • Acrylate/maleate copolymers, their preparation and use as antiscalants
    • 丙烯酸酯/马来酸酯共聚物,其制备和用作防垢剂
    • US4547559A
    • 1985-10-15
    • US476668
    • 1983-03-18
    • Stanley W. Walinsky
    • Stanley W. Walinsky
    • C02F5/10C08F220/04C08F220/06C08F222/04C08F222/06C08F120/08
    • C02F5/10C08F220/04C08F220/06C08F222/04C08F222/06
    • Substantially homogeneous acrylate/maleate copolymers of number average molecular weight of 500 to 5000 are prepared by copolymerizing 35 to 65 mole percent acrylic or methacrylic acid with 65 to 35 mole percent maleic anhydride at 80.degree. to 150.degree. C. in the presence of a polymerization initiator and a chain-transfer solvent such that both the monomers and the formed polymer remain in solution and the mole ratio of the acrylic or methacrylic acid monomer to the maleic anhydride monomer in the solvent is maintained below about 0.2 throughout the polymerization. The copolymers in hydrolyzed form are employed at a level of from about 0.1 to 100 ppm for prevention of alkaline calcium and magnesium scale formation, such as during seawater evaporative desalination.
    • 数均分子量为500至5000的丙烯酸酯/马来酸共聚物的基本上均匀的共聚物是通过在80-150℃下在聚合反应的存在下将35-65摩尔%的丙烯酸或甲基丙烯酸与65-35摩尔%马来酸酐共聚而制备的 引发剂和链转移溶剂,使得单体和形成的聚合物都保留在溶液中,并且丙烯酸或甲基丙烯酸单体与溶剂中马来酸酐单体的摩尔比在整个聚合过程中保持低于约0.2。 水解形式的共聚物以约0.1至100ppm的水平使用,以防止碱性钙和镁结垢形成,例如在海水蒸发脱盐期间。