| 摘要 |
PVA is crosslinked with an agent present in a molar concentration, relative to monomer residues, of 0.01 - 1%. The agent may be formaldehyde, acetaldehyde, glyoxal, glutaraldehyde, maleic acid, oxalic acid, dimethylurea, polyacroyleine, diisocyanate, divinyl sulphonate or a chloride of a diacid. Its application is that of a fluid loss control agent in fluids used in the oil industry, in particular cement slurries, separating fluids, or "spacers", and drilling muds. Its advantages are that it does not delay the selling of the cement and that it has high temperature properties that are relatively insensitive to external conditions. |
