GB/T 25277-2010Plastics -- Determination of phenolic antioxidants and erucamide slip additives in polypropylene homopolymer formulations -- Liquid chromatography (LC) (English PDF)

Foreword

This standard modifies and adopts American Society for Testing and Materials

ASTM D6042-2004 "Standard test method for determination of phenolic

antioxidants and erucamide slip additives in polypropylene homopolymer

formulations using liquid chromatography" (English version).

This standard is redrafted in accordance with ASTM D6042-2004. In Appendix

A, it lists the detailed comparison between the clause numbers of this standard

and ASTM D6042-2004. In Appendix B, it provides the technical differences and

their causes for reference.

For ease of use, this standard is subjected to the following editorial changes.

- ADD the foreword to the national standard;

- MODIFY the "Normative references".

Appendix A, Appendix B and Appendix C of this standard are informative.

This standard was proposed by China Petroleum & Chemical Corporation.

This standard shall be under the jurisdiction of the National Plastics

Standardization Technical Committee Petrochemical Plastic Resin Products

Branch (SAC/TC 15/SC 1).

The responsible drafting organization of this standard. China Petroleum &

Chemical Corporation Beijing Yanshan Branch Resin Application Research

Institute.

The participating drafting organization of this standard. Beijing Institute of

Additives.

1 Scope

This standard specifies the use of liquid chromatography for the determination

of some commonly used additives in polypropylene homopolymer (PP-H).

These additives are subjected to reflux extraction by the mixed solvent of

dichloromethane/cyclohexane AND separation by liquid chromatography. The

UV absorption is measured at 200 nm AND it is quantified by internal standard

method.

This standard applies to the determination of the contents of phenolic

antioxidants and erucamide slip additives in polypropylene homopolymer

formulations. alpha-tocopherol or 3,4-dihydro-2,5,7,8-tetramethyl-2-(4,8,12-

trimethyl tridecyl)-2H-1-benzofuran-6-phenolic hydroxyl group (hereinafter

referred to as vitamin E), 3 (2,4-di-tert-butylphenyl) phosphite ester (hereinafter

referred to as antioxidant 168), tris-(3,5-di-tert-butyl-4-hydroxyphenyl)

isocyanurate (hereinafter referred to as antioxidant 3114), tetra-[(3,5-di-tert-

butyl-4-hydroxyphenyl) propionic acid] pentaerythrilol ester (hereinafter

referred to as antioxidant 1010), AND the (3,5-di-tert-butyl-4-hydroxyphenyl)

propionate octadecyl alcohol (hereinafter referred to as antioxidant 1076). This

standard can also be used for the detection of other antioxidants, such as

antioxidant Ultranox 626, antioxidant Ethanox 330, antioxidant Santanox R and

antioxidant BHT; however, its applicability to these antioxidants has not been

studied.

Under the best detection conditions, the detection limit of phenolic antioxidant

can reach 2 mg/kg.

Note. Other methods that can effectively extract additives from plastics include

thin film extraction method, microwave extraction method, ultrasonic extraction

method, and supercritical fluid extraction method. Other effective methods for

separating the additives include supercritical fluid chromatography (SFC) and

capillary gas chromatography (GC).

2 Normative references

The provisions in following documents become the provisions of this Standard

through reference in this Standard. For the dated references, the subsequent

amendments (excluding corrections) or revisions do not apply to this Standard;

however, parties who reach an agreement based on this Standard are

encouraged to study if the latest versions of these documents are applicable.

For undated references, the latest edition of the referenced document applies.

5 Reagents and materials

6 Instruments

425 µm (40 mesh) particles. During grinding, the grinding time is minimized to

avoid thermal degradation of the additives in the polymer.