GB/T 30787-2014Binder resin applied in digital printing materials - The determination average molecular weight and its distribution - gel permeation chromatography (English PDF)

1 Scope

This standard specifies the use of gel permeation chromatography using digital printing materials and film-forming resin molecular weight distribution methods.

This standard applies to the phenol, cresol, phenol or one of the two or three mixed phenol and formaldehyde reaction of the film-forming resin. Applicable

The average weight average molecular weight in the range of 2000 to 40,000, a molecular weight of 500 to 5000 data, the distribution coefficient of 4.0 to 8.0.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 3723 Sampling of chemical products for industrial use General Safety

GB/T 6679 General rules for sampling solid chemical products

GB/T 8170 repair value expressed about the rules and limit values and judgment

GB/T 21863-2008 gel permeation chromatography (GPC) with tetrahydrofuran do eluent

3 Terms and Definitions

Terms and definitions GB/T 21863-2008 defined in 3.1 are applicable to this document.

4 principle of the method

Gel permeation chromatography is the use of polymer molecules through the porous filler is filled with a special column, the column according to the molecular scale

Inch size separation, molecular volume (molecular weight) to a large outflow small due to the long residence time in the column effluent and then, the effluent

After detection, and automatic recording parameters such as molecular weight and molecular weight distribution of the sample to obtain a GPC chromatogram. The root of this spectrum

According to the standard curve using standard polystyrene samples of known molecular weights obtained, calculated relative molecular weight and molecular weight distribution of the sample

And other data.

5 Sampling

Sampling methods to perform according to the provisions GB/T 6679 and GB/T 3723's.

6 Reagents

Former tetrahydrofuran, HPLC grade, need to use degassed.

Benzene, AR.

Narrow distribution polystyrene standards, distribution coefficient D<=1.10.