| 摘要 |
<p>A unique solvent blend and method of conducting vapor degreasing operations is disclosed, wherein synergism is obtained by the addition of a component to three known vapor degreasing solvents The vapor degreasing solvents of the invention comprise a blend selected from the group consisting of perchlorethylene and trichlorethylene or 1, 1, 1, trichloroethane and methylene chloride or methylene chloride and trichlorethylene. The trichlorethylene or methylene chloride component comprises about 0.1 to 90 volume percent of the total degreasing solvent, while the other component of the blend comprises the remainder of the solvent blend The resulting vapor degreasing solvent, has a number of advantages over perchlorethylene alone or 1, 1, 1 trichloroethane alone, or in combination with stabilizers, or trichlorethylene alone, or in combination with stabilizers Addition of either trichlorethylene or methylene chloride to the solvent blends of the invention extends the normal life of the degreasing solvents alone, or in combination with conventional stabilizers and the like. The degreasing solvent blend of the invention not only extends the operational life of perchlorethylene of 1, 1, 1 trichloroethane or trichlorethylene based vapor degreasing solvents, but also reduces the cost of conducting vapor degreasing operations using the conventional vapor degreasing solvents, because initial operational temperatures, for effective vapor degreasing, are reduced The unique solvent blends used in the method of the invention evidence unique results when used in a vapor degreasing process wherein one of the components of each of the novel blends is found to stabilize the other components of the blend in the presence of contaminants encountered in the conventional vapor degreasing process. Governmental code regulations and temperature parameters, under which the degreasing operation are conducted will dictate solvent blends used for results desired.</p> |
