In organic chemistry, amine value is a measure of the nitrogen content of an organic molecule.1 Specifically, it is usually used to measure the amine content of amine functional compounds.2 It may be defined as the number of milligrams of potassium hydroxide (KOH) needed to neutralize all amine groups in 1g sample
List of ASTM methods
There are a number of ASTM analytical test methods to determine amine value. A number of states in the United States have adopted their own test methods but they are based on ASTM methods.3 Although there are similarities with the method it is not the same as an acid value.
- ASTM D2073 - This is a potentiometric method.4
- ASTM D2074-07
- ASTM D2896 - potentiometric method with perchloric acid.5
- ASTM D6979-03
First principles
The amine value is useful in helping determine the correct stoichiometry of a two component amine cure epoxy resin system.678
It is the number of Nitrogens x 56.1 (Mwt of KOH) x 1000 (convert to milligrams) divided by molecular mass of the amine functional compound. So using Tetraethylenepentamine (TEPA) as an example: Mwt = 189, number of nitrogen atoms = 5
So 5 x 1000 x 56.1/189 = 1484. So the Amine Value of TEPA = 1484
Other amines
All numbers are in units of mg KOH/g.
- Ethylenediamine. Amine value = 1870
- Diethylenetriamine. Amine value = 1634
- Triethylenetetramine. Amine value = 1537
- Aminoethylpiperazine. Amine value = 1305
- Isophorone diamine. Amine value = 660
- Hexamethylenediamine. Amine value = 967
- 1,2-Diaminocyclohexane. Amine value = 984
- 1,3-BAC. Amine value = 790
- 2-Methylpentamethylenediamine -Dytek A. Amine value = 967
- m-Xylylenediamine -MXDA. Amine value = 825
See also-related test methods
- Acid value
- Bromine number
- Epoxy value
- Hydroxyl value
- Iodine value
- Peroxide value
- Saponification value
References
References
- Howarth, G.A (1995). "5". In Karsa, D.R; Davies, W.D (eds.). Waterborne Maintenance Systems for Concrete and Metal Structures. Vol. 165. Cambridge, U.K: The Royal Society of Chemistry. ISBN 0-85404-740-9.
- Howarth, GA. Master of Science thesis "The synthesis of a legislation compliant corrosion protection paint system, based on waterborne epoxy, urethane and oxazolidine technology". April 1997 Imperial College London Chapter 1.9.5 page 29
- "DETERMINING EPOXIDE EQUIVALENT AND AMINE VALUE OF RESINS" (PDF). Texas.gov.
- "ASTM D2073 - Standard Test Methods for Total, Primary, Secondary, and Tertiary Amine Values of Fatty Amines, Amidoamines, and Diamines by Referee Potentiometric Method | Engineering360". standards.globalspec.com. Retrieved 2021-07-22.
- "Epikure 3378 Technical Data Sheet" (PDF). Peninsula Polymers.
- Jackson, M. A (October 1990). "Guidelines to formulation of waterborne epoxy primers". PPCJ Polymers, Paint and Colour Journal. 180: 608–617 – via DMG Events.
- Howarth, Graham (1995-01-01). "The use of water-based epoxies for anti-corrosive primers". Pigment & Resin Technology. 24 (6): 3–6. doi:10.1108/eb043156. ISSN 0369-9420.
- Howarth, GA. Master of Science thesis "The synthesis of a legislation compliant corrosion protection paint system, based on waterborne epoxy, urethane and oxazolidine technology". April 1997 Imperial College London Chapter 3.2.3 Amine stoichiometry page 56
Further reading
Further reading
- Epoxy resin technology. Paul F. Bruins, Polytechnic Institute of Brooklyn. New York: Interscience Publishers. 1968. ISBN 0-470-11390-1. OCLC 182890.
{{cite book}}: CS1 maint: others (link) - Flick, Ernest W. (1993). Epoxy resins, curing agents, compounds, and modifiers : an industrial guide. Park Ridge, NJ. ISBN 978-0-8155-1708-5. OCLC 915134542.
{{cite book}}: CS1 maint: location missing publisher (link) - Lee, Henry (1967). Handbook of epoxy resins. Kris Neville ([2nd, expanded work] ed.). New York: McGraw-Hill. ISBN 0-07-036997-6. OCLC 311631322.