公开(公告)号：US20160167997A1

公开(公告)日：2016-06-16

申请号：US14906769

申请日：2014-07-24

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Ikuko CHIBA ,  Naohiro NAGAI ,  Takanori YOSHINO ,  Masato NAKANO ,  Yuki SANO

IPC: C02F5/10 ,  C23F11/173

CPC classification number: C02F5/10 ,  C02F2103/023 ,  C02F2303/08 ,  C23F11/173 ,  C08F220/06 ,  C08F216/14

Abstract: A method for treating a cooling water system includes adding a (meth)acrylic acid-based copolymer to a cooling water system having a part where the calcium hardness of the cooling water is 150 to 300 mg/L and the flow rate of the cooling water is 0.3 to 0.5 m/s, wherein the (meth)acrylic acid-based copolymer has a structural unit (a) derived from a specific (meth)acrylic acid-based monomer (A) and a structural unit (b) derived from a specific (meth)allyl ether-based monomer (B), the content of the structural unit (b) is 15% by mole to 20% by mole relative to 100% by mole of the structural units derived from all the monomers, the weight-average molecular weight of the (meth)acrylic acid-based copolymer is 10,000 to 30,000, and at least one of the main chain terminal groups of the (meth)acrylic acid-based copolymer is a sulfonic acid group or a salt thereof.

Abstract translation: 一种冷却水系统的处理方法，其特征在于，在具有冷却水的钙硬度为150〜300mg / L的部分和冷却水的流量的冷却水系统中，添加（甲基）丙烯酸系共聚物 （甲基）丙烯酸系共聚物具有来源于特定的（甲基）丙烯酸类单体（A）的结构单元（a）和来源于（甲基）丙烯酸系单体 特定（甲基）烯丙基醚类单体（B）中，结构单元（b）的含量相对于衍生自所有单体的结构单元的100摩尔％为15摩尔％至20摩尔％，重量 （甲基）丙烯酸类共聚物的平均分子量为10,000〜30,000，（甲基）丙烯酸系共聚物的至少一个主链端基为磺酸基或其盐。

公开(公告)号：US20230375291A1

公开(公告)日：2023-11-23

申请号：US18031008

申请日：2021-10-06

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Takanori YOSHINO ,  Takashi KIKKAWA ,  Kazuhisa FUJITA ,  Natsumi TANIYAMA ,  Marina YANAGIDA

IPC: F28F23/00 ,  C09K5/20

CPC classification number: F28F23/00 ,  C09K5/20 ,  F28F2025/005

Abstract: The present invention provides a technique for improving the cooling performance of a cooling tower in a circulating cooling water system having the cooling tower. The present invention provides a method for improving cooling performance of a cooling tower in a circulating cooling water system having the cooling tower, wherein cooling water used in the circulating cooling water system is cooling water to which an agent including a surfactant is added, and the cooling water satisfies (a) a dynamic contact angle of 55° or less and (b) a bubble bulkiness of 250 mL or less.

公开(公告)号：US20240401207A1

公开(公告)日：2024-12-05

申请号：US18699889

申请日：2022-08-31

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Takanori YOSHINO ,  Ayako KUMAGAI ,  Kazuhisa FUJITA ,  Kenya SATO ,  Kazuya WATANABE ,  Wei XIA

IPC: C23F15/00

Abstract: The present invention addresses the problem of providing a technique for a metal corrosion protection treatment for a water system, whereby it becomes possible to achieve a satisfactory anticorrosive effect without using a phosphorus compound, which is a causative substance for eutrophication, as a metal anticorrosive agent and it also becomes possible to achieve a satisfactory anticorrosive effect in high-hardness water as well as low-hardness water. The present invention can provide: a metal corrosion protection treatment method for a water system, in which a component (A) and a component (B) as mentioned below are allowed to be present at a usage ratio of 1:9 to 7:3 by mass in the water system; and (A) a copolymer of a (meth)acrylic acid monomer and a sulfonic acid monomer, and (B) a maleic acid-based polymer in which the carboxyl group content is 11.5 mmol/g or more.