Preparation method for polycarboxylate water reducer having regular sequence structure

US11548967B2 · kind B2 · utility

Assignees

• SOBUTE NEW MATERIALS CO., LTD. · CN
• NANJING BOTE NEW MATERIALS CO., LTD. · CN
• BOTE BUILDING MATERIALS (TIANJIN) CO., LTD. · CN
• BOTE NEW MATERIALS TAIZHOU JIANGYAN CO., LTD.

Inventors

• Shuying Zhai · Nanjing, CN
• Yong Yang · 红钢城街道, CN
• Dongliang Zhou · Nanjing, CN
• Xin Shu · Nanjing, CN
• Qianping Ran · 安丰镇, CN
• Han Yan · Beijing, CN
• Hongxia Zhao · Mölndal, SE

Key dates

• Filing date: Feb 26, 2019
• Grant date: Jan 10, 2023
• Expiry date: Jan 12, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2438/03
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed is a preparation method of a polycarboxylate water reducer having a regular sequence structure. The preparation method of the present invention comprises: performing Michael addition on polyethylene glycol ether acrylate macromonomer A and amino-containing carboxylic acid B for 5-12 hours, then cooling to 0° C., dropwise adding acryloyl chloride slowly and evenly, and further reacting for 12 hours at room temperature to obtain carboxyl-containing polyether macromonomer C; mixing the carboxyl-containing polyether macromonomer C, a small molecular RAFT reagent, an initiator, and water adequately; and holding the polymerization mass concentration at 30%-60% and heating to 60-80° C. in the atmosphere of N2 to react for 2-5 hours to obtain the polycarboxylate water reducer having a regular sequence structure.