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早在三十年代初,国外就已注意发展外加剂并研制成功了木质素磺酸盐为主要成份的“普蜀里”(POZZOLith)减水剂;五十年代的日本从美国引进了这种减水剂的生产技术。1963年日本花王石碱公司的服部健一等研制出β—萘磺酸甲醛缩合物为主要成份的“玛依太”(Mishth)减水剂;七十年代美国从日本引进了制造高效减水剂的专利。1964年西德研究出另一种以三聚氰胺甲醛缩合物为主要成份的“梅学明”(MeIment)高效减水剂,1974年日本从西德引进了这种减水剂,商品名为 NL—4000。从而形成了
As early as in the early thirties, foreign countries had already paid attention to the development of admixtures and successfully developed “POZZOLITH” water-reducing agent with lignin sulfonate as the main component; in the 1950s, Japan introduced this type of product from the United States. Water reducer production technology. In 1963, Kenichi Kabe of Japan’s Kao Shishi Co., Ltd. developed a “Mishth” water reducing agent containing β-naphthalenesulfonic acid-formaldehyde condensate as the main component; in the 1970s, the United States introduced a high-efficiency water-reducing agent from Japan. Patents. In 1964, West Germany developed another “MeIment” superplasticizer containing melamine formaldehyde condensate as the main ingredient. In 1974, Japan imported the water reducing agent from West Germany under the trade name NL- 4000. Thus formed