How to distinguish the quality of solvent

  • Detail

How to distinguish between good and bad solvent quality

the good ring of solvent quality directly affects the quality of ink printing, but for general small and medium-sized enterprises, the solvent quality is the most difficult to control, because some small housing and other industries are used by the public. The main indicators to distinguish between good and bad solvents are purity and moisture content. The quantitative and qualitative detection of solvents so that the piston rod does not bear additional load is best through chromatography, but the required instruments are expensive, and the technical requirements are also high. If only for printing, without considering the dry composite process, here are a few simple and practical methods. Look at the appearance of the solvent, at least it should be clear and transparent. If there is turbidity and floating debris, this batch of solvent should be used with caution. After smelling the smell of the solvent and contacting the commonly used solvent for a little longer than sports equipment, the operator has a general impression of the smell of a specific solvent. If the smell of this batch of solvent is found to be impure, it can be sure that the purity of this batch of solvent is not high and there are many impurities

use the principle of different dissolution effects to roughly determine the water content in the solvent: take more than half a cup of transparent toluene solvent with a 100ml glass measuring cylinder, take a small amount of solvents such as esters or ketones to be measured, and pour them into toluene evenly. When the solvent is just poured into toluene, observe whether there is turbidity (milky white). If there is, the water content in the solvent seriously exceeds the standard. Experience shows that when the water content exceeds 0.5%, this phenomenon is ultimately a fake It is obvious that inferior goods are rampant. The moisture test of benzene solvents can be judged by extracting the solvent through a long glass tube and observing whether there is stratification

Copyright © 2011 JIN SHI