GB/T 41671-2022Man-made fibers—Determination of solvent residues content (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.

1 Scope

This document describes the determination of the residues of 7 kinds of organic solvents (see Appendix A) and 2 kinds of inorganic solvents (sodium thiocyanate, concentrated sulfuric acid) in chemical fibers try method.

This document applies to some solution spinning chemical fibers, including spandex, acrylic, polyimide, meta-aramid, polyvinyl alcohol, super High molecular weight polyethylene fiber, lyocell fiber, polyacrylonitrile-based carbon fiber precursor, para-aramid. Other solution-spun chemical fibers can be found in according to use.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 4146 (all parts) Textile chemical fibers

GB/T 6682 Analysis Laboratory Water Specifications and Experimental Methods

JJG 178-2007 Verification Regulations for Ultraviolet, Visible and Near Infrared Spectrophotometers

3 Terms and Definitions

The terms and definitions defined in GB/T 4146 (all parts) and the following terms and definitions apply to this document.

4 General requirements

Gas chromatography-mass spectrometry (GC-MS) for N,N-dimethylacetamide (DMAC), N,N-dimethylformamide (DMF), N-methylacetamide Determination of residual amounts of pyrrolidone (NMP), dimethyl sulfoxide (DMSO), decalin and tetrahydronaphthalene. Determination of decalin residues can also be used by headspace gas chromatography. Headspace gas chromatography is carried out in accordance with the provisions of Appendix B.

High performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) for organic solvent N-methylmorpholine-N-oxide (NMMO) and its fractions Determination of residual amount of hydrolyzed products N-methylmorpholine (NMM), N-nitrosomorpholine (NNM) and morpholine (MOR).

Spectrophotometry is suitable for the determination of residues of dimethylformamide (DMF), dimethylacetamide (DMAC) and dimethyl sulfoxide (DMSO). The determination of the residual amount of N-methylpyrrolidone (NMP) can be used by reference.