Low molecular weight phosphorus-containing polyacrylic acids and use thereof as scale inhibitors in water-carrying systems
    6.
    发明授权
    Low molecular weight phosphorus-containing polyacrylic acids and use thereof as scale inhibitors in water-carrying systems 有权
    低分子量含磷聚丙烯酸及其在携带水系统中作为阻垢剂的用途

    公开(公告)号:US08889033B2

    公开(公告)日:2014-11-18

    申请号:US13363576

    申请日:2012-02-01

    摘要: The invention relates to an aqueous solution of acrylic acid polymers, obtainable by polymerization of acrylic acid in feed mode with peroxodisulfate as initiator in the presence of hypophosphite in water as solvent, wherein (i) water and optionally one or more ethylenically unsaturated comonomers are initially charged, and (ii) acrylic acid in acidic, unneutralized form, optionally one or more ethylenically unsaturated comonomers, aqueous peroxodisulfate solution and aqueous hypophosphite solution are added continuously, and (iii) a base is added on completion of the acrylic acid feed to the aqueous solution, wherein the comonomer content does not exceed 30% by weight, based on total monomer content.

    摘要翻译: 本发明涉及丙烯酸聚合物水溶液,其可通过丙烯酸以进料方式与过氧二硫酸盐作为引发剂在次亚磷酸盐存在下作为溶剂在水中的聚合反应获得,其中(i)水和任选的一种或多种烯键式不饱和共聚单体最初是 带电,和(ii)酸性,未中和形式的丙烯酸,任选的一种或多种烯键式不饱和共聚单体,过二硫酸氢盐水溶液和次磷酸钠水溶液,并且(iii)在丙烯酸进料完成后加入碱 水溶液,其中基于总单体含量,共聚单体含量不超过30重量%。

    LOW MOLECULAR WEIGHT PHOSPHORUS-CONTAINING POLYACRYLIC ACIDS AND USE THEREOF AS DISPERSANTS
    9.
    发明申请
    LOW MOLECULAR WEIGHT PHOSPHORUS-CONTAINING POLYACRYLIC ACIDS AND USE THEREOF AS DISPERSANTS 有权
    低分子量含磷酸的聚丙烯酸及其作为分散剂的用途

    公开(公告)号:US20120220707A1

    公开(公告)日:2012-08-30

    申请号:US13364877

    申请日:2012-02-02

    摘要: Aqueous solutions of acrylic acid polymers are prepared by polymerization of acrylic acid in a feed operation with a free-radical initiator in the presence of hypophosphite in water as solvent, by a process comprising (i) initially charging water and optionally one or more ethylenically unsaturated comonomers, (ii) continuously adding acrylic acid in acidic, unneutralized form, optionally one or more ethylenically unsaturated comonomers, aqueous free-radical initiator solution and aqueous hypophosphite solution, and (iii) adding a base to the aqueous solution on completion of the acrylic acid feed, wherein a comonomer content does not exceed 30% by weight and the aqueous hypophosphite solution is added during a total feed time made up of three consecutive feed time spans ΔtI, ΔtII, and ΔtIII, wherein the average feed rate in the second feed time span ΔtII is greater than the average feed rates in the first and third feed time spans ΔtI and ΔtIII.

    摘要翻译: 通过以下方法制备丙烯酸聚合物的水溶液,该方法包括:(i)初始加入水和任选的一种或多种烯属不饱和的,由丙烯酸在进料操作中与自由基引发剂在次亚磷酸盐存在下,在水中作为溶剂, 共聚单体,(ii)以酸性,未中和形式连续加入丙烯酸,任选地一种或多种烯属不饱和共聚单体,自由基引发剂水溶液和次磷酸钠水溶液,和(iii)在丙烯酸完成时向水溶液中加入碱 酸进料,其中共聚单体含量不超过30重量%,并且在由三个连续进料时间跨度&Dgr; tI,&Dgr; tII和&Dgr; tIII组成的总进料时间内加入次磷酸钠溶液,其中平均 第二进料时间跨度和Dgr; tII的进料速率大于第一和第三进料时间跨度&Dgr; tI和&Dgr; tIII中的平均进料速率。