Tsubaki Tsuneo of Nippon Shokubai Company invented the polycarboxylic acid water-reducing agent in the 1980s. Its molecular structure is different from the linear structure of previous high-efficiency water-reducing agents. A comb-like molecular structure composed of a main chain of acid groups and long polyoxyethylene side chains. Immediately afterwards, an ester carboxylate water-reducing agent obtained by polymerizing alkoxy polyethylene glycol acrylate and methacrylic acid monomer was invented. It has created a new situation in the research and application of polycarboxylic acid-based water reducing agents. In 1986, the company obtained the patent for polycarboxylic high-performance water-reducing agent for the first time. In 1984, Keiichi Ono of Nippon Electric Company used carboxylic acid-ethylene polymerization to synthesize a carboxylic acid-based water-reducing agent. I wish you a happy work and adopt it