Octamethylenephosphonic acid terminated polyamidoamine dendrimer and its use as antiscalant

摘要

A preparation method of octamethylenephosphonic acid terminated, PAMAM dendrimer and application thereof is provided, the dendrimer is prepared by modifying amino groups of 0 generation PAMAM dendrimer with methylene phosphonic acid, a constitutional formula thereof is: (CH₂)_n{N[CH₂CH₂CONHCH₂CH₂N(CH₂PO₃H₂)₂]₂}₂, wherein n is a positive integer between 2˜6. The octamethylenephosphonic acid terminated, PAMAM dendrimer has an excellent performance to inhibit scales of CaCO₃, CaSO₄ and Ca₃(PO₄)₂, a very high calcium tolerance, and excellent dispersing performance. The octamethylenephosphonic acid terminated, PAMAM dendrimer is used as an antiscalant in industrial water treatment, and is suitable for the industrial water treatment of boiler, cooling, desalination, and oil production, etc., especially for the industrial water treatment under high calcium concentration.