GB/T 35859-2018Determination of ethylene glycol monoethyl ether insoluble contents in polymer materials for offset printing plates—Filtering method (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard stipulates the principle, apparatus and reagents for the method of determining the content of ethylene glycol monoethyl ether insolubles in the offset polymer plate by filtration. Test procedures, calculations and results presentation, and safety precautions.

This standard applies to the determination of the content of insolubles in various ethylene glycol monoethyl ether-soluble polymers used in offset printing plates.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 3723 General rules for sampling safety of industrial chemical products

GB/T 8170 Representation and Determination of Numerical Rounding Rules and Limit Values

3 Methodology

The polymer sample to be tested was fully dissolved in ethylene glycol monoethyl ether, and then filtered with a solvent filter. The pore size of the filter was 0.45 µm.

After the oil-soluble filter membrane is fully washed insoluble, the insoluble filter is vacuum-dried to a constant mass, and the filtration membrane before and after filtration is weighed.

The mass changes to calculate the content of insolubles in the polymer.

4 Instruments and reagents

4.1 Solvent filters (schematics) See Appendix A.

4.2 Oil-soluble filter membrane. 0.45 µm pore size.

4.3 Glass vacuum dryer.

4.4 Vacuum pump. Vacuum degree is not less than 0.1MPa.

4.5 Electronic Balance. Accuracy 0.1mg.

4.6 Electromagnetic stirrer.

4.7 Ethylene glycol monoethyl ether, analytical grade.

5 Test steps