DISPERSANT FOR MAGNETIC PARTICLE SOLUTION USED FOR WET TYPE MAGNETIC PARTICLE CRACK DETECTION TESTING METHOD

摘要

PURPOSE: To provide a dispersant used for a wet type magnetic particle crack detection testing method in which the length of the antifoaming persistence can be controlled. ;CONSTITUTION: In a dispersant for a magnetic particle solution used for a wet type magnetic particle crack detection testing method, which comprises 70-98wt.% water or powder formed by particles dissolved in water and 2-30wt.% nonionic surface active agent with HLB of 8-14, one or two or more nonionic surface active agents selected from,polyoxyethylene alkylether type nonionic surface active agent, a polyoxyethylene alkyl arylether type nonionic surface active agent, a polyoxyethylene alkylester type nonionic surface active agent, a polyoxyethylene alkylamine type nonionic surface active agent, and a polyoxyethylene sorbitan fatty acis ester type nonionic surface active agent and a polyoxyethylene polyoxypropylene alkylether type nonionic surface active agent are used jointly and the antifoaming persistence depending on the compounding ratio of both agents is given to the dispersant.;COPYRIGHT: (C)1996,JPO