| 摘要 |
<p>A fixed abrasive grinding media is disclosed which includes a high open cell content polyurethane foam binder in which is dispersed a high concentration, from 50 to 70% by weight, of abrasive particles. The binder system includes one or two hydrophilic polyols; an low molecular weight, highly reactive isocyanate; a surfactant that controls open cell formation; water and dual catalysts. One catalyst promotes the isocyanate-water reaction and the other promotes only the isocyanate-polyol reaction.</p> |
