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    • 41. 发明申请
    • POLYAMPHOLYTE COAGULANT IN THE PAPERMAKING PROCESS
    • 聚丙烯酰胺在造纸工艺中的应用
    • WO00034581A1
    • 2000-06-15
    • PCT/US1999/029135
    • 1999-12-08
    • D21H17/01D21H17/37D21H17/43D21H17/45D21H21/02D21H21/10D21H23/14D21H17/33D21H17/41D21H17/42D21H17/44D21H17/55
    • D21H21/02D21H17/01D21H17/37D21H17/375D21H17/43D21H17/455D21H21/10D21H23/14
    • In the papermaking process, a polyampholyte coagulant is used as a retention/drainage/formation aid in a papermaking process; is used to treat coated broke where the white pitch or stickies and pigments are affixed to the long fibers and fiber fines; and is used to clarify the process water where the solids from the white water are either settled out or floated for their removal from the water. As a retention/drainage formation aid, the polyampholyte coagulant polymer is added to the papermaking cellulosic slurry prior to the first or after the last shearing stage, and, optionally, a flocculant may be added either before the addition of the polyampholyte coagulant or before the first or the last shearing stage. The polyampholyte coagulant has a weight average molecular weight from 10 thousand to 20 million, is in emulsion or solution form, and may comprise a copolymer of acrylic acid (anionic) and diallyl dimethyl ammonium chloride (cationic) in a weight percentage ratio range of from about 1:999 to about 99:1 based on the dry weight of the polyampholyte, or may comprise a terpolymer of acrylamide (nonionic), acrylic acid (anionic), and diallyl dimethyl ammonium chloride (cationic).
    • 在造纸过程中,在造纸过程中使用聚阴离子凝结剂作为保留/排水/形成辅助剂; 用于处理涂层断裂,其中白色沥青或粘性和颜料固定在长纤维和纤维细粉上; 并用于澄清工艺用水,其中来自白水的固体沉淀或漂浮以从水中除去。 作为保留/排水形成助剂,在第一次或最后一次剪切阶段之后,将聚丙烯酸凝固剂聚合物加入到造纸纤维素浆料中,并且任选地,可以在加入聚阴离子凝结剂之前或之前加入絮凝剂 第一次或最后一次剪切阶段。 聚阴离子凝结剂的重均分子量为10,000至2000万,为乳液或溶液形式,并且可以包含丙烯酸(阴离子)和二烯丙基二甲基氯化铵(阳离子)的共聚物,重量百分比范围为 基于聚阴离子的干重约1:999至约99:1,或可包含丙烯酰胺(非离子),丙烯酸(阴离子)和二烯丙基二甲基氯化铵(阳离子)的三元共聚物。