GB/T 6504-2017Man-made fiber—Test method for oil content (English PDF)

5.1 Method A - Extraction Method (arbitration test method)

5.1.1 General

When the extractant or extraction method is not suitable for a certain fiber or certain type of oiling agent, the test procedure shall be modified. Any modification shall be stated in the test report.

5.1.2 Principle

Since the oiling agent can be dissolved in a specific organic solvent, use the fat extractor to extract oiling agent from the specimen of organic solvent; vaporize the solvent; weigh the mass of residual oiling agent and mass of fiber after treatment, then calculate the oil content of the specimen.

5.1.3 Reagents and materials

5.1.4 Apparatus

The apparatus used in this method is as follows. […]

5.1.5 Specimen preparation

Take 2 specimens, take about 5g of staple fiber for each specimen, accurate to 0.01g; the filaments are wound together to ensure that each package is taken and evenly cut. take about 7g of pre-oriented yarns and draw yarns, accurate to 0.01g; take about 4g of textured yarn, accurate to 0.01g.

5.1.6 Test procedures

5.1.7 Result calculation

The oil content of the specimen shall be calculated as per Formula (1).

5.2 Method B - neutral soap solution washing method

5.2.1 Scope

This Method is applicable to the determination of oil content for filament of man-made fiber. It is not applicable to the chinlon 6 filament, and spandex filament.

5.2.2 Principle

Use the affinity nature between the soap solution and oiling agent, under the role of washing power, the oiling agent on the specimen shall be transferred to the soap solution. Calculate the oil content according to the mass change before and after the specimen washing.

5.2.5 Specimen preparation

The same as 5.1.5.

5.2.6 Test procedures

5.2.6.1 Determination of specimen mass before treatment

Place the specimen into the specimen bag; weigh the mass of specimen bag (containing the specimen); subtract the known washing and drying mass of the specimen bag; the obtain the mass m1 of each specimen before washing, accurate to 0.1mg.

5.2.6.2 Washing

5.3 Optical refractive index method

Appendix A specifies the optical refractive index method.

5.4 Nuclear magnetic resonance method

Appendix B specifies the nuclear magnetic resonance method.

5.5 Rapid extrusion method

Appendix C specifies the rapid extrusion method.