Determinating the epoxy value of plasticizers
1 Scope
Method A of this standard is applicable to the determination of epoxy value of epoxy plasticizer, and method B is applicable to the determination of epoxy value of epoxy plasticizer which does not completely react with acetone-hydrochloride solution at room temperature.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding correction of error) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this national standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 603 Chemical reagent Preparations of reagent solutions for use in test methods(GB/T 603-2002, ISO 6353-1: 1982, NEQ)
GB/T 6682 Water for analytical laboratory use-Specification and test methods(GB/T 6682-2008, ISO 3696, 1987, MOD)
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
epoxy value
the oxygen content in the ethylene oxide group in every 100 g sample.
4 Reagents and solutions
Unless otherwise stated, only three-level water in GB/T 6682 or equivalent purity shall be used in the analysis. Unless otherwise specified, he standard titration solutions, preparations and products used in the analysis shall be prepared according to GB/T 601 and GB/T 603.
4.1 Hydrochloric acid [7647-01-0].
4.2 Acetone [67-64-1].
4.3 Pyridine [110-86-1].
4.4 95% ethanol [64-17-5].
4.5 pyridine hydrochloride solution: Take 16 mL hydrochloric acid and 984 mL pyridine, mix well and seal for later use.
4.6 acetone-hydrochloride solution: The volume ratio of hydrochloric acid and acetone is 1:40, and it is stored in a glass bottle for standby.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Reagents and solutions
5 Instruments
6 Analysis Steps
7 Result calculation
8 Admissible error
